subject:(Structures AND Materials)

Embry-Riddle Aeronautical University

1. Waelchli, Robert. A Novel Magnetorheological Fluid Damper for a Small Spacecraft with Flexible Appendages.

Degree: MSin Mechanical Engineering, Mechanical Engineering, 2018, Embry-Riddle Aeronautical University

► Small satellites have become increasingly popular over the past thirty years, particularly since the adoption of the common CubeSat architecture early this century. Because… (more)

Subjects/Keywords: Space Vehicles; Structures and Materials

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APA (6^th Edition):

Waelchli, R. (2018). A Novel Magnetorheological Fluid Damper for a Small Spacecraft with Flexible Appendages. (Masters Thesis). Embry-Riddle Aeronautical University. Retrieved from https://commons.erau.edu/edt/391

Chicago Manual of Style (16^th Edition):

Waelchli, Robert. “A Novel Magnetorheological Fluid Damper for a Small Spacecraft with Flexible Appendages.” 2018. Masters Thesis, Embry-Riddle Aeronautical University. Accessed September 22, 2019. https://commons.erau.edu/edt/391.

MLA Handbook (7^th Edition):

Waelchli, Robert. “A Novel Magnetorheological Fluid Damper for a Small Spacecraft with Flexible Appendages.” 2018. Web. 22 Sep 2019.

Vancouver:

Waelchli R. A Novel Magnetorheological Fluid Damper for a Small Spacecraft with Flexible Appendages. [Internet] [Masters thesis]. Embry-Riddle Aeronautical University; 2018. [cited 2019 Sep 22]. Available from: https://commons.erau.edu/edt/391.

Council of Science Editors:

Waelchli R. A Novel Magnetorheological Fluid Damper for a Small Spacecraft with Flexible Appendages. [Masters Thesis]. Embry-Riddle Aeronautical University; 2018. Available from: https://commons.erau.edu/edt/391

Embry-Riddle Aeronautical University

2. Schmidt, Ryan C. An Intelligible Software (CFA) Approach for Fiber-Reinforced Laminate Failure Analysis Including a Piecewise Representation of the Tsai-Wu Failure Criterion Using Excel and MatLab.

Degree: MSin Aerospace Engineering, Aerospace Engineering, 2009, Embry-Riddle Aeronautical University

URL: http://commons.erau.edu/db-theses/182

► Present generations rely heavily on the use of petroleum as their primary means of transportation. As the cost of petroleum continues to escalate, the… (more)

▼ Present generations rely heavily on the use of petroleum as their primary means of transportation. As the cost of petroleum continues to escalate, the need for lightweight structures for vehicle applications becomes more evident. The ability to engineer materials so that they possess desired application specific properties and characteristics has made tremendous progress in the past century. Consequently, the use of these composite materials for aircraft weight reduction has been investigated for decades. The aerospace industry often uses composite materials to make a laminated composite structure where each constituent ply of the laminate has its own material properties. This anisotropic behavior of a fiber-reinforced laminate (FRL) is discussed methodically throughout this research. Moreover, the successful design of an FRL is dependent upon the accuracy of analyzing its structural limits. Therefore, the failure criteria used to specify an FRL's failure limits are significant. Although useful formulaic methods have been developed for analyzing fiber-reinforced laminates, these calculations can be quite tedious when used in an iterative structural design process. Development of software that can conduct computer-aided laminate failure analysis can provide an indispensable tool for the design of fiber-reinforced laminate composites. Hence, this research focuses on the development of such software, CFA (Composite Failure Analysis). Even though fiber-reinforced laminate failure analysis is not a trivial topic, CFA was developed to provide a knowledgeable engineer with an intelligible software utensil for the design of fiber-reinforced laminates. Additionally, CFA's simplistic exploitation of Excel® and MatLab® make it an indispensable tool for engineering education instruction. CFA exhibits an immense potential for the advancement of Embry-Riddle Aeronautical University's educational prowess in the field of composite materials. With its ability to perform fiber-reinforced laminate failure analysis using the universal engineering software platforms of Excel® and MatLab®, CFA provides the university with a novel capability for future composite materials research. Advisors/Committee Members: Dr. Yi Zhao, Dr. Magdy Attia, Dr. Frank Radosta.

