subject:(loading mechanism)

University of Edinburgh

1. Mourão, Rodrigo Ferreiro Fernandes. Blast loading effects on externally strengthened concrete structures.

Degree: PhD, 2020, University of Edinburgh

► Concrete is a commonly used construction material in both civil and military infrastructures. Over the last few decades, it has been widely demonstrated that the… (more)

▼ Concrete is a commonly used construction material in both civil and military infrastructures. Over the last few decades, it has been widely demonstrated that the use of externally bonded fibre reinforced composites (FRP) is an efficient technique to strengthen such infrastructures to resist increased static loads for which they were not designed for. Nevertheless, the use of these techniques for improving the blast capacity of reinforced concrete (RC) structures has only recently been studied. Although such studies have highlighted an effective enhancement of the bearing capacity of RC members under explosions, no particular attention has been paid to the influence of blast loading on the performance of the bonded interface. This work presents a set of experimental campaigns to investigate and quantify the influence of blast loading on the structural resistance of FRP strengthened concrete structures with the focus on the performance of the bonded joint. Primarily, this research experimentally examines the quasi-static and blast performance of RC beams with externally bonded FRP strips. Experimental findings reveal that although the structural performance is comparable between both loading cases, the failure mechanism of FRP is different. Finite element models are developed and calibrated against experimental data and used to investigate in detail the reasons behind such difference. Secondly, a combined experimental/numerical investigation is performed on the influence of externally bonded FRP strips on the damage extent of concrete subjected to contact detonations. Twenty-seven contact detonations were conducted on concrete plates to verify the influence of bonding area, mass of attached material and concrete strength. Results reveal that FRP strips have a clear influence on the damage extent of concrete. By developing a finite element model of the experimental setup, it is found that the combination of momentum transmitted to the FRP together with the bonding effect gives rise to a complementary damage mechanism, leading to larger damaged areas. Additionally, current analytical methods to predict the structural performance of RC structures under blast loading, such as the single-degree-of-freedom, rely on the assumption that full bond is kept upon the structural failure, and as such are inadequate at providing a valid prediction of structural performance when disruption of FRP is an issue, as this directly influences the establishment of force-deflection characteristics of the member. To this end, commonly accepted design approximations for the establishment of force-deformation characteristics are discussed and an innovative method is proposed. SDOF analysis are conducted using the different modelling approaches and results are compared and discussed against experimental data. This PhD thesis highlight the complex behaviour of concrete structures strengthened with externally bonded FRP under blast loading, mostly when disruption of FRP is achieved, and should dissipate the idea that a design is accurate if…

Subjects/Keywords: reinforced concrete; fibre-reinforce polymers; blast loading; carbon-fibre composite material; extreme loading conditions; concrete-FRP; stress waves; damage mechanism

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mourão, R. F. F. (2020). Blast loading effects on externally strengthened concrete structures. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/37030

Chicago Manual of Style (16^th Edition):

Mourão, Rodrigo Ferreiro Fernandes. “Blast loading effects on externally strengthened concrete structures.” 2020. Doctoral Dissertation, University of Edinburgh. Accessed January 16, 2021. http://hdl.handle.net/1842/37030.

MLA Handbook (7^th Edition):

Mourão, Rodrigo Ferreiro Fernandes. “Blast loading effects on externally strengthened concrete structures.” 2020. Web. 16 Jan 2021.

Vancouver:

Mourão RFF. Blast loading effects on externally strengthened concrete structures. [Internet] [Doctoral dissertation]. University of Edinburgh; 2020. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/1842/37030.

Council of Science Editors:

Mourão RFF. Blast loading effects on externally strengthened concrete structures. [Doctoral Dissertation]. University of Edinburgh; 2020. Available from: http://hdl.handle.net/1842/37030

University of Edinburgh

2. Mourão, Rodrigo Ferreiro Fernandes. Blast loading effects on externally strengthened concrete structures.

Degree: PhD, 2020, University of Edinburgh

URL: https://doi.org/10.7488/era/331 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.806143

► Concrete is a commonly used construction material in both civil and military infrastructures. Over the last few decades, it has been widely demonstrated that the… (more)

▼ Concrete is a commonly used construction material in both civil and military infrastructures. Over the last few decades, it has been widely demonstrated that the use of externally bonded fibre reinforced composites (FRP) is an efficient technique to strengthen such infrastructures to resist increased static loads for which they were not designed for. Nevertheless, the use of these techniques for improving the blast capacity of reinforced concrete (RC) structures has only recently been studied. Although such studies have highlighted an effective enhancement of the bearing capacity of RC members under explosions, no particular attention has been paid to the influence of blast loading on the performance of the bonded interface. This work presents a set of experimental campaigns to investigate and quantify the influence of blast loading on the structural resistance of FRP strengthened concrete structures with the focus on the performance of the bonded joint. Primarily, this research experimentally examines the quasi-static and blast performance of RC beams with externally bonded FRP strips. Experimental findings reveal that although the structural performance is comparable between both loading cases, the failure mechanism of FRP is different. Finite element models are developed and calibrated against experimental data and used to investigate in detail the reasons behind such difference. Secondly, a combined experimental/numerical investigation is performed on the influence of externally bonded FRP strips on the damage extent of concrete subjected to contact detonations. Twenty-seven contact detonations were conducted on concrete plates to verify the influence of bonding area, mass of attached material and concrete strength. Results reveal that FRP strips have a clear influence on the damage extent of concrete. By developing a finite element model of the experimental setup, it is found that the combination of momentum transmitted to the FRP together with the bonding effect gives rise to a complementary damage mechanism, leading to larger damaged areas. Additionally, current analytical methods to predict the structural performance of RC structures under blast loading, such as the single-degree-of-freedom, rely on the assumption that full bond is kept upon the structural failure, and as such are inadequate at providing a valid prediction of structural performance when disruption of FRP is an issue, as this directly influences the establishment of force-deflection characteristics of the member. To this end, commonly accepted design approximations for the establishment of force-deformation characteristics are discussed and an innovative method is proposed. SDOF analysis are conducted using the different modelling approaches and results are compared and discussed against experimental data. This PhD thesis highlight the complex behaviour of concrete structures strengthened with externally bonded FRP under blast loading, mostly when disruption of FRP is achieved, and should dissipate the idea that a design is accurate if…

Subjects/Keywords: reinforced concrete; fibre-reinforce polymers; blast loading; carbon-fibre composite material; extreme loading conditions; concrete-FRP; stress waves; damage mechanism

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mourão, R. F. F. (2020). Blast loading effects on externally strengthened concrete structures. (Doctoral Dissertation). University of Edinburgh. Retrieved from https://doi.org/10.7488/era/331 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.806143

Chicago Manual of Style (16^th Edition):

Mourão, Rodrigo Ferreiro Fernandes. “Blast loading effects on externally strengthened concrete structures.” 2020. Doctoral Dissertation, University of Edinburgh. Accessed January 16, 2021. https://doi.org/10.7488/era/331 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.806143.

