You searched for subject:(additive).
Showing records 1 – 30 of
2210 total matches.
◁ [1] [2] [3] [4] [5] … [74] ▶
McMaster University
1.
Shortt, Alexander.
Temperature Monitoring in Selective Laser Melting of Inconel 625.
Degree: MASc, 2020, McMaster University
URL: http://hdl.handle.net/11375/25808 
► The objective of this research was to develop a system to effectively monitor temperature in the selective laser melting of Inconel 625. This study established…
(more)
▼ The objective of this research was to develop a system to effectively monitor temperature in the selective laser melting of Inconel 625. This study established a monitoring system that collects temperature data and describes its relationship with process parameters, develops a control simulation based on the obtained results and determines how to change input parameters in situ. Such research was driven by the unreliability of additively manufactured components, which often contain internal voids and cracks as well as display poor surface finish. With the need for improved part quality, a temperature monitoring system, a promising method of solving several quality issues, proves necessary.
This monitoring system was developed using a pyrometer and a thermal imager mounted on a powder bed metal printer to record the peak temperature of the melt pool. Experiments found that both laser power and scan speed affect the peak melt pool temperature of Inconel 625: as the peak melt pool increases as power increases and as scan speed decreases. A subset of experiments run with a thermal camera further revealed that there is no discernible temperature trend across the laser track, meaning that there was no significant difference in temperature at the start, middle or end of the track. The thermal camera also revealed that temperature across the melt pool resembled a second order response to laser input. Furthermore, according to preliminary offline measurements taken of the primary dendrite arm spacing (PDAS) of Inconel 625 coupons, PDAS increases with peak temperature. In addition to implementing and testing the monitoring system, this research created and simulated a first order model of the system using a discreet proportional integral derivative controller. Lastly, two separate methods were found to interface a controller with the Omnisint 160 in order to change the laser power based on the temperature feedback
Thesis
Master of Applied Science (MASc)
Advisors/Committee Members: Elbestawi, Mo, Mechanical Engineering.
Subjects/Keywords: Additive Manufacturing
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Shortt, A. (2020). Temperature Monitoring in Selective Laser Melting of Inconel 625. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/25808
Chicago Manual of Style (16th Edition):
Shortt, Alexander. “Temperature Monitoring in Selective Laser Melting of Inconel 625.” 2020. Masters Thesis, McMaster University. Accessed March 06, 2021.
http://hdl.handle.net/11375/25808.
MLA Handbook (7th Edition):
Shortt, Alexander. “Temperature Monitoring in Selective Laser Melting of Inconel 625.” 2020. Web. 06 Mar 2021.
Vancouver:
Shortt A. Temperature Monitoring in Selective Laser Melting of Inconel 625. [Internet] [Masters thesis]. McMaster University; 2020. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/11375/25808.
Council of Science Editors:
Shortt A. Temperature Monitoring in Selective Laser Melting of Inconel 625. [Masters Thesis]. McMaster University; 2020. Available from: http://hdl.handle.net/11375/25808
Rutgers University
2.
Scheinerman, Daniel, 1986-.
Several problems in linear algebraic and additive combinatorics.
Degree: PhD, Mathematics, 2019, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/61005/
► This thesis studies three problems in linear algebraic and additive combinatorics. Our first result gives new upper bounds for the determinant of an nimes n…
(more)
▼ This thesis studies three problems in linear algebraic and additive combinatorics.
Our first result gives new upper bounds for the determinant of an nimes n zero-one matrix containing kn ones. Our results improve upon a result of Ryser for k=o(n1/3). For fixed kge 3 it was an open question~cite{bruhn} whether Hadamard's inequality could be exponentially improved. We answer this in the affirmative. Our approach revolves around studying mimes n matrices whose rows sum to k and bounding their Gram determinants. For the class of nimes n matrices whose rows sum to k we show that Ryser's result can be improved for kle sqrt{n/10}. Our technique also allows us to give upper bounds when these matrices are perturbed.
Our second result concerns a question in additive combinatorics. For a prime p>2, we say a nonempty set Asubseteq Fp is emph{unique sum free} (USF) if every element of the sumset A+A can be written as a sum of two elements from A in at least two different ways. That is for any s in A+A there exist a,b,c,d with {a,b}e{c,d} such that s=a+b=c+d. If μ(p) is the size of the smallest USF set in Fp it is straightforward to show that μ(p) = O(sqrt{p}). Kopparty~cite{koppartyconference} conjectured that μ(p)=Theta(sqrt{p}). However, we show constructively that μ(p)=O(log2 p).
Our third result concerns a graph theoretic problem on the Hamming cube, Qn. For a graph, G, we say a proper k-coloring of G is a fall k-coloring if each vertex is adjacent to a vertex in each of the k-1 other color classes. A result of Laskar and Lyle~cite{laskar} shows that for ke 3 and n sufficiently large Qn has a fall k-coloring. It is natural to identify the Hamming cube, Qn, with the vector space F2n. In this context we may seek fall k-colorings of F2n in which each color class is an affine subspace. Our main result is that for even k and n sufficiently large there exist affine fall k-colorings of F2n. In particular, we show these exist for the same range of values of n as in the construction of Laskar and Lyle.
Advisors/Committee Members: Kopparty, Swastik (chair), Beck, Jozsef (internal member), Narayanan, Bhargav (internal member), Lev, Vsevolod (outside member), School of Graduate Studies.
Subjects/Keywords: Additive combinatorics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Scheinerman, Daniel, 1. (2019). Several problems in linear algebraic and additive combinatorics. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/61005/
Chicago Manual of Style (16th Edition):
Scheinerman, Daniel, 1986-. “Several problems in linear algebraic and additive combinatorics.” 2019. Doctoral Dissertation, Rutgers University. Accessed March 06, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/61005/.
MLA Handbook (7th Edition):
Scheinerman, Daniel, 1986-. “Several problems in linear algebraic and additive combinatorics.” 2019. Web. 06 Mar 2021.
Vancouver:
Scheinerman, Daniel 1. Several problems in linear algebraic and additive combinatorics. [Internet] [Doctoral dissertation]. Rutgers University; 2019. [cited 2021 Mar 06].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61005/.
Council of Science Editors:
Scheinerman, Daniel 1. Several problems in linear algebraic and additive combinatorics. [Doctoral Dissertation]. Rutgers University; 2019. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61005/
3.
Geoffroy, Laura.
Design of new fire protective multi-materials : Nouveaux multi-matériaux de protection contre le feu.
Degree: Docteur es, Chimie des matériaux, 2020, Université Lille I – Sciences et Technologies
URL: http://www.theses.fr/2020LIL1R014
► Le feu peut causer de graves dégâts matériels et humains. Par conséquent, il est important de mettre au point de nouvelles protections contre le feu.…
(more)
▼ Le feu peut causer de graves dégâts matériels et humains. Par conséquent, il est important de mettre au point de nouvelles protections contre le feu. Pour concevoir de nouveaux systèmes toujours plus efficaces, une approche scientifique innovante a été envisagée au sein de cette thèse. Elle consiste à combiner différents concepts et matériaux, tout en jouant sur leur design plutôt que leur formulation pour atteindre de meilleures propriétés de protection thermique. Ainsi, deux nouveaux multi-matériaux de protection contre le feu ont été élaborés, visant dans un cas à limiter la réaction au feu, et dans l’autre cas à augmenter la résistance au feu d’un substrat. Dans une première partie, la fabrication additive s’est révélée être un procédé de choix pour concevoir le matériau ayant une faible réaction au feu. Un design à structure sandwich original inspiré du vivant (nid d’abeille) a été conçu, imprimé en 3D, et optimisé par la combinaison de nombreux concepts (système inhibiteur d’oxygène, barrière physique, revêtement basse émissivité). Grâce à cette association de design et concepts, le multi-matériau, exposé à un flux de chaleur radiatif externe de 50 kW/m2 basé sur la norme ISO 13927 du cône calorimètre, a montré une très faible réaction au feu avec notamment une rapide extinction de flamme et un faible dégagement de chaleur total (inférieur à 10 kW/m2), témoignant de son excellente efficacité. Dans une seconde partie, un système faisant office de barrière thermique a été développé afin de protéger un substrat face à une exposition au feu de 116 kW/m2 (test « burn-through » représentatif du standard aéronautique ISO2685). Cette barrière, combinant les phénomènes d’intumescence et de délamination au sein d’un même design, a permis de réduire considérablement la propagation de la chaleur au sein du système. Le substrat a ainsi été protégé, avec une température en face arrière restant inférieure à 250°C après plus de 15 minutes d’exposition au feu. L’efficacité de ce système optimisé a ensuite été validée sur d’autres substrats. Cette étude prouve que la modification du design de divers matériaux constitue une voie prometteuse pour améliorer la performance des systèmes de protection contre le feu.
Fire can cause severe material damage as well as human casualties. The development of new fire protective systems is thus of prime importance. In order to conceive new and more efficient systems, an innovative scientific approach has been considered within this PhD work. It consists in combining various concepts and materials while changing their design rather than their chemistry to achieve superior fire protection. In this way, two novel fireproofing multi-materials were developed and aimed on the one hand to limit the reaction to fire, and on the other hand to increase the fire resistance of a substrate. In the first part, additive manufacturing was selected as a process of choice for designing a material with a low reaction to fire. An original bio-inspired sandwich design (honeycomb-like structure) was elaborated,…
Advisors/Committee Members: Bourbigot, Serge (thesis director), Jimenez, Maude (thesis director).
Subjects/Keywords: Fabrication additive; 668.9
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Geoffroy, L. (2020). Design of new fire protective multi-materials : Nouveaux multi-matériaux de protection contre le feu. (Doctoral Dissertation). Université Lille I – Sciences et Technologies. Retrieved from http://www.theses.fr/2020LIL1R014
Chicago Manual of Style (16th Edition):
Geoffroy, Laura. “Design of new fire protective multi-materials : Nouveaux multi-matériaux de protection contre le feu.” 2020. Doctoral Dissertation, Université Lille I – Sciences et Technologies. Accessed March 06, 2021.
http://www.theses.fr/2020LIL1R014.
MLA Handbook (7th Edition):
Geoffroy, Laura. “Design of new fire protective multi-materials : Nouveaux multi-matériaux de protection contre le feu.” 2020. Web. 06 Mar 2021.
Vancouver:
Geoffroy L. Design of new fire protective multi-materials : Nouveaux multi-matériaux de protection contre le feu. [Internet] [Doctoral dissertation]. Université Lille I – Sciences et Technologies; 2020. [cited 2021 Mar 06].
Available from: http://www.theses.fr/2020LIL1R014.
Council of Science Editors:
Geoffroy L. Design of new fire protective multi-materials : Nouveaux multi-matériaux de protection contre le feu. [Doctoral Dissertation]. Université Lille I – Sciences et Technologies; 2020. Available from: http://www.theses.fr/2020LIL1R014
Georgia Tech
4.