Subjects/Keywords: Aerospace Engineering; Structures and Materials

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APA (6^th Edition):

Schmidt, R. C. (2009). An Intelligible Software (CFA) Approach for Fiber-Reinforced Laminate Failure Analysis Including a Piecewise Representation of the Tsai-Wu Failure Criterion Using Excel and MatLab. (Masters Thesis). Embry-Riddle Aeronautical University. Retrieved from http://commons.erau.edu/db-theses/182

Chicago Manual of Style (16^th Edition):

Schmidt, Ryan C. “An Intelligible Software (CFA) Approach for Fiber-Reinforced Laminate Failure Analysis Including a Piecewise Representation of the Tsai-Wu Failure Criterion Using Excel and MatLab.” 2009. Masters Thesis, Embry-Riddle Aeronautical University. Accessed September 22, 2019. http://commons.erau.edu/db-theses/182.

MLA Handbook (7^th Edition):

Schmidt, Ryan C. “An Intelligible Software (CFA) Approach for Fiber-Reinforced Laminate Failure Analysis Including a Piecewise Representation of the Tsai-Wu Failure Criterion Using Excel and MatLab.” 2009. Web. 22 Sep 2019.

Vancouver:

Schmidt RC. An Intelligible Software (CFA) Approach for Fiber-Reinforced Laminate Failure Analysis Including a Piecewise Representation of the Tsai-Wu Failure Criterion Using Excel and MatLab. [Internet] [Masters thesis]. Embry-Riddle Aeronautical University; 2009. [cited 2019 Sep 22]. Available from: http://commons.erau.edu/db-theses/182.

Council of Science Editors:

Schmidt RC. An Intelligible Software (CFA) Approach for Fiber-Reinforced Laminate Failure Analysis Including a Piecewise Representation of the Tsai-Wu Failure Criterion Using Excel and MatLab. [Masters Thesis]. Embry-Riddle Aeronautical University; 2009. Available from: http://commons.erau.edu/db-theses/182

University of Oklahoma

3. Drury, Jonathan. Shear Performance of Non-Traditional Concrete.

Degree: PhD, 2018, University of Oklahoma

URL: http://hdl.handle.net/11244/301339

► Concrete is the second most consumed material in the world, second only to water. Concrete has been around in different forms for centuries, and science… (more)

▼ Concrete is the second most consumed material in the world, second only to water. Concrete has been around in different forms for centuries, and science and technology continually push the previously believed limits. Two such types of concrete are self-consolidating concrete (SCC) and cement-limiting concrete. While each is vastly different from the other, they present similar problems to designers and engineers. Practitioners have implemented new technologies such as fiber reinforcement to combat issues with these concretes, but the overall behavior and internal mechanism of these concretes are not thoroughly understood. This study investigated the shear behavior of seven different concrete types: conventional concrete with micro-fibers, conventional concrete with micro-fibers and macro-fibers, cement-limiting concrete, cement-limiting concrete with micro-fibers, cement-limiting concrete with micro-fibers and macro-fibers, SCC, SCC with macro-fibers, and compared their behavior to the behavior of conventional concrete. Additionally, a newly proposed push-off test method was developed, investigated, and compared to historic methods. The experimental programs consisted of 15 full-scale shear beams without shear reinforcement in the test regions (3 with conventional concrete, 6 with cement-limiting concrete, and 6 with SCC), 24 push-off specimens (3 for each of the eight concrete mixtures investigated), and many small-scale specimens to capture the fresh and hardened properties of the concrete mixtures. The shear beams were tested under a simply supported four-point loading condition. Results of this study showed that fiber reinforced concrete has more variable performance, but that fiber reinforcement can mitigate the negative performance aspects of SCC and cement-limiting concrete. It was shown that micro-fibers amplified the cohesion performance of existing concrete matrixes, but that macro-fiber tend to govern the performance of a concrete mixture. It was shown than that the optimized gradation of the cement-limiting concrete provided the highest aggregate interlock, but that aggregate interlock is not the best predictor of shear transfer performance between two concrete surfaces. Lastly, this study showed that the proposed push-off test is not only an acceptable method for analyzing aggregate interlock, but it is an improvement due to the ability to obtain more data from it, improved quality control, simplified analysis, and repeatability of the outcomes. Advisors/Committee Members: Volz, Jeffery (advisor), Floyd, Royce (committee member), Harvey, P. Scott (committee member), Ramseyer, Christopher (committee member), Shadravan, Shideh (committee member).