MLA Handbook (7^th Edition):

Mourão, Rodrigo Ferreiro Fernandes. “Blast loading effects on externally strengthened concrete structures.” 2020. Web. 16 Jan 2021.

Vancouver:

Mourão RFF. Blast loading effects on externally strengthened concrete structures. [Internet] [Doctoral dissertation]. University of Edinburgh; 2020. [cited 2021 Jan 16]. Available from: https://doi.org/10.7488/era/331 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.806143.

Council of Science Editors:

Mourão RFF. Blast loading effects on externally strengthened concrete structures. [Doctoral Dissertation]. University of Edinburgh; 2020. Available from: https://doi.org/10.7488/era/331 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.806143

NSYSU

3. Hong, Chang-sheng. Innovative design of high efficient polishing system for axial symmetric free surface: A newly line polishing method with adjustable pressure distribution.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2008, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808108-144907

► This study aims to develop a precision polishing system with high machining rate efficiency. The system is mainly composed of a loading mechanism, a work… (more)

▼ This study aims to develop a precision polishing system with high machining rate efficiency. The system is mainly composed of a loading mechanism, a work piece and a polishing pad with belt-shape. The loading mechanism is to generate a specific pressure distribution between the pad and the work surface.ãSuch a pressure distribution is to render the machining rate distribution, along the contact zone between pad and work surface, capable of compensating the work surface error.ãWith the capability of accurately removing the work surface error left by the previous machining method, this polishing system can improve the form precision of work and become an effective high precision machining tool. In this thesis, the relation between the applied loadings and the pressure distribution were established by the finite element method.ãA linear model described this relation with the applied loading as the input and the desired pressure distribution as the output. The unknown coefficients of the model were then derived from the simulation data by the finite element method. When a desired pressure distribution was given, the applied loadings could be solved from the model by either the simultaneous equation method or the least squared error method.ãA main issue to investigate in the study was to examine whether a pressure distribution with an arbitrary wavelength spectrum could be obtained by the proposed scheme. A detailed analysis about the effect of wavelength in pressure distribution on the precision of loading estimation was done. Four conclusions could be made from the study. 1.The proposed polishing system can be applied to a free surface with either concave or convex geometrical features 2.The proposed linear model can suggest proper loadings to generate desired pressure distribution with good precision if the wavelength of pressure distribution is large enough. 3.The Shannon sampling theorem can be used to give a qualitative description of the properness of the model in generating a desired pressure distribution. 4.The proposed polishing method has a high machining repeatability when the operating condition is well controlled. Advisors/Committee Members: Tu-Chieh Hung (chair), Jung-Shu Wu (chair), Kuang-Hua Fuh (chair), Yaw-Terng Su (committee member).

Subjects/Keywords: polishing pad with belt-shape; loading mechanism; line polishing method; finite element method

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hong, C. (2008). Innovative design of high efficient polishing system for axial symmetric free surface: A newly line polishing method with adjustable pressure distribution. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808108-144907

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hong, Chang-sheng. “Innovative design of high efficient polishing system for axial symmetric free surface: A newly line polishing method with adjustable pressure distribution.” 2008. Thesis, NSYSU. Accessed January 16, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808108-144907.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hong, Chang-sheng. “Innovative design of high efficient polishing system for axial symmetric free surface: A newly line polishing method with adjustable pressure distribution.” 2008. Web. 16 Jan 2021.

Vancouver:

Hong C. Innovative design of high efficient polishing system for axial symmetric free surface: A newly line polishing method with adjustable pressure distribution. [Internet] [Thesis]. NSYSU; 2008. [cited 2021 Jan 16]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808108-144907.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hong C. Innovative design of high efficient polishing system for axial symmetric free surface: A newly line polishing method with adjustable pressure distribution. [Thesis]. NSYSU; 2008. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808108-144907

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

4. Chiu, Sheng-Chan. New Design of Electric Folding Rollator.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2017, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704117-150800

► When searching for all the related products and patents for rollators, there is no concept of electric folding used in wheeled-rollators. Therefore, this thesis designs… (more)

Subjects/Keywords: graphics software Pro/E; deceleration mechanism; electric folding; stability testing; loading testing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chiu, S. (2017). New Design of Electric Folding Rollator. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704117-150800

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chiu, Sheng-Chan. “New Design of Electric Folding Rollator.” 2017. Thesis, NSYSU. Accessed January 16, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704117-150800.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chiu, Sheng-Chan. “New Design of Electric Folding Rollator.” 2017. Web. 16 Jan 2021.

Vancouver:

Chiu S. New Design of Electric Folding Rollator. [Internet] [Thesis]. NSYSU; 2017. [cited 2021 Jan 16]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704117-150800.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chiu S. New Design of Electric Folding Rollator. [Thesis]. NSYSU; 2017. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704117-150800

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Sydney

5. Nguyen, Van Vinh. Direct Strength Method for the Design of Cold-Formed Steel Sections Under Localised Loading .

Degree: 2017, University of Sydney

URL: http://hdl.handle.net/2123/17069

► The main objective of the thesis is the development of the Direct Strength Method (DSM) for the design of cold-formed steel sections under general localised… (more)

▼ The main objective of the thesis is the development of the Direct Strength Method (DSM) for the design of cold-formed steel sections under general localised loading. In order to calibrate the DSM equations, it is necessary to have three main input variables which are the buckling load, the yield load and the experimental data. The first objective of this research is the development of the Finite Strip Method (FSM) theory for analysis of thin-walled sections under localised loading with general end boundary conditions to determine the buckling load as described in Chapters 3 and 4 of the thesis. The theory is included in Version 2.0 of the THIN-WALL-2 program which can be used for analysing structural members under generalised loading conditions as described in Chapter 5. The second objective is the formulation of plastic mechanism models to estimate the yield load of thin-walled sections subjected to localised loading. In order to establish these models, observations are performed from experiments to ascertain the failure modes of structural members under localised loading with different cross-sections, load cases and flange fastening conditions. From the data, new simple plastic mechanism models are built-up based on the concept of the balance between the internal energy of the structural member and the external energy of the applied loads to estimate the yield load as described in Chapter 6. The third objective is collating the experimental data of thin-walled sections under localised loading. The data is collected from previous literature for different types of cross-sections: un-lipped plain-C, lipped plain-C, SupaCee and Dimond Hi-Span channel (DHS) sections subjected to all load cases. In addition, both flange fastened and unfastened conditions are assembled in the experimental database as described in Chapter 6. From these three input variables, the DSM design equations are proposed for structural members under general localised loading. The method is a consistent and simplified model generalised for all localised load cases. It includes both an inelastic reserve component as observed in testing and a yield load component. Also, a reliability analysis calibration is performed to validate the accuracy of the DSM predictions with the collected experimental data as described in Chapter 7.