Silberglied, Chelsea.
Extruder dynamics and control in large scale additive manufacturing.
Degree: MS, Mechanical Engineering, 2018, Georgia Tech
URL: http://hdl.handle.net/1853/62249
► In Large Scale Additive Manufacturing, there are many part defects, such as bulging at corners and improper part seams that arise due to a lack…
(more)
▼ In Large Scale
Additive Manufacturing, there are many part defects, such as bulging at corners and improper part seams that arise due to a lack of information about the extruder. To reduce the number of part defects, it is necessary to understand and control the extruder dynamics. A bead characterization system (BCS) was created to measure the flow rate out of the nozzle. Tests were run to excite the dynamics of the extruder and perform system identification. Models were then created to describe the system and predict the flow rate out of the nozzle. Then a feed forward controller was implemented to maintain a consistent bead geometry, and the results from the controller were evaluated.
Advisors/Committee Members: Kurfess, Thomas (advisor), Saldana, Christopher (committee member), Love, Lonnie (committee member), Blue, Craig (committee member).
Subjects/Keywords: Large scale additive manufacturing; Big area additive manufacturing; Additive
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Silberglied, C. (2018). Extruder dynamics and control in large scale additive manufacturing. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62249
Chicago Manual of Style (16th Edition):
Silberglied, Chelsea. “Extruder dynamics and control in large scale additive manufacturing.” 2018. Masters Thesis, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/62249.
MLA Handbook (7th Edition):
Silberglied, Chelsea. “Extruder dynamics and control in large scale additive manufacturing.” 2018. Web. 06 Mar 2021.
Vancouver:
Silberglied C. Extruder dynamics and control in large scale additive manufacturing. [Internet] [Masters thesis]. Georgia Tech; 2018. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/62249.
Council of Science Editors:
Silberglied C. Extruder dynamics and control in large scale additive manufacturing. [Masters Thesis]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/62249
5.
Takiguchi, Tetsuya.
Hands-free Speech Recognition by HMM Composition in Noisy Reverberant Environments : 雑音と残響のある環境下でのHMM合成によるハンズフリーの音声認識法; ザツオン ト ザンキョウ ノアル カンキョウカ デノ HMM ゴウセイ ニヨル ハンズフリー ノ オンセイ ニンシキホウ.
Degree: Nara Institute of Science and Technology / 奈良先端科学技術大学院大学
URL: http://hdl.handle.net/10061/2168
Subjects/Keywords: additive noise
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Takiguchi, T. (n.d.). Hands-free Speech Recognition by HMM Composition in Noisy Reverberant Environments : 雑音と残響のある環境下でのHMM合成によるハンズフリーの音声認識法; ザツオン ト ザンキョウ ノアル カンキョウカ デノ HMM ゴウセイ ニヨル ハンズフリー ノ オンセイ ニンシキホウ. (Thesis). Nara Institute of Science and Technology / 奈良先端科学技術大学院大学. Retrieved from http://hdl.handle.net/10061/2168
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Takiguchi, Tetsuya. “Hands-free Speech Recognition by HMM Composition in Noisy Reverberant Environments : 雑音と残響のある環境下でのHMM合成によるハンズフリーの音声認識法; ザツオン ト ザンキョウ ノアル カンキョウカ デノ HMM ゴウセイ ニヨル ハンズフリー ノ オンセイ ニンシキホウ.” Thesis, Nara Institute of Science and Technology / 奈良先端科学技術大学院大学. Accessed March 06, 2021.
http://hdl.handle.net/10061/2168.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Takiguchi, Tetsuya. “Hands-free Speech Recognition by HMM Composition in Noisy Reverberant Environments : 雑音と残響のある環境下でのHMM合成によるハンズフリーの音声認識法; ザツオン ト ザンキョウ ノアル カンキョウカ デノ HMM ゴウセイ ニヨル ハンズフリー ノ オンセイ ニンシキホウ.” Web. 06 Mar 2021.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Vancouver:
Takiguchi T. Hands-free Speech Recognition by HMM Composition in Noisy Reverberant Environments : 雑音と残響のある環境下でのHMM合成によるハンズフリーの音声認識法; ザツオン ト ザンキョウ ノアル カンキョウカ デノ HMM ゴウセイ ニヨル ハンズフリー ノ オンセイ ニンシキホウ. [Internet] [Thesis]. Nara Institute of Science and Technology / 奈良先端科学技術大学院大学; [cited 2021 Mar 06].
Available from: http://hdl.handle.net/10061/2168.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.
Council of Science Editors:
Takiguchi T. Hands-free Speech Recognition by HMM Composition in Noisy Reverberant Environments : 雑音と残響のある環境下でのHMM合成によるハンズフリーの音声認識法; ザツオン ト ザンキョウ ノアル カンキョウカ デノ HMM ゴウセイ ニヨル ハンズフリー ノ オンセイ ニンシキホウ. [Thesis]. Nara Institute of Science and Technology / 奈良先端科学技術大学院大学; Available from: http://hdl.handle.net/10061/2168
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.
Carnegie Mellon University
6.
Hinton, Thomas James.
Rapid Prototyping Tissue Models of Mammary Duct Epithelium.
Degree: 2017, Carnegie Mellon University
URL: http://repository.cmu.edu/dissertations/876
► Ductal Carcinoma in Situ (DCIS) does not have a clinically useful indicator of malignancy, and it is often benign, except in 20% of cases. Even…
(more)
▼ Ductal Carcinoma in Situ (DCIS) does not have a clinically useful indicator of malignancy, and it is often benign, except in 20% of cases. Even more important, it has a cure – removal of the affected breast. DCIS patients overwhelmingly elect for invasive therapies to escape that 20% malignant chance. Overtreatment such as this costs the patients, and it highlights the need for a DCIS model capable of distinguishing the 20% in need of treatment. Some labs have taken steps toward three-dimensional, complex, and biomimetic models of mammary tissues using a variety of endogenous and synthetic gels and 3D printing. We developed FRESH (Freeform Reversible Embedding of Suspended Hydrogels) as the first method capable of 3D printing highly biomimetic shapes from endogenous gels. Utilizing FRESH, we aim to rapid prototype models of mammary duct epithelia that are biomimetic, parametric, and capable of iterative evolution. First, we investigate the principles of 3D printers modified for extruding fluids and construct a comprehensive hardware and software platform for printing gelling fluids. Second, we apply the FRESH method to 3D print collagen and alginate hydrogels, demonstrating patency of printed vascular models, topological fidelity, and the synergistic combination of hydrogel properties in multi-material prints. Finally, we rapid prototype an epithelial monolayer by seeding a 3D printed collagen manifold, and we demonstrate maintenance of the tissue’s geometry across a week of culture. We provide evidence of fidelity in prints such as an epithelial tree printed at 200% scale using unmodified collagen type I, and we investigate the combination of hydrogel properties in multi-material prints by utilizing a second hydrogel (alginate) to reinforce and preserve the fidelity of this collagen tree during handling. Our approach utilizes faster (>40 mm/s), cheaper (
Subjects/Keywords: 3d; additive; Bioprinting; fresh; tissue
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hinton, T. J. (2017). Rapid Prototyping Tissue Models of Mammary Duct Epithelium. (Thesis). Carnegie Mellon University. Retrieved from http://repository.cmu.edu/dissertations/876
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hinton, Thomas James. “Rapid Prototyping Tissue Models of Mammary Duct Epithelium.” 2017. Thesis, Carnegie Mellon University. Accessed March 06, 2021.
http://repository.cmu.edu/dissertations/876.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hinton, Thomas James. “Rapid Prototyping Tissue Models of Mammary Duct Epithelium.” 2017. Web. 06 Mar 2021.
Vancouver:
Hinton TJ. Rapid Prototyping Tissue Models of Mammary Duct Epithelium. [Internet] [Thesis]. Carnegie Mellon University; 2017. [cited 2021 Mar 06].
Available from: http://repository.cmu.edu/dissertations/876.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hinton TJ. Rapid Prototyping Tissue Models of Mammary Duct Epithelium. [Thesis]. Carnegie Mellon University; 2017. Available from: http://repository.cmu.edu/dissertations/876
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
UCLA
7.
Kapitonov, Ivan.
Too.
Degree: Linguistics, 2012, UCLA
URL: http://www.escholarship.org/uc/item/3km5k4g1
► This thesis undertakes a new investigation in the semantics of English additive particle too. I discuss various properties of too that have been noticed by…
(more)
▼ This thesis undertakes a new investigation in the semantics of English additive particle too. I discuss various properties of too that have been noticed by scholars in the last four decades, and present some novel data that has not been discussed yet. These data, as we shall see, pose problems for the existing accounts of too. A new analysis is developed here to provide solutions to a range of problems. It is rooted in Rooth's (1992) alternative semantics, following the spirit of Beck's (2006) analysis of again. I treat too as a propositional operator that relates the proposition expressed by the sentence containing it to some contextually salient proposition from a set restricted by the interpretation of focus.
Subjects/Keywords: Linguistics; additive particles; pragmatics; presupposition
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kapitonov, I. (2012). Too. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/3km5k4g1
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kapitonov, Ivan. “Too.” 2012. Thesis, UCLA. Accessed March 06, 2021.
http://www.escholarship.org/uc/item/3km5k4g1.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kapitonov, Ivan. “Too.” 2012. Web. 06 Mar 2021.
Vancouver:
Kapitonov I. Too. [Internet] [Thesis]. UCLA; 2012. [cited 2021 Mar 06].
Available from: http://www.escholarship.org/uc/item/3km5k4g1.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kapitonov I. Too. [Thesis]. UCLA; 2012. Available from: http://www.escholarship.org/uc/item/3km5k4g1
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rochester Institute of Technology
8.
Arvelo Rodriguez, Xavier H.
Designing for Sustainable Bicycle Manufacturing.
Degree: MFA, School of Design (CAD), 2019, Rochester Institute of Technology
URL: https://scholarworks.rit.edu/theses/10051
► Currently, with the increase of people moving from one place to another, either to fulfill their daily activities or for recreation, the need has…
(more)
▼ Currently, with the increase of people moving from one place to another, either to fulfill their daily activities or for recreation, the need has been created to produce a greater amount of means of transportation that can facilitate this action. Many people choose to use vehicles that do not help with the reduction of environmental pollution; among these, we can mention cars, buses, motorcycles, etc. The use of bicycles is predominant in countries with a developed culture and infrastructure focused on bike riding. Also, where fuel taxes are higher and people care about pollution in their surroundings.
In this project, a design has been developed that focuses on reducing the resources needed to produce a standard bicycle. Focused on developing a sustainable manufacturing design by utilizing
additive manufacturing technologies and generative design, we not only aim to find a way to generate a product that is more efficient and friendlier to the environment, but also expects to open a door to new manufacturing possibilities.
Advisors/Committee Members: Mindy Magyar.