Subjects/Keywords: Civil Engineering Materials Structures

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APA (6^th Edition):

Drury, J. (2018). Shear Performance of Non-Traditional Concrete. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/301339

Chicago Manual of Style (16^th Edition):

Drury, Jonathan. “Shear Performance of Non-Traditional Concrete.” 2018. Doctoral Dissertation, University of Oklahoma. Accessed September 22, 2019. http://hdl.handle.net/11244/301339.

MLA Handbook (7^th Edition):

Drury, Jonathan. “Shear Performance of Non-Traditional Concrete.” 2018. Web. 22 Sep 2019.

Vancouver:

Drury J. Shear Performance of Non-Traditional Concrete. [Internet] [Doctoral dissertation]. University of Oklahoma; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/11244/301339.

Council of Science Editors:

Drury J. Shear Performance of Non-Traditional Concrete. [Doctoral Dissertation]. University of Oklahoma; 2018. Available from: http://hdl.handle.net/11244/301339

University of Ottawa

4. Hayles, Meika. Investigation Into the Mechanical Properties and Structural Behaviour of Recycled Concrete Members .

Degree: 2018, University of Ottawa

URL: http://hdl.handle.net/10393/37801

► Recycled concrete aggregates (RCA) are an eco-sustainable alternative to traditional aggregates. The equivalent mortar volume method has been developed to design RCA concrete with comparable… (more)

Subjects/Keywords: Concrete; Sustainability; Materials; Cement; Structures

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APA (6^th Edition):

Hayles, M. (2018). Investigation Into the Mechanical Properties and Structural Behaviour of Recycled Concrete Members . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/37801

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):

Hayles, Meika. “Investigation Into the Mechanical Properties and Structural Behaviour of Recycled Concrete Members .” 2018. Thesis, University of Ottawa. Accessed September 22, 2019. http://hdl.handle.net/10393/37801.

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

MLA Handbook (7^th Edition):

Hayles, Meika. “Investigation Into the Mechanical Properties and Structural Behaviour of Recycled Concrete Members .” 2018. Web. 22 Sep 2019.

Vancouver:

Hayles M. Investigation Into the Mechanical Properties and Structural Behaviour of Recycled Concrete Members . [Internet] [Thesis]. University of Ottawa; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/10393/37801.

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

Council of Science Editors:

Hayles M. Investigation Into the Mechanical Properties and Structural Behaviour of Recycled Concrete Members . [Thesis]. University of Ottawa; 2018. Available from: http://hdl.handle.net/10393/37801

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

University of Cambridge

5. St-Pierre, Luc. The quasi-static and dynamic responses of metallic sandwich structures.

Degree: PhD, 2012, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/243443 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553217

► Lattice materials are used as the core of sandwich panels to construct light and strong structures. This thesis focuses on metallic sandwich structures and has… (more)