Subjects/Keywords: direct strength method; localised loading; THIN-WALL-2 program; pre-bucking analysis; plastic mechanism models

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nguyen, V. V. (2017). Direct Strength Method for the Design of Cold-Formed Steel Sections Under Localised Loading . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/17069

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nguyen, Van Vinh. “Direct Strength Method for the Design of Cold-Formed Steel Sections Under Localised Loading .” 2017. Thesis, University of Sydney. Accessed January 16, 2021. http://hdl.handle.net/2123/17069.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nguyen, Van Vinh. “Direct Strength Method for the Design of Cold-Formed Steel Sections Under Localised Loading .” 2017. Web. 16 Jan 2021.

Vancouver:

Nguyen VV. Direct Strength Method for the Design of Cold-Formed Steel Sections Under Localised Loading . [Internet] [Thesis]. University of Sydney; 2017. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2123/17069.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nguyen VV. Direct Strength Method for the Design of Cold-Formed Steel Sections Under Localised Loading . [Thesis]. University of Sydney; 2017. Available from: http://hdl.handle.net/2123/17069

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

6. Tabbakhha, Maryam. Méthodologie multi-échelle pour évaluer la vulnérabilité des structures en maçonnerie : Multiscale methodology for vulnerability assessment of masonry structures.

Degree: Docteur es, Modélisation numérique en génie civile, 2013, Châtenay-Malabry, Ecole centrale de Paris

URL: http://www.theses.fr/2013ECAP0032

► L’objectif principal de cette étude est de développer des outils de simulation numérique pour évaluer la vulnérabilité des constructions en maçonnerie sous chargements variés. Ainsi,… (more)

▼ L’objectif principal de cette étude est de développer des outils de simulation numérique pour évaluer la vulnérabilité des constructions en maçonnerie sous chargements variés. Ainsi, le comportement de la maçonnerie non armée sous chargement monotone en macro- et micro-échelles est étudié. La simulation du comportement non linéaire du mur de maçonnerie avant et après le pic et la capture de son mécanisme de rupture sont les points centraux de ce travail. Tout d'abord, le mur de maçonnerie d’un panneau est remplacé par deux barres simples utilisant la stratégie des macros-éléments et un comportement tri-linéaire est proposé pour évaluer la résistance à la rupture de la paroi ainsi que son comportement avant et après le pic. L'absence de l'information sur le mécanisme de rupture du mur de maçonnerie et la relation entre le mécanisme de rupture et les propriétés mécaniques des éléments barres dans ce type de modélisation conduisent à opter pour une autre description de ces structures à savoir la stratégie de micro-modélisation. Dans cette stratégie, les unités et les mortiers sont modélisés séparément et l’ensemble du comportement inélastique du mur de maçonnerie est supposé se produire dans les mortiers. Par conséquent, une attention particulière sera accordée au développement d'une description fiable des propriétés matérielles de ces éléments à l'aide d'une loi constitutive précise. La représentation tridimensionnelle d'un mur de maçonnerie faite dans ce travail, améliore la capacité des méthodes actuelles pour prédire le comportement de la maçonnerie sous les deux chargements en plan et hors du plan. D’abord, des enveloppes de rupture comprenant la tension limite et la surface de charge de Mohr-Coulomb sont assignées à l'élément d'interface du code éléments finis GEFDyn. Ensuite, la loi de comportement est améliorée en ajoutant un seuil de compression aux surfaces de charge pour inclure l’endommagement en compression de la maçonnerie à travers l'élément d'interface. Dans le nouveau modèle élastoplastique, les écrouissages négatifs des seuils de traction et de compression ainsi que la cohésion du mortier sont pris en considération. La capacité des deux modèles pour reproduire le comportement avant et après le pic de la résistance au cisaillement du mur de maçonnerie est vérifiée en comparant les résultats numériques avec les données expérimentales. L'importance de l’interaction entre les seuils de compression et celui du cisaillement est montrée en comparant les résultats obtenus avec ceux d'un test réel. Les résultats ont révélé que le second modèle est capable de simuler le comportement du mur de maçonnerie avec une bonne précision. Ensuite, l'effet des propriétés géométriques de la paroi telles que l’existence d’une ouverture et l'élancement, les propriétés des mortiers comme la cohésion, la résistance en traction et la résistance en compression ainsi que la contrainte verticale initiale dans le mur, sur la résistance latérale et le mécanisme de rupture des murs de maçonnerie est démontré. En outre, afin de… Advisors/Committee Members: Modaressi, Arézou (thesis director).

Subjects/Keywords: Murs de maçonnerie non armée; Chargement en plane; Mécanisme de rupture; Unreinforced masonry walls; In-plane loading; Failure mechanism

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tabbakhha, M. (2013). Méthodologie multi-échelle pour évaluer la vulnérabilité des structures en maçonnerie : Multiscale methodology for vulnerability assessment of masonry structures. (Doctoral Dissertation). Châtenay-Malabry, Ecole centrale de Paris. Retrieved from http://www.theses.fr/2013ECAP0032

Chicago Manual of Style (16^th Edition):

Tabbakhha, Maryam. “Méthodologie multi-échelle pour évaluer la vulnérabilité des structures en maçonnerie : Multiscale methodology for vulnerability assessment of masonry structures.” 2013. Doctoral Dissertation, Châtenay-Malabry, Ecole centrale de Paris. Accessed January 16, 2021. http://www.theses.fr/2013ECAP0032.

MLA Handbook (7^th Edition):

Tabbakhha, Maryam. “Méthodologie multi-échelle pour évaluer la vulnérabilité des structures en maçonnerie : Multiscale methodology for vulnerability assessment of masonry structures.” 2013. Web. 16 Jan 2021.