Subjects/Keywords: Additive; Bicycle; Generative; Manufacturing; Sustainability
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Arvelo Rodriguez, X. H. (2019). Designing for Sustainable Bicycle Manufacturing. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/10051
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Arvelo Rodriguez, Xavier H. “Designing for Sustainable Bicycle Manufacturing.” 2019. Thesis, Rochester Institute of Technology. Accessed March 06, 2021.
https://scholarworks.rit.edu/theses/10051.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Arvelo Rodriguez, Xavier H. “Designing for Sustainable Bicycle Manufacturing.” 2019. Web. 06 Mar 2021.
Vancouver:
Arvelo Rodriguez XH. Designing for Sustainable Bicycle Manufacturing. [Internet] [Thesis]. Rochester Institute of Technology; 2019. [cited 2021 Mar 06].
Available from: https://scholarworks.rit.edu/theses/10051.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Arvelo Rodriguez XH. Designing for Sustainable Bicycle Manufacturing. [Thesis]. Rochester Institute of Technology; 2019. Available from: https://scholarworks.rit.edu/theses/10051
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
9.
Yang, Fan.
Additive abstraction-based heuristics.
Degree: PhD, Department of Computing Science, 2011, University of Alberta
URL: https://era.library.ualberta.ca/files/fx719m90m
► In this thesis, we study theoretically and empirically the additive abstraction-based heuristics. First we present formal general definitions for abstractions that extend to general additive…
(more)
▼ In this thesis, we study theoretically and empirically
the additive abstraction-based heuristics. First we present formal
general definitions for abstractions that extend to general
additive abstractions. We show that the general definition makes
proofs of admissibility, consistency, and additivity easier, by
proving that several previous methods for defining abstractions and
additivity satisfy three imple conditions. Then we investigate two
general methods for defining additive abstractions and run
experiments to determine the effectiveness of these methods for two
benchmark state spaces: TopSpin and the Pancake puzzle. Third, we
propose that the accuracy of the heuristics generated by
abstraction can be improved by checking for infeasibility. The
theory and experiments demonstrate the approach to detect
infeasibility and the application of this technique to different
domains. Finally, we explore the applications of additive
abstraction-based heuristics in two state spaces with nonuniform
edge costs: the Sequential Ordering Problem (SOP) and the weighted
Pancake puzzle. We formalize a novel way of generating additive and
non-additive heuristics for these state spaces. Furthermore, we
investigate the key concepts to generate good additive and
non-additive abstractions. Experiments show that compared to some
simple alternative heuristics, well chosen abstractions can enhance
the quality of suboptimal solutions for large SOP instances and
reduce search time for the weighted Pancake problems.
Subjects/Keywords: heuristic search; additive; heuristics; abstraction
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yang, F. (2011). Additive abstraction-based heuristics. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/fx719m90m
Chicago Manual of Style (16th Edition):
Yang, Fan. “Additive abstraction-based heuristics.” 2011. Doctoral Dissertation, University of Alberta. Accessed March 06, 2021.
https://era.library.ualberta.ca/files/fx719m90m.
MLA Handbook (7th Edition):
Yang, Fan. “Additive abstraction-based heuristics.” 2011. Web. 06 Mar 2021.
Vancouver:
Yang F. Additive abstraction-based heuristics. [Internet] [Doctoral dissertation]. University of Alberta; 2011. [cited 2021 Mar 06].
Available from: https://era.library.ualberta.ca/files/fx719m90m.
Council of Science Editors:
Yang F. Additive abstraction-based heuristics. [Doctoral Dissertation]. University of Alberta; 2011. Available from: https://era.library.ualberta.ca/files/fx719m90m
Oregon State University
10.
Wang, Lu.
Nonparametric Estimation of Additive Models with Shape Constraints.
Degree: PhD, Statistics, 2016, Oregon State University
URL: http://hdl.handle.net/1957/59111
► Monotone additive models are useful in estimating productivity curves or analyzing disease risk where the predictors are known to have monotonic effects on the response.…
(more)
▼ Monotone
additive models are useful in estimating productivity curves or analyzing disease risk where the predictors are known to have monotonic effects on the response. Existing literature mainly focuses on univariate monotone smoothing. Available methods for the estimation of monotone
additive models are either difficult to interpret or have no asymptotic guarantees. In the first part of this dissertation, we propose a one-step backfitted constrained polynomial spline method for the estimation of monotone
additive models. In our proposed method, we obtain monotone estimators by imposing a set of linear constraints on the spline coefficients for each
additive component. In the second part of the dissertation, we extend the constrained polynomial spline method to estimate the production frontier that is used to quantify the maximum production output in econometrics. The estimation of frontier functions is more challenging since it is the boundary of the support rather than the mean output function to be estimated. Here, we develop a two-step shape constrained polynomial spline method for the frontier estimation. The first step is to capture the shape of frontier while the second step is to estimate the location of frontier. Both proposed methods in this dissertation give smooth estimators with the desired shape constraints (monotonicity or/and concavity). They are easily implementable and computationally efficient by taking advantage of linear programming. Most importantly, our methods are applicable for multi-dimensions where some existing methods fail to work. For the assessment of properties of the proposed estimators, asymptotic theory is also developed. In addition, the simulation studies and application of our methods to analyze Norwegian Farm data in both parts suggest that our proposed methods have better numerical performance than the existing methods, especially when the data has outliers.
Advisors/Committee Members: Xue, Lan (advisor), Lesser, Virginia (committee member).
Subjects/Keywords: Additive model; Nonparametric statistics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wang, L. (2016). Nonparametric Estimation of Additive Models with Shape Constraints. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/59111
Chicago Manual of Style (16th Edition):
Wang, Lu. “Nonparametric Estimation of Additive Models with Shape Constraints.” 2016. Doctoral Dissertation, Oregon State University. Accessed March 06, 2021.
http://hdl.handle.net/1957/59111.
MLA Handbook (7th Edition):
Wang, Lu. “Nonparametric Estimation of Additive Models with Shape Constraints.” 2016. Web. 06 Mar 2021.
Vancouver:
Wang L. Nonparametric Estimation of Additive Models with Shape Constraints. [Internet] [Doctoral dissertation]. Oregon State University; 2016. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1957/59111.
Council of Science Editors:
Wang L. Nonparametric Estimation of Additive Models with Shape Constraints. [Doctoral Dissertation]. Oregon State University; 2016. Available from: http://hdl.handle.net/1957/59111
Oregon State University
11.
Malshe, Harsha A.
A Techno-Economic Assessment Methodology for Advanced Additive and Joining Processes.
Degree: MS, Industrial Engineering, 2016, Oregon State University
URL: http://hdl.handle.net/1957/59865
► Integrated manufacturing systems, a combination of subtractive, additive, and joining processes, provide a competitive advantage for manufacturing organizations. As product designs become more complex and…
(more)
▼ Integrated manufacturing systems, a combination of subtractive,
additive, and joining processes, provide a competitive advantage for manufacturing organizations. As product designs become more complex and capital more scarce, an ideal combination of advanced manufacturing technologies (e.g., powder bed fusion or friction welding), in tandem with traditional subtractive manufacturing systems, can optimize the production of high-value products. However, adoption of advanced
additive and joining processes (AAJPs) on a large-scale has been obstructed by technical and economic barriers. Techno-economic analysis is a tool that can help justify the large-scale implementation of integrated manufacturing systems, and realization of potential cost and performance efficiencies. Consequently, a methodology has been developed to understand the impacts of competing manufacturing decisions for AAJPs. The approach has been further developed and applied to a case study for aerospace applications. Major contributions include development of integrated process selection algorithms and cost analysis models. Results demonstrate the feasibility of this strategy to evaluate competing advanced manufacturing technologies.
Advisors/Committee Members: Haapala, Karl R. (advisor), Campbell, Matthew I. (committee member).
Subjects/Keywords: Additive manufacturing; Manufacturing processes
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Malshe, H. A. (2016). A Techno-Economic Assessment Methodology for Advanced Additive and Joining Processes. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/59865
Chicago Manual of Style (16th Edition):
Malshe, Harsha A. “A Techno-Economic Assessment Methodology for Advanced Additive and Joining Processes.” 2016. Masters Thesis, Oregon State University. Accessed March 06, 2021.
http://hdl.handle.net/1957/59865.
MLA Handbook (7th Edition):
Malshe, Harsha A. “A Techno-Economic Assessment Methodology for Advanced Additive and Joining Processes.” 2016. Web. 06 Mar 2021.
Vancouver:
Malshe HA. A Techno-Economic Assessment Methodology for Advanced Additive and Joining Processes. [Internet] [Masters thesis]. Oregon State University; 2016. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1957/59865.
Council of Science Editors:
Malshe HA. A Techno-Economic Assessment Methodology for Advanced Additive and Joining Processes. [Masters Thesis]. Oregon State University; 2016. Available from: http://hdl.handle.net/1957/59865
Cornell University
12.
Maccurdy, Robert.
Multicellular Machines: A Bio-Inspired Approach To Electromechanical Design And Fabrication.
Degree: PhD, Mechanical Engineering, 2015, Cornell University
URL: http://hdl.handle.net/1813/40702
► Multi-cellular organisms have exploited a simple but powerful design concept: the regular tiling of a relatively small number of individual cell types yields assemblies with…
(more)
▼ Multi-cellular organisms have exploited a simple but powerful design concept: the regular tiling of a relatively small number of individual cell types yields assemblies with spectacular functional capacity. This capability comes at the cost of substantial complexity in design synthesis and assembly, which nature has addressed via developmental processes and evolutionary search. I will describe my application of these ideas to electromechanical systems, which has led to the development of various electromechanical cell types, assembly strategies, and design synthesis tools inspired by lessons from Ecology and Evolutionary Biology.
Advisors/Committee Members: Lipson,Hod (chair), Manohar,Rajit (committee member), Winkler,David Ward (committee member).
Subjects/Keywords: robotics; additive manufacturing; digital materials
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Maccurdy, R. (2015). Multicellular Machines: A Bio-Inspired Approach To Electromechanical Design And Fabrication. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/40702
Chicago Manual of Style (16th Edition):
Maccurdy, Robert. “Multicellular Machines: A Bio-Inspired Approach To Electromechanical Design And Fabrication.” 2015. Doctoral Dissertation, Cornell University. Accessed March 06, 2021.
http://hdl.handle.net/1813/40702.
MLA Handbook (7th Edition):
Maccurdy, Robert. “Multicellular Machines: A Bio-Inspired Approach To Electromechanical Design And Fabrication.” 2015. Web. 06 Mar 2021.
Vancouver:
Maccurdy R. Multicellular Machines: A Bio-Inspired Approach To Electromechanical Design And Fabrication. [Internet] [Doctoral dissertation]. Cornell University; 2015. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1813/40702.
Council of Science Editors:
Maccurdy R. Multicellular Machines: A Bio-Inspired Approach To Electromechanical Design And Fabrication. [Doctoral Dissertation]. Cornell University; 2015. Available from: http://hdl.handle.net/1813/40702
Vanderbilt University
13.