▼ Lattice materials are used as the core of sandwich panels to construct light and strong structures. This thesis focuses on metallic sandwich structures and has two main objectives: (i) explore how a surface treatment can improve the strength of a lattice material and (ii) investigate the collapse response of two competing prismatic sandwich cores employed in ship hulls. First, the finite element method is used to examine the effect of carburisation and strain hardening upon the compressive response of a pyramidal lattice made from hollow tubes or solid struts. The carburisation surface treatment increases the yield strength of the material, but its effects on pyramidal lattices are not known. Here, it is demonstrated that carburisation increases the plastic buckling strength of the lattice and reduces the slenderness ratio at which the transition from plastic to elastic buckling occurs. The predictions also showed that strain hardening increases the compressive strength of stocky lattices with a slenderness ratio inferior to ten, but without affecting the collapse mode of the lattice. Second, the quasi-static three-point bending responses of simply supported and clamped sandwich beams with a corrugated core or a Y-frame core are compared via experiments and finite element simulations. The role of the face-sheets is assessed by considering beams with (i) front-and-back faces present and (ii) front face present, but back face absent. These two beam designs are used to represent single hull and double hull ship structures, and they are compared on an equal mass basis by doubling the thickness of the front face when the back face is absent. Beams with a corrugated core are found to be slightly stronger than those with a Y-frame core, and two collapse mechanisms are identified depending upon beam span. Short beams collapse by indentation and for this collapse mechanism, beams without a back face outperform those with front-and back faces present. In contrast, longbeams fail by Brazier plastic buckling and for this collapse mechanism, the presence of a back face strengthens the beam. Third, drop weight tests with an impact velocity of 5 m/s are performed on simply supported and clamped sandwich beams with a corrugated core or a Y-frame core. These tests are conducted to mimic the response of a sandwich hull in a ship collision. The responses measured at 5 m/s are found to be slightly stronger than those measured quasi-statically. The measurements are in reasonable agreement with finite element predictions. In addition, the finite element method is used to investigate whether the collapse mechanism at 5 m/s is different from the one obtained quasi-statically. The predictions indicate that sandwich beams that collapse quasi-statically by indentation also fail by indentation at 5 m/s. In contrast, the simulations for beams that fail quasi-statically by Brazier plastic buckling show that they collapse by indentation at 5 m/s. Finally, the dynamic indentation response of sandwich panels with a corrugated core or a Y-frame core…

Subjects/Keywords: 620; Sandwich structures; Lattice materials

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APA (6^th Edition):

St-Pierre, L. (2012). The quasi-static and dynamic responses of metallic sandwich structures. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/243443 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553217

Chicago Manual of Style (16^th Edition):

St-Pierre, Luc. “The quasi-static and dynamic responses of metallic sandwich structures.” 2012. Doctoral Dissertation, University of Cambridge. Accessed September 22, 2019. https://www.repository.cam.ac.uk/handle/1810/243443 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553217.

MLA Handbook (7^th Edition):

St-Pierre, Luc. “The quasi-static and dynamic responses of metallic sandwich structures.” 2012. Web. 22 Sep 2019.

Vancouver:

St-Pierre L. The quasi-static and dynamic responses of metallic sandwich structures. [Internet] [Doctoral dissertation]. University of Cambridge; 2012. [cited 2019 Sep 22]. Available from: https://www.repository.cam.ac.uk/handle/1810/243443 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553217.

Council of Science Editors:

St-Pierre L. The quasi-static and dynamic responses of metallic sandwich structures. [Doctoral Dissertation]. University of Cambridge; 2012. Available from: https://www.repository.cam.ac.uk/handle/1810/243443 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553217

Cal Poly

6. Litzinger, Marlee K. Atomic Oxygen Effects on Particulate Contamination and Short Beam Strength of Carbon Composites.

Degree: MS, Aerospace Engineering, 2019, Cal Poly

URL: https://digitalcommons.calpoly.edu/theses/2043

► In order to design a successful space system, the unique challenges of the space environment it will operate in must be considered during the… (more)

Subjects/Keywords: Atomic Oxygen; Structures and Materials

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APA (6^th Edition):

Litzinger, M. K. (2019). Atomic Oxygen Effects on Particulate Contamination and Short Beam Strength of Carbon Composites. (Masters Thesis). Cal Poly. Retrieved from https://digitalcommons.calpoly.edu/theses/2043

Chicago Manual of Style (16^th Edition):

Litzinger, Marlee K. “Atomic Oxygen Effects on Particulate Contamination and Short Beam Strength of Carbon Composites.” 2019. Masters Thesis, Cal Poly. Accessed September 22, 2019. https://digitalcommons.calpoly.edu/theses/2043.

MLA Handbook (7^th Edition):

Litzinger, Marlee K. “Atomic Oxygen Effects on Particulate Contamination and Short Beam Strength of Carbon Composites.” 2019. Web. 22 Sep 2019.

Vancouver:

Litzinger MK. Atomic Oxygen Effects on Particulate Contamination and Short Beam Strength of Carbon Composites. [Internet] [Masters thesis]. Cal Poly; 2019. [cited 2019 Sep 22]. Available from: https://digitalcommons.calpoly.edu/theses/2043.