Vancouver:

Tabbakhha M. Méthodologie multi-échelle pour évaluer la vulnérabilité des structures en maçonnerie : Multiscale methodology for vulnerability assessment of masonry structures. [Internet] [Doctoral dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2013. [cited 2021 Jan 16]. Available from: http://www.theses.fr/2013ECAP0032.

Council of Science Editors:

Tabbakhha M. Méthodologie multi-échelle pour évaluer la vulnérabilité des structures en maçonnerie : Multiscale methodology for vulnerability assessment of masonry structures. [Doctoral Dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2013. Available from: http://www.theses.fr/2013ECAP0032

Brno University of Technology

7. Novotný, Jan. Zakládací zařízení do víceetážové pekárenské pece: Loading device for multi-storey bakery oven.

Degree: 2020, Brno University of Technology

URL: http://hdl.handle.net/11012/191825

► This thesis is aimed at the design of a loading device for a multi-storey bakery oven, which is going to be located in a bread… (more)

Subjects/Keywords: Zakládací zařízení; dopravník; nůžkový mechanismus; hydraulická jednotka; potravinářské stroje; Loading device; conveyor; scissor mechanism; hydraulic unit; food prosessing machinery

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Novotný, J. (2020). Zakládací zařízení do víceetážové pekárenské pece: Loading device for multi-storey bakery oven. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/191825

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Novotný, Jan. “Zakládací zařízení do víceetážové pekárenské pece: Loading device for multi-storey bakery oven.” 2020. Thesis, Brno University of Technology. Accessed January 16, 2021. http://hdl.handle.net/11012/191825.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Novotný, Jan. “Zakládací zařízení do víceetážové pekárenské pece: Loading device for multi-storey bakery oven.” 2020. Web. 16 Jan 2021.

Vancouver:

Novotný J. Zakládací zařízení do víceetážové pekárenské pece: Loading device for multi-storey bakery oven. [Internet] [Thesis]. Brno University of Technology; 2020. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/11012/191825.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Novotný J. Zakládací zařízení do víceetážové pekárenské pece: Loading device for multi-storey bakery oven. [Thesis]. Brno University of Technology; 2020. Available from: http://hdl.handle.net/11012/191825

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

8. Fathi, Ali. Dégradation des aspérités des joints rocheux sous différentes conditions de chargement.

Degree: PhD, Génie civil, 2016, Université de Sherbrooke

URL: http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_8176.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/8176/8/Fathi_Ali_PhD_Civil_2015.pdf

► Résumé: L’objectif de cette thèse est d’interpréter la dégradation des aspérités des joints rocheux sous différentes conditions de chargement. Pour cela, la variation des aspérités… (more)

▼ Résumé: L’objectif de cette thèse est d’interpréter la dégradation des aspérités des joints rocheux sous différentes conditions de chargement. Pour cela, la variation des aspérités durant les différentes étapes du cisaillement d’un joint rocheux est observée. Selon le concept appelé “tiny windows”, une nouvelle méthodologie de caractérisation des épontes des joints a été développée. La méthodologie est basée sur les coordonnées tridimensionnelles de la surface des joints et elles sont mesurées après chaque essai. Après la reconstruction du modèle géométrique de la surface du joint, les zones en contact sont identifiées à travers la comparaison des hauteurs des “tiny windows” superposées. Ainsi, la distribution des zones de la surface en contact, endommagées et sans contact ont été identifiées. La méthode d’analyse d’image a été utilisée pour vérifier les résultats de la méthodologie proposée. Les résultats indiquent que cette méthode est appropriée pour déterminer la taille et la distribution des surfaces du joint en contact et endommagées à différentes étapes du cisaillement. Un ensemble de 38 répliques ont été préparées en coulant du mortier sans retrait sur une surface de fracture obtenue à partir d’un bloc de granite. Différentes conditions de chargement, incluant des chargements statiques et cycliques ont été appliquées afin d’étudier la dégradation des aspérités à différentes étapes du procédé de cisaillement. Les propriétés géométriques des “tiny windows” en contact en phase pré-pic, pic, post-pic et résiduelle ont été analysées en fonction de leurs angles et de leurs auteurs. Il a été remarqué que les facettes des aspérités faisant face à la direction de cisaillement jouent un rôle majeur dans le cisaillement. Aussi, il a été observé que les aspérités présentent différentes contributions dans le cisaillement. Les aspérités les plus aigües (“tiny windows” les plus inclinées) sont abîmées et les aspérités les plus plates glissent les unes sur les autres. Les aspérités d’angles intermédiaires sont définies comme “angle seuil endommagé” et “angle seuil en contact”. En augmentant la charge normale, les angles seuils diminuent d’une part et, d’autre part, le nombre de zones endommagées et en contact augmentent. Pour un petit nombre de cycles (avec faible amplitude et fréquence), indépendamment de l’amplitude, une contraction apparaît ; par conséquent, la surface en contact et les paramètres de résistance au cisaillement augmentent légèrement. Pour un grand nombre de cycles, la dégradation est observée à l’échelle des aspérités de second ordre, d’où une baisse des paramètres de résistance au cisaillement. Il a été aussi observée que les “tiny windows” avec différentes inclinaisons contribuent au processus de cisaillement, en plus des “tiny windows” les plus inclinées (aspérités plus aigües). Les résultats de la méthode proposée montrent que la différenciation entre les zones en contact et celles endommagées s’avère utile pour une meilleure compréhension du mécanisme de cisaillement des joints rocheux. Advisors/Committee Members: Rivard, Patrice, Ballivy, Gérard.

Subjects/Keywords: Joint rocheux; Mécanisme de cisaillement; Aspérités; Rugosité; Aire de contact; Aire endommagée; Petite fenêtre; Chargement cyclique; Chargement statique; Rock joints; Shear Mechanism; Asperities; Roughness; Contact Areas; Damaged Areas; Tiny windows; Cyclic loading; Monotonic loading

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fathi, A. (2016). Dégradation des aspérités des joints rocheux sous différentes conditions de chargement. (Doctoral Dissertation). Université de Sherbrooke. Retrieved from http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_8176.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/8176/8/Fathi_Ali_PhD_Civil_2015.pdf

Chicago Manual of Style (16^th Edition):

Fathi, Ali. “Dégradation des aspérités des joints rocheux sous différentes conditions de chargement.” 2016. Doctoral Dissertation, Université de Sherbrooke. Accessed January 16, 2021. http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_8176.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/8176/8/Fathi_Ali_PhD_Civil_2015.pdf.