Neely, Kelsay Elizabeth.
Formulation of a Reactive Material Paste for Additive Manufacturing.
Degree: MS, Mechanical Engineering, 2017, Vanderbilt University
URL: http://hdl.handle.net/1803/11249
► The reaction generated by the ignition of energetic materials is usually solely tuned by chemical composition. With advances in 3D printing technology, the reaction can…
(more)
▼ The reaction generated by the ignition of energetic materials is usually solely tuned by chemical composition. With advances in 3D printing technology, the reaction can be controlled through the construction of custom geometry known as reactive material architectures. In order to investigate reactive material architectures on the meso-scale, a paste must be created. This thesis details the development and testing of a thermite paste. Samples were tested for completeness of reaction. The successful paste formulation was then 3D printed and ignited. Two conclusions can be drawn from these experiments. Thermite can be successfully suspended in a paste form while preserving the heat generation and ignition properties of powdered thermite, and a thermite paste can be successfully 3D printed at a meso-scale.
Advisors/Committee Members: Kevin Galloway (committee member), George E. Cook (committee member), Alvin M. Strauss (Committee Chair).
Subjects/Keywords: reactive materials; thermite; additive manufacturing
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Neely, K. E. (2017). Formulation of a Reactive Material Paste for Additive Manufacturing. (Thesis). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11249
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Neely, Kelsay Elizabeth. “Formulation of a Reactive Material Paste for Additive Manufacturing.” 2017. Thesis, Vanderbilt University. Accessed March 06, 2021.
http://hdl.handle.net/1803/11249.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Neely, Kelsay Elizabeth. “Formulation of a Reactive Material Paste for Additive Manufacturing.” 2017. Web. 06 Mar 2021.
Vancouver:
Neely KE. Formulation of a Reactive Material Paste for Additive Manufacturing. [Internet] [Thesis]. Vanderbilt University; 2017. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1803/11249.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Neely KE. Formulation of a Reactive Material Paste for Additive Manufacturing. [Thesis]. Vanderbilt University; 2017. Available from: http://hdl.handle.net/1803/11249
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
14.
Evans, Jordan Andrew.
Anisotropic Response of Laser Additively Manufactured Nuclear Alloys to Radiation Damage.
Degree: PhD, Materials Science and Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/169649
► The impact of radiation-induced effects on the properties of alloys fabricated using additive manufacturing (AM) was evaluated through the implementation of ion beam irradiation testing…
(more)
▼ The impact of radiation-induced effects on the properties of alloys fabricated using
additive manufacturing (AM) was evaluated through the implementation of ion beam irradiation testing followed by electron backscatter diffraction (EBSD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), nanoindentation, scanning probe microscopy (SPM), and transmission electron microscopy (TEM). Inconel 600 (I600) and 316L stainless steel (316L) rods were fabricated by Quad City Manufacturing Laboratory in collaboration with Lockheed Martin for this study. The rods were produced in three distinct orientations (vertical, horizontal, and 45°) using laser
additive manufacturing (LAM). Conventionally manufactured I600 and 316L rods were purchased from Metal Samples, Inc. to enable comparative studies. The I600 and 316L LAM specimens were heat treated to 900 °C and 650 °C in argon with no cold working, respectively. Similarly, the conventionally manufactured I600 and 316L control specimens were cold rolled and annealed at 980 °C and 1040 °C in argon with no cold working, respectively.
XRD of unirradiated specimens showed differences in peak ratios between build orientations, indicating anisotropic grain structures for samples fabricated by LAM. All LAM rods contained significantly fewer coincidence site lattice (CSL) boundaries and more residual strain compared to the controls before and after irradiation, regardless of build direction, as determined by EBSD. Material performance parameters such as resistance to radiation-enhanced embrittlement, corrosion, creep, intergranular stress corrosion cracking, and hydrogen-induced cracking were inferred from CSL theory, which suggests that all LAM rods are more susceptible to grain boundary-related failure mechanisms than their conventionally manufactured counterparts. All alloys built by LAM are strongly textured with parallel to the build direction before and after irradiation. Directionally dependent Taylor Factor distributions suggest that resistance to slip depends on build direction where, from highest to lowest resistance: horizontal > 45° > vertical.
All I600 samples experienced radiation-induced segregation which, according to SEM/EDS and SPM studies, resulted in the formation of chromium carbide precipitates on to the irradiated surfaces. Strong anisotropic mechanical behavior was observed in the LAM rods, as measured by nanoindentation and bulk tensile testing. The hardness of the unirradiated as-annealed specimens, from greatest to least, is: horizontal > 45° > vertical. The radiation-induced hardening of LAM specimens, from greatest to least, is: horizontal > 45° > vertical. The orientation dependence of radiation-induced segregation and hardening mechanisms is discussed.
The ultimate outcome of this work is a first-of-a-kind high-dose radiation damage study of alloys fabricated by LAM, revealing that the radiation-induced changes in material properties for these alloys is dependent upon build orientation.
Advisors/Committee Members: McDeavitt, Sean (advisor), Perez-Nunez, Delia (committee member), Shao, Lin (committee member), Shamberger, Patrick (committee member), Tsvetkov, Pavel (committee member).
Subjects/Keywords: additive manufacturing; radiation damage; anisotropy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Evans, J. A. (2017). Anisotropic Response of Laser Additively Manufactured Nuclear Alloys to Radiation Damage. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/169649
Chicago Manual of Style (16th Edition):
Evans, Jordan Andrew. “Anisotropic Response of Laser Additively Manufactured Nuclear Alloys to Radiation Damage.” 2017. Doctoral Dissertation, Texas A&M University. Accessed March 06, 2021.
http://hdl.handle.net/1969.1/169649.
MLA Handbook (7th Edition):
Evans, Jordan Andrew. “Anisotropic Response of Laser Additively Manufactured Nuclear Alloys to Radiation Damage.” 2017. Web. 06 Mar 2021.
Vancouver:
Evans JA. Anisotropic Response of Laser Additively Manufactured Nuclear Alloys to Radiation Damage. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1969.1/169649.
Council of Science Editors:
Evans JA. Anisotropic Response of Laser Additively Manufactured Nuclear Alloys to Radiation Damage. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/169649
Leiden University
15.
Broeren, Freek.
Understanding the Metacube Through 3D Printing.
Degree: 2015, Leiden University
URL: http://hdl.handle.net/1887/37070
► We report the design and construction of a mechanism, consisting of rigid plates and freely hinging connectors, that is used to describe and study the…
(more)
▼ We report the design and construction of a mechanism, consisting
of rigid plates and freely hinging connectors, that is used to
describe and study the motions of a mechanical metamaterial
called the ‘metacube’. For this design, a novel method is used,
where the mechanism is 3D printed and the accuracy is
mechanically tested.
We present an accurate mechanism that describes the motions of
the metacube. This mechanism can be used to not only gain
further understanding of the properties of the metacube, but also
shows previously undiscovered properties of this mechanical
metamaterial.
Advisors/Committee Members: Hecke, Martin van (advisor).
Subjects/Keywords: Additive Manufacturing; Metamaterials; Mechanism; Folding
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Broeren, F. (2015). Understanding the Metacube Through 3D Printing. (Masters Thesis). Leiden University. Retrieved from http://hdl.handle.net/1887/37070
Chicago Manual of Style (16th Edition):
Broeren, Freek. “Understanding the Metacube Through 3D Printing.” 2015. Masters Thesis, Leiden University. Accessed March 06, 2021.
http://hdl.handle.net/1887/37070.
MLA Handbook (7th Edition):
Broeren, Freek. “Understanding the Metacube Through 3D Printing.” 2015. Web. 06 Mar 2021.
Vancouver:
Broeren F. Understanding the Metacube Through 3D Printing. [Internet] [Masters thesis]. Leiden University; 2015. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1887/37070.
Council of Science Editors:
Broeren F. Understanding the Metacube Through 3D Printing. [Masters Thesis]. Leiden University; 2015. Available from: http://hdl.handle.net/1887/37070
Delft University of Technology
16.
Tramontini, Lia (author).
An Additive Manufacturing Solution for Free-Form Steel Curtain Walls.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:33e041e0-b1ae-489e-a01e-a9c4c589b937
► An exploration in the use of rapid manufacturing for the design and fabrication of free-form steel curtain wall systems. Focus on reconciliation of free-form geometry,…
(more)
▼ An exploration in the use of rapid manufacturing for the design and fabrication of free-form steel curtain wall systems. Focus on reconciliation of free-form geometry, system assembly, and digital workflow.
Advisors/Committee Members: Knaack, Ulrich (mentor), Turrin, Michela (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Additive Manufacturing; Facade; Curtain Wall
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Tramontini, L. (. (2018). An Additive Manufacturing Solution for Free-Form Steel Curtain Walls. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:33e041e0-b1ae-489e-a01e-a9c4c589b937
Chicago Manual of Style (16th Edition):
Tramontini, Lia (author). “An Additive Manufacturing Solution for Free-Form Steel Curtain Walls.” 2018. Masters Thesis, Delft University of Technology. Accessed March 06, 2021.
http://resolver.tudelft.nl/uuid:33e041e0-b1ae-489e-a01e-a9c4c589b937.
MLA Handbook (7th Edition):
Tramontini, Lia (author). “An Additive Manufacturing Solution for Free-Form Steel Curtain Walls.” 2018. Web. 06 Mar 2021.
Vancouver:
Tramontini L(. An Additive Manufacturing Solution for Free-Form Steel Curtain Walls. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 06].
Available from: http://resolver.tudelft.nl/uuid:33e041e0-b1ae-489e-a01e-a9c4c589b937.
Council of Science Editors:
Tramontini L(. An Additive Manufacturing Solution for Free-Form Steel Curtain Walls. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:33e041e0-b1ae-489e-a01e-a9c4c589b937
University of Connecticut
17.
Sadowski, Magda D.
Optimizing Quality of Additively Manufactured Inconel 718 Using Powder Bed Laser Melting Process.
Degree: MS, Mechanical Engineering, 2016, University of Connecticut
URL: https://opencommons.uconn.edu/gs_theses/880
► Laser powder bed melting process is an additive manufacturing process that uses laser beam energy to melt metallic powder particles in a powder bed…
(more)
▼ Laser powder bed melting process is an
additive manufacturing process that uses laser beam energy to melt metallic powder particles in a powder bed and form a desired shape. This process is being adapted by aerospace industry, specifically for high strength, high temperature materials such as Inconel and titanium used in high temperature applications such as jet engines. However, there are countless variables that could affect the final quality of the parts including microstructure, defect density and final mechanical strength. Laser power and laser speed have been found to be most important parameters in these processes. In order to examine the microstructure evolution caused by varying these process parameters and ultimately improve parts manufactured in this way, a systematic experiment is designed (DoE) and implemented on the process in which laser power and speed are varied at multiple levels to fabricate line scans of Inconel 718. DoE contained 24 runs of single block specimens, each containing 10 scanned lines. Extensive and systematic microstructural analysis are conducted on these specimens including measurement of melt pool dimensions, a qualitative analysis on line quality, and analysis of grain size and orientations using electron backscatter diffraction analysis to relate the process parameters to the final microstructure. Statistical analysis is conducted to quantitatively relate the results to the main effect of the initial process parameters and detect distinguishable trend.
Advisors/Committee Members: Dr. Mark Aindow, Dr. Bi Zhang, Dr. Vito Moreno, Dr. Leila Ladani.
Subjects/Keywords: Additive Manufacturing; DMLS; Inconel 718
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sadowski, M. D. (2016). Optimizing Quality of Additively Manufactured Inconel 718 Using Powder Bed Laser Melting Process. (Masters Thesis). University of Connecticut. Retrieved from https://opencommons.uconn.edu/gs_theses/880
Chicago Manual of Style (16th Edition):
Sadowski, Magda D. “Optimizing Quality of Additively Manufactured Inconel 718 Using Powder Bed Laser Melting Process.” 2016. Masters Thesis, University of Connecticut. Accessed March 06, 2021.
https://opencommons.uconn.edu/gs_theses/880.
MLA Handbook (7th Edition):
Sadowski, Magda D. “Optimizing Quality of Additively Manufactured Inconel 718 Using Powder Bed Laser Melting Process.” 2016. Web. 06 Mar 2021.
Vancouver:
Sadowski MD. Optimizing Quality of Additively Manufactured Inconel 718 Using Powder Bed Laser Melting Process. [Internet] [Masters thesis]. University of Connecticut; 2016. [cited 2021 Mar 06].
Available from: https://opencommons.uconn.edu/gs_theses/880.
Council of Science Editors:
Sadowski MD. Optimizing Quality of Additively Manufactured Inconel 718 Using Powder Bed Laser Melting Process. [Masters Thesis]. University of Connecticut; 2016. Available from: https://opencommons.uconn.edu/gs_theses/880
University of Bath
18.
Jones, Rhys Owen.
Additive manufacturing of functional engineering components.
Degree: PhD, 2013, University of Bath
URL: https://researchportal.bath.ac.uk/en/studentthesis/additive-manufacturing-of-functional-engineering-components(483cf073-efa3-48be-9423-ea521aa1a7e1).html
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577739
► Additive Manufacturing (AM) is a class of echnologies whereby components are made in an additive, layer-by-layer fashion enabling production of complex parts in which complexity…
(more)
▼ Additive Manufacturing (AM) is a class of echnologies whereby components are made in an additive, layer-by-layer fashion enabling production of complex parts in which complexity has little or no effect on cost. However typical components roduced using these techniques are basic structural items with no major strength requirement and low geometric tolerances made from a single material. his thesis develops a low-cost Fused Filament abrication (FFF) based AM technique to produce functional parts. This is achieved by through esearching and implementing new materials in ombination and using precise control of infill tool paths for existing materials. Robocasting has previously been shown to be extremely versatile, however is known to offer poorer build quality relative to its ess-versatile counterparts. Research was ndertaken to enable Robocasting to be combined with FFF to enable the print quality and practical benefits of FFF with the material flexibility of Robocasting. This resulted in the manufacture of several multiple-material omponents using the technique to demonstrate its potential. In order to minimise the number of materials required to obtain desired properties, the effect of process parameters such as layer height, infill angle, and infill porosity were investigated. In total over an order of agnitude variation in Young’s modulus and tensile strength were achieved, enabling these properties to be actively controlled within the manufactured components. Finally a novel non-eutectic low melting point alloy was developed to be compatible with the FFF process. Its greater viscosity compared to traditional eutectics resulted in improved print quality and the reliable deposition of electrically conductive track 0.57x0.25mm in cross-section. In addition the material is approximately three orders of magnitude more conductive that typical printable organic inks. A micro-controller was produced using the technique in conjunction with traditional electronics components. This represents the first time a functional electrical circuitry, with sufficient conductivity for the majority of applications and interfacing directly with standard electrical components, has been produced using a very low-cost AM technique such as FFF. The research undertaken builds components with substantially improved functionality relative to traditional AM products, enabling electromechanical components with varying mechanical and electrical properties. It is anticipated that this could substantially reduce the part-count for many engineering assemblies and open up Additive Manufacturing to many new applications.
Subjects/Keywords: 621.988; additive manufacturing; circuitry; reprap
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Jones, R. O. (2013). Additive manufacturing of functional engineering components. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/additive-manufacturing-of-functional-engineering-components(483cf073-efa3-48be-9423-ea521aa1a7e1).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577739
Chicago Manual of Style (16th Edition):
Jones, Rhys Owen. “Additive manufacturing of functional engineering components.” 2013. Doctoral Dissertation, University of Bath. Accessed March 06, 2021.
https://researchportal.bath.ac.uk/en/studentthesis/additive-manufacturing-of-functional-engineering-components(483cf073-efa3-48be-9423-ea521aa1a7e1).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577739.
MLA Handbook (7th Edition):
Jones, Rhys Owen. “Additive manufacturing of functional engineering components.” 2013. Web. 06 Mar 2021.
Vancouver:
Jones RO. Additive manufacturing of functional engineering components. [Internet] [Doctoral dissertation]. University of Bath; 2013. [cited 2021 Mar 06].
Available from: https://researchportal.bath.ac.uk/en/studentthesis/additive-manufacturing-of-functional-engineering-components(483cf073-efa3-48be-9423-ea521aa1a7e1).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577739.
Council of Science Editors:
Jones RO. Additive manufacturing of functional engineering components. [Doctoral Dissertation]. University of Bath; 2013. Available from: https://researchportal.bath.ac.uk/en/studentthesis/additive-manufacturing-of-functional-engineering-components(483cf073-efa3-48be-9423-ea521aa1a7e1).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577739
KTH
19.
Cao, Pengcheng.
Characterization of Laser Deposited Alloy 718.
Degree: Materials Science and Engineering, 2016, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182603
► Additive Manufacturing (AM) is a method of producing three-dimensional objects using additive processes. It allows great flexibility in the processes and reduces the design-to-production…
(more)
▼ Additive Manufacturing (AM) is a method of producing three-dimensional objects using additive processes. It allows great flexibility in the processes and reduces the design-to-production time. Laser Metal Deposition (LMD) is one of AM methods under development and is based on the deposition technology. LMD has advantages in grain growth control, material functional grading, lower material storage requirement and more spatial freedom. Considering the outstanding features, it is important to study the characteristics of LMD products, which in this study is Alloy 718 for aerospace applications. Single-wall Laser LMD samples are built with varied process parameters using gas-atomized Alloy 718 powders. Two experiments were carried out with focuses on 1) evaluations and comparisons of the microstructural characteristics, porosity and hardness of the samples are performed; 2) The effect of heat treatments including solution treatment and aging on the microstructure as well as the hardness. The results of the experiments revealed directional solidification features and typical phases such as γ matrix, Laves phase and carbide. 0.06% average porosity and a majority of < 20 µm size are measured from the LMD samples. Only spherical gaseous pores are found while no lack-of-fusion pore is found. A hardness Vickers of 246 in average hardness is measured from the LMD samples. In the heat treated samples, δ phases were found; By direct-aging at 750 ℃ for 10 to 15 hours, the samples reach a maximum hardness of around 382 HV. The same hardness was reached by 1 hour of solution treatment at 950 ℃ followed by 5 hours aging at 750 ℃. The effects of processing parameters on the characteristics of LMD processed Alloy 718 are compared and discussed. A 2-dimentional map of porosity distribution along the length of the sample is made and the patterns are investigated along both the length and the height of the sample. It is found in the sample that the starting part of the deposit is higher in number of pores while the finishing part is larger in pore size. It is also found that the top layer of the deposit has the highest porosity level, pore number and pore size. Moreover, the hardness gradient along the build-up direction is evaluated and discussed. No significant hardness gradient was found. The precipitation hardening effect of LMD process and possible improvements are also discussed.
Subjects/Keywords: Additive; Deposition; Alloy 718
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Cao, P. (2016). Characterization of Laser Deposited Alloy 718. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182603
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cao, Pengcheng. “Characterization of Laser Deposited Alloy 718.” 2016. Thesis, KTH. Accessed March 06, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182603.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cao, Pengcheng. “Characterization of Laser Deposited Alloy 718.” 2016. Web. 06 Mar 2021.
Vancouver:
Cao P. Characterization of Laser Deposited Alloy 718. [Internet] [Thesis]. KTH; 2016. [cited 2021 Mar 06].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182603.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cao P. Characterization of Laser Deposited Alloy 718. [Thesis]. KTH; 2016. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182603
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Georgia Tech
20.
Mirkoohi, Elham.
Analytical Mechanics Modeling of Residual Stress in Metal Additive Manufacturing.
Degree: PhD, Mechanical Engineering, 2020, Georgia Tech
URL: http://hdl.handle.net/1853/62803
► Analytical Mechanics modeling of residual stress in metal additive manufacturing Elham Mirkoohi 170 Pages Directed by Dr. Steven Y. Liang In the past several years,…
(more)
▼ Analytical Mechanics modeling of residual stress in metal
additive manufacturing
Elham Mirkoohi
170 Pages
Directed by Dr. Steven Y. Liang
In the past several years, metal
additive manufacturing (AM) has become a revolutionary technology to build three-dimensional complex parts via metallic powders in a layer by layer fashion. Parts built via AM have several advantages over conventional manufacturing including, lower density induced lower energy usage, elimination of multi-step manufacturing of intricated parts, no need for specific tools, reduction in material scrap rate, and many more. Aside from these advantages, there are still some limitations that impede the applicability of the AM such as steep temperature gradient, residual stress, distortion, anisotropy, and heterogeneity in microstructure and mechanical properties.
The available knowledge and technology to-date on the description and prediction of the metal AM process have been fragmented, mostly driven by phenomenological or numerical observations and primarily limited to macroscopic analysis in nature, thus restricting the full capability potential of the AM process. To breakthrough these technology bottlenecks, novel physics-based closed-form analytical thermomechanical models flanked by computational mechanics of materials are proposed to allow rapid, explicit and closed-form solutions of the AM part mechanical attributes including temperature field, thermal stress distribution, residual stress distribution induced part failure due to crack initiation and growth, and the microstructural attributes of the additively manufactured part to be derived as explicit functions of the metal powder starting properties and AM process parameters.