MLA Handbook (7^th Edition):

Fathi, Ali. “Dégradation des aspérités des joints rocheux sous différentes conditions de chargement.” 2016. Web. 16 Jan 2021.

Vancouver:

Fathi A. Dégradation des aspérités des joints rocheux sous différentes conditions de chargement. [Internet] [Doctoral dissertation]. Université de Sherbrooke; 2016. [cited 2021 Jan 16]. Available from: http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_8176.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/8176/8/Fathi_Ali_PhD_Civil_2015.pdf.

Council of Science Editors:

Fathi A. Dégradation des aspérités des joints rocheux sous différentes conditions de chargement. [Doctoral Dissertation]. Université de Sherbrooke; 2016. Available from: http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_8176.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/8176/8/Fathi_Ali_PhD_Civil_2015.pdf

Université de Sherbrooke

9. Fathi, Ali. Dégradation des aspérités des joints rocheux sous différentes conditions de chargement.

Degree: 2016, Université de Sherbrooke

URL: http://hdl.handle.net/11143/8176

► Abstract: The objective of the current research is to interpret the asperity degradation of rock joints under different loading conditions. For this aim, the changes… (more)

▼ Abstract: The objective of the current research is to interpret the asperity degradation of rock joints under different loading conditions. For this aim, the changes of asperities during different stages of shearing in the three-dimensional joint surface are tracked. According to a concept named ‘tiny window’, a new methodology for the characterization of the joint surfaces was developed. The methodology is based on the three-dimensional coordinates of the joints surface that are captured before and after each test. After the reconstruction of geometric models of joint surface, in-contact areas were identified according to the height comparison of the face to face tiny windows. Therefore, the distribution and size of just in-contact areas, in-contact damaged areas and not in-contact areas are identified. Image analysis method was used to verify the results of the proposed method. The results indicated that the proposed method is suitable for determining the size and distribution of the contact and damaged areas at any shearing stage. A total of 38 replicas were prepared by pouring non-shrinking cement mortar on a fresh joint surface of a split granite block. Various loading conditions include monotonic and cyclic loading were applied to study the asperities degradation at different stages of shearing. The geometric properties of the in-contact tiny windows in the pre-peak, peak, post-peak softening and residual shearing stages were investigated based on their angle and height. It was found that those asperities facing the shear direction have the primary role in shearing. It is remarkable that different part of these asperities has their own special cooperation in shearing. The steepest parts (steeper tiny windows) are wore and the flatter parts (flatter tiny windows) are slid. The borderlines between these tiny windows defined as “damaged threshold angle” and “in-contact threshold angle”. By increasing normal load, both the amounts of threshold angles are decreased and contact and damaged areas increased. During low numbers of cycles (with low amplitude and frequency), independent of the type of cycle, contraction occurs and consequently the contact area and the shear strength parameters slightly increased. During larger number of cycles, degradation occurred on the second order asperities, therefore the shear strength parameters slowly decreased. It was also observed that tiny windows with different heights participate in the shearing process, not just the highest ones. The results of the proposed method indicated that considering differences between just in-contact areas and damaged areas provide useful insights into understanding the shear mechanism of rock joints. Advisors/Committee Members: Rivard, Patrice (advisor), Ballivy, Gérard (advisor).

Subjects/Keywords: Joint rocheux; Mécanisme de cisaillement; Aspérités; Rugosité; Aire de contact; Aire endommagée; Petite fenêtre; Chargement cyclique; Chargement statique; Rock joints; Shear Mechanism; Asperities; Roughness; Contact Areas; Damaged Areas; Tiny windows; Cyclic loading; Monotonic loading

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fathi, A. (2016). Dégradation des aspérités des joints rocheux sous différentes conditions de chargement. (Doctoral Dissertation). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/8176

Chicago Manual of Style (16^th Edition):

Fathi, Ali. “Dégradation des aspérités des joints rocheux sous différentes conditions de chargement.” 2016. Doctoral Dissertation, Université de Sherbrooke. Accessed January 16, 2021. http://hdl.handle.net/11143/8176.

MLA Handbook (7^th Edition):

Fathi, Ali. “Dégradation des aspérités des joints rocheux sous différentes conditions de chargement.” 2016. Web. 16 Jan 2021.

Vancouver:

Fathi A. Dégradation des aspérités des joints rocheux sous différentes conditions de chargement. [Internet] [Doctoral dissertation]. Université de Sherbrooke; 2016. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/11143/8176.

Council of Science Editors:

Fathi A. Dégradation des aspérités des joints rocheux sous différentes conditions de chargement. [Doctoral Dissertation]. Université de Sherbrooke; 2016. Available from: http://hdl.handle.net/11143/8176

10. ZHAO WEI. DYNAMIC CONTRACT WITH UNCERTAINTY.

Degree: 2016, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/125245

Subjects/Keywords: Mechanism Design; Bayesian Rule; Belief Discrepancy; Fixed Wage; Back-loading Bonus; Front-loading Bonus

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

WEI, Z. (2016). DYNAMIC CONTRACT WITH UNCERTAINTY. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/125245

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

WEI, ZHAO. “DYNAMIC CONTRACT WITH UNCERTAINTY.” 2016. Thesis, National University of Singapore. Accessed January 16, 2021. http://scholarbank.nus.edu.sg/handle/10635/125245.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

WEI, ZHAO. “DYNAMIC CONTRACT WITH UNCERTAINTY.” 2016. Web. 16 Jan 2021.

Vancouver:

WEI Z. DYNAMIC CONTRACT WITH UNCERTAINTY. [Internet] [Thesis]. National University of Singapore; 2016. [cited 2021 Jan 16]. Available from: http://scholarbank.nus.edu.sg/handle/10635/125245.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

WEI Z. DYNAMIC CONTRACT WITH UNCERTAINTY. [Thesis]. National University of Singapore; 2016. Available from: http://scholarbank.nus.edu.sg/handle/10635/125245

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

11. Ramdasi, Surabhi Suhas. Enhancement of a Rolling Resistance Rig for Force and Moment Testing of Tires.

Degree: MS, Mechanical Engineering, 2016, Virginia Tech

URL: http://hdl.handle.net/10919/71421

► Tire testing has been one of the important aspects of the tire industry because it helps identify the tire behavior which further helps in improving… (more)

Subjects/Keywords: tire testing machine; force and moment test; rolling resistance test; cleat test; tire positioning mechanism; loading mechanism

…loading mechanism utilized a dead weight system. Along with force and moment testing, this… …tire positioning mechanism and a loading mechanism - To be able to test passenger car tires… …adjust the slip and camber angle of the tire and a loading mechanism to apply the normal force… …the tire rolls over the cleat. The loading mechanism in the test setup needs to be rigid… …Angle Change - ± 15° Loading Mechanism Dead weights and Motor driven screw 14…

11 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ramdasi, S. S. (2016). Enhancement of a Rolling Resistance Rig for Force and Moment Testing of Tires. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/71421

Chicago Manual of Style (16^th Edition):

Ramdasi, Surabhi Suhas. “Enhancement of a Rolling Resistance Rig for Force and Moment Testing of Tires.” 2016. Masters Thesis, Virginia Tech. Accessed January 16, 2021. http://hdl.handle.net/10919/71421.