The thermal signature of the AM process is predicted using a transient moving heat source approach. Due to the high-temperature gradient innate in this process, material may experience high thermal stress which often exceeds the yield strength. The thermal stress is obtained from Green’s functions of stresses due to the point body load. The modified Johnson-Cook flow stress model is used to predict the yield surface. In this flow stress model, the yield strength parameter is modified to incorporate the effect of grain size using the Hall-Patch equation. The dynamic recrystallization and the resultant grain size are predicted by utilizing the Johnson–Mehl–Avrami–Kolmogorov (JMAK) model. Moreover, a grain refinement model is used to include the effect of the rapid solidification on grain size. Then, as a result of the cyclic heating and cooling and the fact that the material is yielded, the residual stress build-up is precited from incremental plasticity and kinematic hardening behavior of the metal according to the property of volume invariance in plastic deformation in coupling with the equilibrium and compatibility conditions. The predictive modeling results have been experimentally and numerically validated in encouraging agreements.
Advisors/Committee Members: Liang, Steven Y. (advisor), Garmestani, Hamid (committee member), Melkote, Shreyes N. (committee member), Kurfess, Thomas (committee member), Saldana, Christopher J. (committee member).
Subjects/Keywords: Additive Manufacturing; Residual Stress
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mirkoohi, E. (2020). Analytical Mechanics Modeling of Residual Stress in Metal Additive Manufacturing. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62803
Chicago Manual of Style (16th Edition):
Mirkoohi, Elham. “Analytical Mechanics Modeling of Residual Stress in Metal Additive Manufacturing.” 2020. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/62803.
MLA Handbook (7th Edition):
Mirkoohi, Elham. “Analytical Mechanics Modeling of Residual Stress in Metal Additive Manufacturing.” 2020. Web. 06 Mar 2021.
Vancouver:
Mirkoohi E. Analytical Mechanics Modeling of Residual Stress in Metal Additive Manufacturing. [Internet] [Doctoral dissertation]. Georgia Tech; 2020. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/62803.
Council of Science Editors:
Mirkoohi E. Analytical Mechanics Modeling of Residual Stress in Metal Additive Manufacturing. [Doctoral Dissertation]. Georgia Tech; 2020. Available from: http://hdl.handle.net/1853/62803
Clemson University
21.
Fry, Sean.
Test Frame Design for Characterization of Additive Manufacturing Compliant Materials.
Degree: MS, Mechanical Engineering, 2020, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/3358
► With the application of using surrogate models with General Purpose Graphics Processing (GPGPU) computing to meet the need for “real-time” characterization of nonlinear anisotropic…
(more)
▼ With the application of using surrogate models with General Purpose Graphics Processing (GPGPU) computing to meet the need for “real-time” characterization of nonlinear anisotropic material systems and the growing work of using multiaxial robotic test frames for material characterization, there has been a solution for a specific application towards
additive manufacturing materials, specifically polymers. Traditional testing using uniaxial and biaxial test machines has proven insufficient in characterizing the material properties of
additive manufacturing materials, therefore developing a need for a multiaxial testing machine for characterization that can dynamically excite strain states for a more in-depth look at the material properties. This design report presents the design of a multiaxial robotic test frame that incorporates a Stewart-Gough (SG) platform design to allow 6 degrees-of-freedom for multiple and combined loading applications. This solution is the next generation multiaxial machine focusing on
additive manufacturing materials, specifically polymers. The problem statement is the following: Design and fabricate a multiaxial robotic test frame that can test
additive manufacturing materials, focusing on polymers and some metals, in 6 degrees-of-freedom while improving on performance and cost over the CSM design.
Advisors/Committee Members: Cameron Turner, Joshua Summers, Garrett Pataky.
Subjects/Keywords: Additive Manufacturing; Characterization; Stewart-Gough
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Fry, S. (2020). Test Frame Design for Characterization of Additive Manufacturing Compliant Materials. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/3358
Chicago Manual of Style (16th Edition):
Fry, Sean. “Test Frame Design for Characterization of Additive Manufacturing Compliant Materials.” 2020. Masters Thesis, Clemson University. Accessed March 06, 2021.
https://tigerprints.clemson.edu/all_theses/3358.
MLA Handbook (7th Edition):
Fry, Sean. “Test Frame Design for Characterization of Additive Manufacturing Compliant Materials.” 2020. Web. 06 Mar 2021.
Vancouver:
Fry S. Test Frame Design for Characterization of Additive Manufacturing Compliant Materials. [Internet] [Masters thesis]. Clemson University; 2020. [cited 2021 Mar 06].
Available from: https://tigerprints.clemson.edu/all_theses/3358.
Council of Science Editors:
Fry S. Test Frame Design for Characterization of Additive Manufacturing Compliant Materials. [Masters Thesis]. Clemson University; 2020. Available from: https://tigerprints.clemson.edu/all_theses/3358
Delft University of Technology
22.
Herranz de la Nava, Alba (author).
Voxel-based additive manufacturing of biomimetic functionally graded materials.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:119cf85d-4359-4fab-8fe8-1ced1ea6224b
► Nature has evolved materials with outstanding mechanical properties, which attain high values of both strength and toughness. The key to their success lies in the…
(more)
▼ Nature has evolved materials with outstanding mechanical properties, which attain high values of both strength and toughness. The key to their success lies in the combination of hard and soft constituents in a intricate pattern. The design of natural materials allows for the development of toughening mechanisms that increase the overall fracture energy of the sample while keeping the stiffness provided by the hard constituents, as it is demonstrated in the brick-and-mortar pattern of nacre. In addition, the development of graded material transitions avoids failure at material interfaces with a high mismatch in stiffness. This is crucial for the success of certain structures in the human body, such as the connections of ligaments and tendons to bone. Due to their marvellous design and superior mechanical properties, natural materials are a source of inspiration for the development of biomimetic advanced materials. The advancement of multi-material
additive manufacturing (AM) has eased the production of structures that combine materials with different properties. Voxel-based 3D printing is an innovative technique that allows for the strategic placement of voxels of different materials at a high resolution using PolyJet technology. Several studies have attempted to produce brick-and-mortar or graded patterns. However, the production of functionally graded structures by voxel-based
additive manufacturing is still a novelty, and the effects of the graded pattern and material ratio have not been assessed. In addition, the performance of brick-and-mortar patterns and graded transitions in the same structure have not been evaluated. In this project, several patterns for material graded transitions have been designed, produced by voxel-based AM and assessed by fracture mechanics and tensile tests. The effect of different material ratio distributions on the mechanical properties of the specimen have also been evaluated. Digital image correlation techniques provided insightful information about the strain distribution in certain patterns, and how they influence the fracture toughness of samples. A biomimetic model of a human knee was developed in order to compare the performance of sharp and graded interfaces in real-like scenarios. Furthermore, brick-andmortar patterns with different designs, hierarchy levels and platelet aspect ratio have been created, and the patterns’ single and combined effect with a gradient pattern have been assessed. The results outlined that the function that determines the pattern formaterial change does not contribute significantly to an improvement of the mechanical properties, specially when the transition reaches points of pure material concentration. By contrast, when complementary material ratios are located at both sides of an interface, the fracture toughness of the samples is enhanced. Thus, it was demonstrated that the distribution of material ratio in a complementary manner but avoiding sites of pure hard material presents the most optimal boost of toughness in the specimens.…
Advisors/Committee Members: Mirzaali Mazandarani, Mohammad (mentor), Zadpoor, Amir (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Additive Manufacturing; Biomimetic; Gradients
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Herranz de la Nava, A. (. (2018). Voxel-based additive manufacturing of biomimetic functionally graded materials. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:119cf85d-4359-4fab-8fe8-1ced1ea6224b
Chicago Manual of Style (16th Edition):
Herranz de la Nava, Alba (author). “Voxel-based additive manufacturing of biomimetic functionally graded materials.” 2018. Masters Thesis, Delft University of Technology. Accessed March 06, 2021.
http://resolver.tudelft.nl/uuid:119cf85d-4359-4fab-8fe8-1ced1ea6224b.
MLA Handbook (7th Edition):
Herranz de la Nava, Alba (author). “Voxel-based additive manufacturing of biomimetic functionally graded materials.” 2018. Web. 06 Mar 2021.
Vancouver:
Herranz de la Nava A(. Voxel-based additive manufacturing of biomimetic functionally graded materials. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 06].
Available from: http://resolver.tudelft.nl/uuid:119cf85d-4359-4fab-8fe8-1ced1ea6224b.
Council of Science Editors:
Herranz de la Nava A(. Voxel-based additive manufacturing of biomimetic functionally graded materials. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:119cf85d-4359-4fab-8fe8-1ced1ea6224b
Delft University of Technology
23.
Sarakinioti, M.V. (author).
The spongy skin: The potentials of AM methods in cellular structures.
Degree: 2016, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:8e9de23d-4c31-4eff-bcec-131a80df08ee
► This graduation project is researching the additive manufacturing and the potentials it can gives in designing and producing complex geometries that with conventional production methods…
(more)
▼ This graduation project is researching the additive manufacturing and the potentials it can gives in designing and producing complex geometries that with conventional production methods it would have been restrictive to do.In addition how these complex geometries like cellular structures can provide good thermal performance and additional functions for a facade panel.
Building Technology
Architecture and The Built Environment
Advisors/Committee Members: Knaack, U. (mentor), Turrin, M. (mentor), Tenpierik, M.J. (mentor).
Subjects/Keywords: facade; cellular structures; additive manufacturing
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sarakinioti, M. V. (. (2016). The spongy skin: The potentials of AM methods in cellular structures. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8e9de23d-4c31-4eff-bcec-131a80df08ee
Chicago Manual of Style (16th Edition):
Sarakinioti, M V (author). “The spongy skin: The potentials of AM methods in cellular structures.” 2016. Masters Thesis, Delft University of Technology. Accessed March 06, 2021.
http://resolver.tudelft.nl/uuid:8e9de23d-4c31-4eff-bcec-131a80df08ee.
MLA Handbook (7th Edition):
Sarakinioti, M V (author). “The spongy skin: The potentials of AM methods in cellular structures.” 2016. Web. 06 Mar 2021.
Vancouver:
Sarakinioti MV(. The spongy skin: The potentials of AM methods in cellular structures. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2021 Mar 06].
Available from: http://resolver.tudelft.nl/uuid:8e9de23d-4c31-4eff-bcec-131a80df08ee.
Council of Science Editors:
Sarakinioti MV(. The spongy skin: The potentials of AM methods in cellular structures. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:8e9de23d-4c31-4eff-bcec-131a80df08ee
24.
Laverne, Floriane.
Concevoir avec la Fabrication Additive : Une proposition d’intégration amont de connaissances relatives à une innovation technologique : Integrating knowledge on technological innovation in the early design. Application to the context of Additive Manufacturing.
Degree: Docteur es, Génie industriel, 2016, Paris, ENSAM
URL: http://www.theses.fr/2016ENAM0042
► La Fabrication Additive (FA) vient aujourd’hui bouleverser des habitudes de conception bien ancrées, et suscite dans le même temps un intérêt grandissant pour les perspectives…
(more)
▼ La Fabrication Additive (FA) vient aujourd’hui bouleverser des habitudes de conception bien ancrées, et suscite dans le même temps un intérêt grandissant pour les perspectives qu’elle offre pour l’innovation produit. Pourtant, alors que les enjeux liés à l’innovation sont prépondérants en conception amont, peu de concepteurs connaissent et utilisent le potentiel des connaissances FA pour développer puis sélectionner des solutions créatives. Dans ce contexte, notre recherche a pour objectif d’augmenter la capacité d’innovation des concepteurs en intégrant des connaissances FA lors de la conception amont. Pour cela nous proposons d’intégrer des connaissances FA explicites dites « au juste besoin », c’est-à-dire dont le contenu, l'instanciation et le support sont adaptés aux besoins des équipes de conception. De plus, nous proposons que cette intégration s’effectue dans un modèle de conception permettant l’approche Design With Additive Manufacturing (DWAM). Nos apports sont la proposition : d’une démarche, basée sur le Knowledge Management, permettant de repérer, capitaliser puis valoriser les connaissances FA au juste besoin ; mais également d’un modèle de conception amont en 3 étapes dans lequel les connaissances FA utiles à l’approche DWAM sont spécifiées. Enfin, ce modèle enrichi est valorisé dans un outil numérique support afin de faciliter le travail collaboratif et concourant.
The onset of Additive Manufacturing (AM) upsets design practices and is receiving attention because its potential is promising for product innovation. However, while innovation issues are paramount during early design stages, few designers have sufficient knowledge about AM and use it poorly to develop creative solutions. Thus, our research objective is the increase of the innovation capacity of the design team through the integration of AM knowledge into early design. To do this, we propose to use “just needed” AM knowledge, i.e., AM knowledge whose contents, supports and instancing are tailored to the design team needs. Moreover, we propose that this integration takes place in a design model that allows the Design With Additive Manufacturing (DWAM) approach. Our contributions are both the proposal of a methodology based on Knowledge Management dedicated to the identification, the capitalization and the valorization of the “just needed” AM knowledge; and of a design model in 3 stages, in which the useful for DWAM approach AM knowledge is specified. Finally, this enriched model is valued in a digital tool in order to improve collaborative and concurrent design.
Advisors/Committee Members: Le Coq, Marc (thesis director).
Subjects/Keywords: Fabrication additive; Design With Additive Manufacturing (DWAM); Innovation; Connaissance; Additive Manufacturing; Design With Additive Manufacturing (DWAM); Innovation; Knowledge
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Laverne, F. (2016). Concevoir avec la Fabrication Additive : Une proposition d’intégration amont de connaissances relatives à une innovation technologique : Integrating knowledge on technological innovation in the early design. Application to the context of Additive Manufacturing. (Doctoral Dissertation). Paris, ENSAM. Retrieved from http://www.theses.fr/2016ENAM0042
Chicago Manual of Style (16th Edition):
Laverne, Floriane. “Concevoir avec la Fabrication Additive : Une proposition d’intégration amont de connaissances relatives à une innovation technologique : Integrating knowledge on technological innovation in the early design. Application to the context of Additive Manufacturing.” 2016. Doctoral Dissertation, Paris, ENSAM. Accessed March 06, 2021.
http://www.theses.fr/2016ENAM0042.
MLA Handbook (7th Edition):
Laverne, Floriane. “Concevoir avec la Fabrication Additive : Une proposition d’intégration amont de connaissances relatives à une innovation technologique : Integrating knowledge on technological innovation in the early design. Application to the context of Additive Manufacturing.” 2016. Web. 06 Mar 2021.
Vancouver:
Laverne F. Concevoir avec la Fabrication Additive : Une proposition d’intégration amont de connaissances relatives à une innovation technologique : Integrating knowledge on technological innovation in the early design. Application to the context of Additive Manufacturing. [Internet] [Doctoral dissertation]. Paris, ENSAM; 2016. [cited 2021 Mar 06].
Available from: http://www.theses.fr/2016ENAM0042.
Council of Science Editors:
Laverne F. Concevoir avec la Fabrication Additive : Une proposition d’intégration amont de connaissances relatives à une innovation technologique : Integrating knowledge on technological innovation in the early design. Application to the context of Additive Manufacturing. [Doctoral Dissertation]. Paris, ENSAM; 2016. Available from: http://www.theses.fr/2016ENAM0042
25.
LAU TZE SIONG.
A Fast Method to Segment Images with Additive Intensity Value.
Degree: 2012, National University of Singapore
URL: http://scholarbank.nus.edu.sg/handle/10635/33343
Subjects/Keywords: Additive Segmentation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
SIONG, L. T. (2012). A Fast Method to Segment Images with Additive Intensity Value. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/33343
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
SIONG, LAU TZE. “A Fast Method to Segment Images with Additive Intensity Value.” 2012. Thesis, National University of Singapore. Accessed March 06, 2021.
http://scholarbank.nus.edu.sg/handle/10635/33343.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
SIONG, LAU TZE. “A Fast Method to Segment Images with Additive Intensity Value.” 2012. Web. 06 Mar 2021.
Vancouver:
SIONG LT. A Fast Method to Segment Images with Additive Intensity Value. [Internet] [Thesis]. National University of Singapore; 2012. [cited 2021 Mar 06].
Available from: http://scholarbank.nus.edu.sg/handle/10635/33343.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
SIONG LT. A Fast Method to Segment Images with Additive Intensity Value. [Thesis]. National University of Singapore; 2012. Available from: http://scholarbank.nus.edu.sg/handle/10635/33343
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
26.
Wang, Marc.
Part Performance Measurement, Analysis and Optimization for Binder Jetting Additive Manufacturing.
Degree: 2020, University of Waterloo
URL: http://hdl.handle.net/10012/16455
► Binder Jetting (BJ) is an additive manufacturing (AM) process where objects are formed layer by layer. The manufacturing of parts is performed by depositing powder…
(more)
▼ Binder Jetting (BJ) is an additive manufacturing (AM) process where objects are formed layer by layer. The manufacturing of parts is performed by depositing powder layer by layer and binding them together using a binding agent resulting in a green part. This is followed by thermal processing to fuse powder particles together.
Unfortunately, achieving full density through the thermal process is difficult due to the low initial density of the green part. Full density will result in substantial shrinkage. Consequentially, there is an incentive to maximize the density of the green part. Sadly, due to the presence of surface connected pores, measuring the density of green parts is not trivial. This work will propose a measurement methodology for measuring green density and processing computed tomography images obtained from green binder jetting parts. It was discovered that no standard was codified for the density measurement of such parts using either Archimedes or Micro-Tomography. Based on experimentally informed analysis, the use of the methodology ISO 5013 for measuring relative bulk density is recommended. Among the three methodologies evaluated (oil infiltration and wax coating), ISO 5013 was the method with the lowest average estimated measurement error (0.36%). In parallel, computed tomography datasets were analyzed, where multiple global threshold techniques were evaluated to extract bulk density metrics. Through experimentally informed analysis, the threshold method Otsu, Mean and Isodata were the most consistent at segmenting computed tomography image of green samples.
The second section of this thesis tackles heterogeneity issues found in previous work. Wheat et al. attributed the heterogeneity to powder segregation. Unfortunately, due to the fragility of green BJAM parts, only computed tomography could observe the internal powder arrangement. Consequently, particle segmentation and detection software was developed, specifically tailored towards capturing the particle space for BJAM parts. Two approaches were tried: curvature-based watershed segmentation and Mask-RCNN. The micro-tomography images were knowingly degraded to achieve high data acquisition throughput. Unfortunately, this heavily degraded the performance of both Watershed and Mask-RCNN segmentation. Watershed segmentation displayed acceptable segmentation (70.7%) but poor detection performance (26.6%). Alternatively, Mask-RCNN scored similar segmentation performance (71.3%) with watershed but with twice the detection (48.1%). Regrettably, current performance of Mask-RCNN are inadequate for use in detecting particle segregation.
The last section proposes the use of multi-objective Bayesian optimization algorithm for optimizing the process parameters for BJAM. The proposed algorithm managed to minimize porosity (37.5%), while keeping print time low (87 min). Unfortunately, dimensional fidelity were still low (Δ 2.33 x 1.86 x 1.95 mm). The method has the potential of reducing the number of empirical trials to perform optimization, while…
Subjects/Keywords: additive manufacturing; optimization; metrology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wang, M. (2020). Part Performance Measurement, Analysis and Optimization for Binder Jetting Additive Manufacturing. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/16455
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wang, Marc. “Part Performance Measurement, Analysis and Optimization for Binder Jetting Additive Manufacturing.” 2020. Thesis, University of Waterloo. Accessed March 06, 2021.
http://hdl.handle.net/10012/16455.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wang, Marc. “Part Performance Measurement, Analysis and Optimization for Binder Jetting Additive Manufacturing.” 2020. Web. 06 Mar 2021.
Vancouver:
Wang M. Part Performance Measurement, Analysis and Optimization for Binder Jetting Additive Manufacturing. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/10012/16455.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wang M. Part Performance Measurement, Analysis and Optimization for Binder Jetting Additive Manufacturing. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/16455
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Notre Dame
27.
Kirsten Marie Kozlovsky.
Additive Manufacturing of Ultra-High Molecular Weight
Polyethylene Under Applied External Pressure</h1>.
Degree: Aerospace and Mechanical Engineering, 2019, University of Notre Dame
URL: https://curate.nd.edu/show/kh04dn4320k
► Additive Manufacturing (AM) has been widely applied to many material classes and economic sectors. AM is of special interest to the medical device industry…
(more)
▼ Additive Manufacturing (AM) has been widely
applied to many material classes and economic sectors. AM is of
special interest to the medical device industry because of the need
for complex geometries, the economics associated with tool
elimination, and the ability to democratize production.
Unfortunately, AM materials currently are lacking with respect to
wear resistance. In orthopedics applications,
ultra-high molecular weight polyethylene (UHMWPE) has emerged as
the preferred bearing material. Typically, UHMWPE is produced
through compression molding or sintering, followed by machining to
final tolerances. Producing UHMWPE components with AM would
represent a major accomplishment that has been elusive to date. The
main problem is the very high viscosity of UHMWPE upon melting,
which limits reflow that can take place in a powder bed
process. This thesis demonstrated in-situ
pressurization in AM of UHMWPE for the first time, leading to
increases in strength and wear resistance even under moderate
applied pressures. A novel
additive
manufacturing machine was fabricated, complete with conventional
selective laser sintering controls and a pneumatic mechanism for
applying pressure through a glass plate onto the powder in the
build chamber. By using glass, the powder is sintered while
pressurized. The apparatus produced in this research used a fiber
laser and commercial toner (Clearweld
®)
added to the UHMWPE powder to produce AM components.
A design of experiments approach demonstrated
that improvements in strength and density could be achieved. Even
more impressive were the gains in wear resistance, evaluated by
using an AMTI OrthoPOD. The research demonstrated the scientific
hypothesis that selective laser sintering combined with in-situ
pressurization is a viable approach for producing high-performance
polymers like UHMWPE. The pressures applied were only 0.015 MPa,
due to limitations in the pneumatic design and compressed air
available. Much higher pressures could easily be designed into the
system using hydraulic or mechanical compression means.