MLA Handbook (7^th Edition):

Ramdasi, Surabhi Suhas. “Enhancement of a Rolling Resistance Rig for Force and Moment Testing of Tires.” 2016. Web. 16 Jan 2021.

Vancouver:

Ramdasi SS. Enhancement of a Rolling Resistance Rig for Force and Moment Testing of Tires. [Internet] [Masters thesis]. Virginia Tech; 2016. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/10919/71421.

Council of Science Editors:

Ramdasi SS. Enhancement of a Rolling Resistance Rig for Force and Moment Testing of Tires. [Masters Thesis]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/71421

University of Oulu

12. Barua, B. (Bidushi). Incentivizing user participation in cooperative content delivery for wireless networks.

Degree: 2018, University of Oulu

URL: http://urn.fi/urn:isbn:9789526218953

►

Abstract The aim of this thesis is to propose an array of novel cooperative content delivery (CCD) methods and related incentive mechanisms for future fifth-generation… (more)

▼

Abstract The aim of this thesis is to propose an array of novel cooperative content delivery (CCD) methods and related incentive mechanisms for future fifth-generation (5G) and beyond networks. CCD using multiple air interfaces is a powerful solution to mitigate the problem of congestion in wireless networks, in which the available multiple air interfaces on smart devices are utilized intelligently to distribute data content among a group of users that are in the vicinity of one another. The requirements for higher capacity, reliability, and energy efficiency in the 5G networks have warranted the development of methods focusing on CCD. Moreover, critical to the efficiency of a CCD process are incentive mechanisms to induce cooperation among the mobile users engaged in CCD. The first part of the thesis studies an ideal condition of reliable and error-free distribution of content using cellular and short-range links. The main contribution is to introduce different device selection CCD methods that take into account only the link quality of the devices’ primary (cellular) interfaces. The proposed methods provide frequency carrier savings for the operator while allowing users to enjoy higher downlink rates. The second part of the thesis studies a more realistic CCD situation where users with low data rate wireless links can be a bottleneck in terms of CCD performance. The main contribution is to propose a novel device selection CCD method that considers the link quality of both primary (cellular) and secondary (short-range) interfaces of the devices. Additionally, a carrier aggregation-based incentive mechanism for the proposed method is introduced to address the challenge of selfish deviating users. The proposed mechanism maximizes individual and network payoffs, and is an equilibrium against unilateral selfish deviations. The third part of the thesis addresses the adverse selection problem in CCD scenarios. The operator is assumed to have incomplete information about the willingness of the users to participate in CCD. The main contribution is to introduce contract-based methods through which the operator could motivate users to reveal their true willingness towards participation. The proposed methods incentivize users according to their willingness and improve system performance in terms of the utility of the operator and the users.

Tiivistelmä Tämän väitöskirjan tavoitteena on kehittää menetelmiä yhteistyössä tapahtuvaan sisällön jakamiseen (cooperative content delivery, CCD) sekä siihen liittyviä kannustinmekanismeja viidennen sukupolven (5G) ja sen jälkeisille matkaviestinverkoille. CCD:n käyttö hyödyntämällä älylaitteessa olevia useita ilmarajapintoja on tehokas ratkaisu välttää langattomien verkkojen ruuhkautumista. CCD-menetelmissä laiteen ilmarajapintoja käytetään älykkäästi datan jakamiseen käyttäjäryhmälle, kun käyttäjät ovat lähellä toisiaan. 5G-verkkojen vaatimukset korkeammalle kapasiteetille, luotettavuudelle ja energiatehokkuudelle ovat motivoineet CCD-menetelmien kehitystyötä. Erityisen tärkeää…

Advisors/Committee Members: Latva-aho, M. (Matti).

Subjects/Keywords: WLAN; adverse selection; air interface; carrier aggregation; cellular networks; contract theory; cooperative content delivery; game theory; incentive mechanism; off-loading; haitallinen valikoituminen; ilmarajapinta; kannustinmekanismi; kantoaaltojen yhdistäminen; kuorman jakaminen; langaton lähiverkko; peliteoria; solukkoverkot; sopimusteoria; yhteistyössä tapahtuva sisällön jakaminen

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Barua, B. (. (2018). Incentivizing user participation in cooperative content delivery for wireless networks. (Doctoral Dissertation). University of Oulu. Retrieved from http://urn.fi/urn:isbn:9789526218953

Chicago Manual of Style (16^th Edition):

Barua, B (Bidushi). “Incentivizing user participation in cooperative content delivery for wireless networks.” 2018. Doctoral Dissertation, University of Oulu. Accessed January 16, 2021. http://urn.fi/urn:isbn:9789526218953.

MLA Handbook (7^th Edition):

Barua, B (Bidushi). “Incentivizing user participation in cooperative content delivery for wireless networks.” 2018. Web. 16 Jan 2021.

Vancouver:

Barua B(. Incentivizing user participation in cooperative content delivery for wireless networks. [Internet] [Doctoral dissertation]. University of Oulu; 2018. [cited 2021 Jan 16]. Available from: http://urn.fi/urn:isbn:9789526218953.

Council of Science Editors:

Barua B(. Incentivizing user participation in cooperative content delivery for wireless networks. [Doctoral Dissertation]. University of Oulu; 2018. Available from: http://urn.fi/urn:isbn:9789526218953

University of Western Ontario

13. El Sharnouby, Mahmoud Meckkey M. Monotonic and Cyclic Behaviour of Steel Fibre-Reinforced and FRP-Steel Fibre-Reinforced Helical Pulldown Micropiles.