Mathematical models suggest the higher pressure will have an even
greater effect on material properties.
Advisors/Committee Members: Steven Schmid, Research Director.
Subjects/Keywords: Additive Manufacturing; Selective Laser Sintering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kozlovsky, K. M. (2019). Additive Manufacturing of Ultra-High Molecular Weight
Polyethylene Under Applied External Pressure</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/kh04dn4320k
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kozlovsky, Kirsten Marie. “Additive Manufacturing of Ultra-High Molecular Weight
Polyethylene Under Applied External Pressure</h1>.” 2019. Thesis, University of Notre Dame. Accessed March 06, 2021.
https://curate.nd.edu/show/kh04dn4320k.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kozlovsky, Kirsten Marie. “Additive Manufacturing of Ultra-High Molecular Weight
Polyethylene Under Applied External Pressure</h1>.” 2019. Web. 06 Mar 2021.
Vancouver:
Kozlovsky KM. Additive Manufacturing of Ultra-High Molecular Weight
Polyethylene Under Applied External Pressure</h1>. [Internet] [Thesis]. University of Notre Dame; 2019. [cited 2021 Mar 06].
Available from: https://curate.nd.edu/show/kh04dn4320k.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kozlovsky KM. Additive Manufacturing of Ultra-High Molecular Weight
Polyethylene Under Applied External Pressure</h1>. [Thesis]. University of Notre Dame; 2019. Available from: https://curate.nd.edu/show/kh04dn4320k
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
28.
Gonzales, Devon Scott.
Development of metal matrix composite powder cored tubular wire for electron beam freeform fabrication.
Degree: MS(M.S.), Metallurgical and Materials Engineering, 2015, Colorado School of Mines
URL: http://hdl.handle.net/11124/170006
► Electron Beam Freeform Fabrication (EBF3) is a technique, developed at NASA Langley Research Center (NASA-LaRC), which uses a computerized numerical controlled electron beam welder and…
(more)
▼ Electron Beam Freeform Fabrication (EBF3) is a technique, developed at NASA Langley Research Center (NASA-LaRC), which uses a computerized numerical controlled electron beam welder and a wire feed system to fabricate large scale aerospace parts. Advantages of using EBF3 as opposed to conventional manufacturing methods include decreased deign-to-product time, decreased wasted material, and the ability to adapt controls to produce geometrically complex parts. The EBF3 process is compatible with a range of aerospace alloys and material properties of parts produced by this process have been shown to be comparable to wrought products. However, to fully exploit the potential of the EBF3 process, development of materials tailored for the process is required. This research used alloy theory, as well as powder cored tubular wire technology, to develop aluminum based metal matrix composite feedstock for the EBF3 system. Five iterations of powder cored tubular wire were made using silicon carbide particulates with different surface conditions. Uncoated particles, as well as particles with high and low amounts of copper and nickel coatings, were incorporated into the powder core. Single and multiple layer deposits were made using each wire. Beam conditions were varied for each wire to determine the optimal combination of feedstock material and electron beam parameters required to create a uniformly distributed metal matrix composite deposit using EBF3. Completely uniform dispersion of the reinforcement particles was not achieved in the matrix, however, it was determined that nickel additions enhanced particle dispersion as well as mitigated solidification cracking and secondary carbide formation. It was also determined that using a lower energy beam also promotes dispersion and mitigates secondary carbide formation. Computational models were created to predict phase transformations and particle dispersion in the matrix for various conditions. The thermodynamic and fluid dynamic models were able to describe trends observed through characterization of EBF3 depositions. Results collected from characterization of the deposits as well as trends observed in the models can be used to plan future iterations of powder cored tubular wire feedstock, as well as deposition parameters, to create homogeneous metal matrix composite structures by Electron Beam Freeform Fabrication.
Advisors/Committee Members: Liu, Stephen (advisor), Bourne, Gerald (committee member), Yu, Zhenzhen (committee member), Domack, Marcia S. (committee member), Hafley, Robert A. (committee member).
Subjects/Keywords: additive manufacturing; metal matrix composites
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gonzales, D. S. (2015). Development of metal matrix composite powder cored tubular wire for electron beam freeform fabrication. (Masters Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170006
Chicago Manual of Style (16th Edition):
Gonzales, Devon Scott. “Development of metal matrix composite powder cored tubular wire for electron beam freeform fabrication.” 2015. Masters Thesis, Colorado School of Mines. Accessed March 06, 2021.
http://hdl.handle.net/11124/170006.
MLA Handbook (7th Edition):
Gonzales, Devon Scott. “Development of metal matrix composite powder cored tubular wire for electron beam freeform fabrication.” 2015. Web. 06 Mar 2021.
Vancouver:
Gonzales DS. Development of metal matrix composite powder cored tubular wire for electron beam freeform fabrication. [Internet] [Masters thesis]. Colorado School of Mines; 2015. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/11124/170006.
Council of Science Editors:
Gonzales DS. Development of metal matrix composite powder cored tubular wire for electron beam freeform fabrication. [Masters Thesis]. Colorado School of Mines; 2015. Available from: http://hdl.handle.net/11124/170006
Colorado School of Mines
29.
Barna, Danielle M.
Statistical approach to quantifying the spatial distribution of porosity defects in Inconel 718, A.
Degree: MS(M.S.), Applied Mathematics and Statistics, 2020, Colorado School of Mines
URL: http://hdl.handle.net/11124/174188
► As 3D imaging of materials becomes increasingly accessible the materials science community has a growing need for relevant statistics that quantify the internal structure of…
(more)
▼ As 3D imaging of materials becomes increasingly accessible the materials science community has a growing need for relevant statistics that quantify the internal structure of manufactured parts. Such statistics can be sensitive to the orientation of the imaged part; we implement a method of orienting imaging data by fitting by least squares simple geometric surfaces to 3D data. A Monte-Carlo based method for evaluating the statistical uncertainty associated with such orientation is also proposed. An application of this model is explored using samples of Inconel 718 built through
additive manufacturing. A subsequent analysis attempts to detect layers in the porosity defect structure of Inconel 718 samples. The analysis found little evidence for layering.
Advisors/Committee Members: Nychka, Douglas (advisor), Kappes, Branden Bernard (committee member), Hammerling, Dorit (committee member).
Subjects/Keywords: porosity; additive manufacturing; uncertainty quantification
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Barna, D. M. (2020). Statistical approach to quantifying the spatial distribution of porosity defects in Inconel 718, A. (Masters Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/174188
Chicago Manual of Style (16th Edition):
Barna, Danielle M. “Statistical approach to quantifying the spatial distribution of porosity defects in Inconel 718, A.” 2020. Masters Thesis, Colorado School of Mines. Accessed March 06, 2021.
http://hdl.handle.net/11124/174188.
MLA Handbook (7th Edition):
Barna, Danielle M. “Statistical approach to quantifying the spatial distribution of porosity defects in Inconel 718, A.” 2020. Web. 06 Mar 2021.
Vancouver:
Barna DM. Statistical approach to quantifying the spatial distribution of porosity defects in Inconel 718, A. [Internet] [Masters thesis]. Colorado School of Mines; 2020. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/11124/174188.
Council of Science Editors:
Barna DM. Statistical approach to quantifying the spatial distribution of porosity defects in Inconel 718, A. [Masters Thesis]. Colorado School of Mines; 2020. Available from: http://hdl.handle.net/11124/174188
University of Limerick
30.
Mooney, Barry.
Plastic anisotropy of additively manufactured maraging steel : influence of the build orientation and heat treatment.
Degree: 2018, University of Limerick
URL: http://hdl.handle.net/10344/7600
► peer-reviewed
This study investigates the combined effect of three Additive Manufacturing (AM) build orientations (0° , 45° , and 90° ) and an extensive array…
(more)
▼ peer-reviewed
This study investigates the combined effect of three Additive Manufacturing (AM)
build orientations (0° , 45° , and 90° ) and an extensive array of heat-treatment plans
on the plastic anisotropy of EOS maraging steel 300 (coded by EOS as ’MS1’)
fabricated on the EOSINT M280 Direct Metal Laser Sintering (DMLS) system. A
comparison between the material microstructural characteristics, mechanical performance,
plastic strain behaviour and anisotropy levels of identical parts fabricated
on two of these independently operated DMLS systems was also conducted. Considerable
plastic anisotropy has been confirmed in the as-built condition, which can
be reduced by aging heat-treatment, as verified in this study. However, it has identified
that a degree of transverse strain anisotropy is likely to remain due to the
AM alloy’s fabrication history, a finding that has not been previously reported in
the literature. Significant microstructural discrepancies, affecting mechanical performance,
plasticity and anisotropy levels, have also been observed in the as-built
samples obtained from the two DMLS systems. A difference in the angle of the laser
scan strategy, in conjunction with unfavourable powder feedstock characteristics,
are understood to have had a profound influence on the plasticity and anisotropy
divergences observed. A comprehensive visual representation of the material’s overall
mechanical properties against the various heat-treatment plans is offered through
time-temperature contour maps. Moreover, the heat-treatment plan (6h at 490° C)
recommended by the DMLS system manufacturer has been found not to be the
optimal in terms of achieving high strength, hardness, ductility and low anisotropy
for the MS1 material. With the use of the comprehensive experimental data collected
and analysed in this study, and presented in the constructed contour maps,
the alloy’s heat-treatment parameters (time, temperature) can be tailored to meet
the desired strength/ductility/anisotropy design requirements, either for research or
part production purposes.
Advisors/Committee Members: Kourousis, Kyriakos I., IRC.
Subjects/Keywords: plastic anisotropy; additive manufacturing (AM)
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mooney, B. (2018). Plastic anisotropy of additively manufactured maraging steel : influence of the build orientation and heat treatment. (Thesis). University of Limerick. Retrieved from http://hdl.handle.net/10344/7600
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mooney, Barry. “Plastic anisotropy of additively manufactured maraging steel : influence of the build orientation and heat treatment.” 2018. Thesis, University of Limerick. Accessed March 06, 2021.
http://hdl.handle.net/10344/7600.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mooney, Barry. “Plastic anisotropy of additively manufactured maraging steel : influence of the build orientation and heat treatment.” 2018. Web. 06 Mar 2021.
Vancouver:
Mooney B. Plastic anisotropy of additively manufactured maraging steel : influence of the build orientation and heat treatment. [Internet] [Thesis]. University of Limerick; 2018. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/10344/7600.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mooney B. Plastic anisotropy of additively manufactured maraging steel : influence of the build orientation and heat treatment. [Thesis]. University of Limerick; 2018. Available from: http://hdl.handle.net/10344/7600
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] [4] [5] … [74] ▶
. 
Open Access Theses and Dissertations