Degree: 2012, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/902

► Helical piles are a deep foundation system that can be used to support pipelines, telecommunication and transmission towers, and low- and medium-rise buildings. Advantages of… (more)

▼ Helical piles are a deep foundation system that can be used to support pipelines, telecommunication and transmission towers, and low- and medium-rise buildings. Advantages of helical piles include: short installation time with minimal noise and vibration levels; can be installed with ease in limited accessibility site; and onsite quality control by measurement of installation torque. The main objective of the current research is to assess the performance of steel fibre-reinforced helical pulldown micropiles (RHPM), and fibre-reinforced polymer-steel fibre- reinforced pulldown micropiles (FRP-RHPM) under axial and lateral monotonic and cyclic loading conditions. The research methodology involved conducting full scale field testing on: one plain helical pile, 12 RHPM and 12 FRP-RHPM. Piles were subjected to axial static and one-way cyclic loading, and lateral static and two-way cyclic loading. The axial test results were then used to calibrate a three-dimensional finite element model. To calibrate the lateral test results, moment-rigidity curves for the tested piles were generated through three-dimensional finite element models. Along with test results, these curves were used to calibrate a finite difference model. The experimental investigation under axial loads shows that these pile systems behave as composite pile systems. The grout shaft significantly improves the helical pile axial performance. Cyclic loads resulted in degradation of the shaft resistance, however, resulted in an improvement of the lead section resistance. The overall pile cyclic response was found to stabilize after a few cycles of loading. Finally, the cyclic loading was found to improve the axial capacity of these systems. The experimental investigation under lateral loads shows that the grout shaft and/or the FRP sleeve significantly improve the plain helical pile lateral performance and ductility. Two-way cyclic loading resulted in overall degradation in pile stiffness and capacity. A design procedure for FRP-RHPM and RHPM under axial compression loading conditions is presented. For the lateral direction, a series of design charts that can be used in conjunction with available numerical programs to design such systems are provided. In general, the RHPM and FRP-RHPM are viable foundation options for axial and lateral monotonic and cyclic loading applications.

Subjects/Keywords: Helical piles; Pulldown micropile; FRP; Steel-fibres; Full-scale field testing; Axial and lateral testing; monotonic and cyclic loading; Load transfer mechanism; Pile capacity; Numerical modelling.; Civil Engineering; Computational Engineering; Construction Engineering and Management; Geotechnical Engineering

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APA (6^th Edition):

El Sharnouby, M. M. M. (2012). Monotonic and Cyclic Behaviour of Steel Fibre-Reinforced and FRP-Steel Fibre-Reinforced Helical Pulldown Micropiles. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/902

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

El Sharnouby, Mahmoud Meckkey M. “Monotonic and Cyclic Behaviour of Steel Fibre-Reinforced and FRP-Steel Fibre-Reinforced Helical Pulldown Micropiles.” 2012. Thesis, University of Western Ontario. Accessed January 16, 2021. https://ir.lib.uwo.ca/etd/902.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

El Sharnouby, Mahmoud Meckkey M. “Monotonic and Cyclic Behaviour of Steel Fibre-Reinforced and FRP-Steel Fibre-Reinforced Helical Pulldown Micropiles.” 2012. Web. 16 Jan 2021.

Vancouver:

El Sharnouby MMM. Monotonic and Cyclic Behaviour of Steel Fibre-Reinforced and FRP-Steel Fibre-Reinforced Helical Pulldown Micropiles. [Internet] [Thesis]. University of Western Ontario; 2012. [cited 2021 Jan 16]. Available from: https://ir.lib.uwo.ca/etd/902.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

El Sharnouby MMM. Monotonic and Cyclic Behaviour of Steel Fibre-Reinforced and FRP-Steel Fibre-Reinforced Helical Pulldown Micropiles. [Thesis]. University of Western Ontario; 2012. Available from: https://ir.lib.uwo.ca/etd/902

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

14. Cabrol, Elodie. Étude et compréhension des mécanismes d'endommagement de surface de matrices de forgeage à chaud rechargées : Assessment of surface damage mechanisms of hardfaced hot forging dies.

Degree: Docteur es, Génie mécanique, mécanique des matériaux, 2015, Ecole nationale des Mines d'Albi-Carmaux

URL: http://www.theses.fr/2015EMAC0012

►

Dans le domaine du forgeage à chaud de pièces aéronautiques, les matrices en acier sont couramment rechargées, sur quelques millimètres d’épaisseur, par un alliage base… (more)

▼

Dans le domaine du forgeage à chaud de pièces aéronautiques, les matrices en acier sont couramment rechargées, sur quelques millimètres d’épaisseur, par un alliage base cobalt (Stellite 21) déposé par procédé de soudage à l’arc (MIG). Dans le cadre de ce travail de thèse, ce rechargement « classique» est comparé à des rechargements Stellite 21 et Stellite 6 déposés par deux procédés émergents dans ce domaine, le PTA et le LASER. L’objectif est d’apporter des éléments de compréhension aux mécanismes d’endommagement de surface, notamment par écoulement plastique, de ces différents rechargements afin de dégager des voies d’amélioration pour augmenter la durée de vie des matrices. Pour cela, des essais tribologiques (semi-industriels et laboratoire) ont été mis en œuvre pour créer des endommagements de surface comparables à ceux observés sur matrices industrielles. Associées à ces essais, des investigations microstructurales, structurales et mécaniques multi-échelles ont été réalisées (traction, flexion, microdureté, MO, MEB, MEB-STEM, DRX, EBSD). Selon les couples « nuance/procédé » de rechargement, des mécanismes de déformation plastique par glissement des dislocations parfaites et par transformation de phase CFC en HC ont été identifiés. L’activation de ce dernier a pu être reliée à la température de transformation allotropique CFC/HC du cobalt. Cette température dépend à la fois (i) des éléments d’addition, variant en fonction de la nuance déposée (Cr, C,...), (ii) de la dilution (variation de la teneur en Fe) liée aux paramètres de soudage et (iii) du nombre de couches déposées. De plus, une influence significative de la transformation de phase sur l’évolution du coefficient de frottement a été mise en évidence. En effet, dans le cas où la transformation de phase n’est pas observée, le coefficient de frottement est stable durant l'essai alors qu'une chute de la courbe de coefficient de frottement a été reliée avec la transformation de phase CFC en HC. Parallèlement, l'écoulement plastique des dendrites est observé en extrême surface sur quelques dizaines de micromètre d'épaisseur dans la direction de glissement. Cet écoulement est associé à une forte texturation morphologique et cristallographique de la phase identifiée (CFC ou HC), avec une orientation des plans de plus grande densité atomique parallèlement à la surface de glissement. Les résultats montrent également que sous sollicitations tribologiques, un important durcissement est observé en surface (jusqu'à 90%) et une corrélation a pu être établie entre l'augmentation de la microdureté et le taux de déformation plastique.

In the field of hot forging of aeronautical parts, the steel dies are commonly hardfaced, on few millimeters thick, by a cobalt-based alloy (Stellite 21) deposited by arc welding (MIG). As part of this thesis, this "classic" hardfacing is compared to Stellite 21 and Stellite 6 hardfacings deposited by two emerging processes in this area, the PTA and the LASER one. The objective is to assess surface damage mechanisms, especially induced by…

Advisors/Committee Members: Rézaï-Aria, Farhad (thesis director), Boher, Christine (thesis director), Vidal, Vanessa (thesis director).

Subjects/Keywords: Endommagement de surface; Usure outillage; Mécanisme de déformation plastique; Forgeage à chaud; Sollicitation tribologique et thermomécanique; Rechargement; Procédé de dépôt (MIG PTA Laser); Alliage base cobalt (Stellite); Transformation de phase; Surface damage; Tool wear; Plastic strain mechanism; Hot forging; Tribological and thermomechanical loading; Hardfacing; Deposition process (MIG PTA Laser); Cobalt-based alloy (Stellite); Phase transformation; 620.1

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cabrol, E. (2015). Étude et compréhension des mécanismes d'endommagement de surface de matrices de forgeage à chaud rechargées : Assessment of surface damage mechanisms of hardfaced hot forging dies. (Doctoral Dissertation). Ecole nationale des Mines d'Albi-Carmaux. Retrieved from http://www.theses.fr/2015EMAC0012

Chicago Manual of Style (16^th Edition):

Cabrol, Elodie. “Étude et compréhension des mécanismes d'endommagement de surface de matrices de forgeage à chaud rechargées : Assessment of surface damage mechanisms of hardfaced hot forging dies.” 2015. Doctoral Dissertation, Ecole nationale des Mines d'Albi-Carmaux. Accessed January 16, 2021. http://www.theses.fr/2015EMAC0012.

MLA Handbook (7^th Edition):

Cabrol, Elodie. “Étude et compréhension des mécanismes d'endommagement de surface de matrices de forgeage à chaud rechargées : Assessment of surface damage mechanisms of hardfaced hot forging dies.” 2015. Web. 16 Jan 2021.

Vancouver:

Cabrol E. Étude et compréhension des mécanismes d'endommagement de surface de matrices de forgeage à chaud rechargées : Assessment of surface damage mechanisms of hardfaced hot forging dies. [Internet] [Doctoral dissertation]. Ecole nationale des Mines d'Albi-Carmaux; 2015. [cited 2021 Jan 16]. Available from: http://www.theses.fr/2015EMAC0012.

Council of Science Editors:

Cabrol E. Étude et compréhension des mécanismes d'endommagement de surface de matrices de forgeage à chaud rechargées : Assessment of surface damage mechanisms of hardfaced hot forging dies. [Doctoral Dissertation]. Ecole nationale des Mines d'Albi-Carmaux; 2015. Available from: http://www.theses.fr/2015EMAC0012

University of Cincinnati

15. Yang, Chunping. Rotating Drum Biofiltration.

Degree: PhD, Engineering : Environmental Engineering, 2004, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092668752

► Biofiltration has developed into a promising technology for the abatement of volatile organic compounds (VOCs), odors, and hazardous air pollutants in waste gas streams. Many… (more)

▼ Biofiltration has developed into a promising technology for the abatement of volatile organic compounds (VOCs), odors, and hazardous air pollutants in waste gas streams. Many factors, however, are still creating an environment for greater innovation as well as new products for biofiltration processes. Rotating drum biofilters (RDBs) are such an innovation. The objectives of this investigation are to develop and understand RDBs and consequently to design and operate RDBs properly. Three RDBs, a single-layer RDB, a multi-layer RDB, and a hybrid RDB, were developed and evaluated at various design and operation conditions in this investigation. Spongy medium that was used to support the biofilms was mounted on a cylindrical drum frame that was rotated at a preset speed. Diethyl ether, toluene, and hexane were chosen as the model VOC. Results showed that the RDBs were readily started up and removed VOCs with high water solubility and a low value of Henry' constant efficiently with more than 6 month duration without any biomass control measures. The single-layer and hybrid RDBs usually reach the lowest and highest VOC removal efficiency. VOC removal efficiency decreased with increased VOC loading rate and decreased gas empty contact time (EBCT). Nitrate in the liquid phase of the RDBs can be rate-limiting for diethyl ether removal. With increased drum rotating speed, the change in VOC removal efficiency depends on VOC properties, VOC loading rate, drum rotating speed value, and biofilter configurations. The microbial community structure along medium depth are almost identical for each of the RDBs , however, the structure changes with the operation conditions and biofilter configuration. Review of the biomass accumulation rates among different layers reveals four biomass accumulation patterns which represent different removal mechanisms: surface biofiltration, in-depth biofiltration, shallow biofiltration, and reverse biofiltration. The dominant biomass accumulation pattern in an RDB can be predicted and can, to a certain extent, be controlled. Mechanism-based procedures for biofilter design and operation are consequently proposed. The outcome of this research is critical for understanding the rotating drum biofiltration, properly designing and operating RDBs, and consequently rendering RDBs cost-effective for the control of VOC emissions. Advisors/Committee Members: Suidan, Dr. Makram (Advisor).

Subjects/Keywords: Engineering, Environmental; biodegradation; biofilm; biofilter; biofiltration; biomass; design; DGGE; empty bed contact time; foam medium; microbial community structure; nitrate; operation; organic loading rate; PCR; removal mechanism; rotating drum biofilter; rotating speed

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APA (6^th Edition):

Yang, C. (2004). Rotating Drum Biofiltration. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092668752

Chicago Manual of Style (16^th Edition):

Yang, Chunping. “Rotating Drum Biofiltration.” 2004. Doctoral Dissertation, University of Cincinnati. Accessed January 16, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092668752.

MLA Handbook (7^th Edition):

Yang, Chunping. “Rotating Drum Biofiltration.” 2004. Web. 16 Jan 2021.

Vancouver:

Yang C. Rotating Drum Biofiltration. [Internet] [Doctoral dissertation]. University of Cincinnati; 2004. [cited 2021 Jan 16]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092668752.

Council of Science Editors:

Yang C. Rotating Drum Biofiltration. [Doctoral Dissertation]. University of Cincinnati; 2004. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092668752

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