Council of Science Editors:

Litzinger MK. Atomic Oxygen Effects on Particulate Contamination and Short Beam Strength of Carbon Composites. [Masters Thesis]. Cal Poly; 2019. Available from: https://digitalcommons.calpoly.edu/theses/2043

Michigan Technological University

7. Shen, Michael. MILITARY ASSAULT BRIDGING STRUCTURAL ANALYSIS AND LOAD TESTING.

Degree: PhD, Department of Mechanical Engineering-Engineering Mechanics, 2017, Michigan Technological University

URL: http://digitalcommons.mtu.edu/etdr/465

► Armored Vehicle Launched Bridge (AVLB) has been analyzed on its load carrying capacity and stability of bracing with theoretical computation, FEA simulation and full-size… (more)

Subjects/Keywords: structures; Aerospace Engineering; Automotive Engineering; Structures and Materials

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APA (6^th Edition):

Shen, M. (2017). MILITARY ASSAULT BRIDGING STRUCTURAL ANALYSIS AND LOAD TESTING. (Doctoral Dissertation). Michigan Technological University. Retrieved from http://digitalcommons.mtu.edu/etdr/465

Chicago Manual of Style (16^th Edition):

Shen, Michael. “MILITARY ASSAULT BRIDGING STRUCTURAL ANALYSIS AND LOAD TESTING.” 2017. Doctoral Dissertation, Michigan Technological University. Accessed September 22, 2019. http://digitalcommons.mtu.edu/etdr/465.

MLA Handbook (7^th Edition):

Shen, Michael. “MILITARY ASSAULT BRIDGING STRUCTURAL ANALYSIS AND LOAD TESTING.” 2017. Web. 22 Sep 2019.

Vancouver:

Shen M. MILITARY ASSAULT BRIDGING STRUCTURAL ANALYSIS AND LOAD TESTING. [Internet] [Doctoral dissertation]. Michigan Technological University; 2017. [cited 2019 Sep 22]. Available from: http://digitalcommons.mtu.edu/etdr/465.

Council of Science Editors:

Shen M. MILITARY ASSAULT BRIDGING STRUCTURAL ANALYSIS AND LOAD TESTING. [Doctoral Dissertation]. Michigan Technological University; 2017. Available from: http://digitalcommons.mtu.edu/etdr/465

Hong Kong University of Science and Technology

8. Yang, Meng. Bacterial behavior on honeycomb patterned surfaces.

Degree: 2013, Hong Kong University of Science and Technology

URL: https://doi.org/10.14711/thesis-b1255095 ; http://repository.ust.hk/ir/bitstream/1783.1-62656/1/th_redirect.html

► The adhesion of bacteria to medical implants forming biofilms might lead to healthcare-associated infections. Initial bacterial adhesion is mediated by material surface properties. Therefore, control… (more)

▼ The adhesion of bacteria to medical implants forming biofilms might lead to healthcare-associated infections. Initial bacterial adhesion is mediated by material surface properties. Therefore, control of bacterial adhesion to material surfaces is important for reducing infection. Numerous researches have been devoted to the chemical and physical modification of biomaterial surfaces to control initial bacterial adhesion. However, the successful design of biomaterials for the treatment of infections remains a challenge. Surface topographic patterns of micro- or nano-scale have been effective to manipulate behavior of different types of cells. Previously, the bacterial behavior on the micro-pillar patterned surfaces has been studied in our group and confirmed that the micro-pillar pattern do have effects on the bacterial behavior. Now in this study we further fabricated a honeycomb pattern which provided a reduced continuous surface area compared with micro-pillar pattern. The honeycomb patterns on silicon substrate with characteristic dimensions varied from 0.5 μm to 10 μm were fabricated. Two typical bacteria with distinctive shapes (E.coli and S.aureus) were used as study models. After culturing the samples with bacteria, the effects of honeycomb patterns on the bacterial adhesion, growth, proliferation and viability were investigated. Experimental results show that the honeycomb topography with specific feature size around 1 μm can significantly reduce bacterial adhesion. Furthermore, the honeycomb patterns can inhibit bacterial growth and change the direction of growth when the bacterial is confined into a well. These influences may result from the physical confinement effect on bacteria. By comparing Sample_UP vs. Sample_DOWN, the adherent bacterial is much less on Sample_DOWN, but the trends of bacterial adhesion are the same and irrespective of the gravity of bacteria. In comparison with bacterial responses to pillar patterns, we found that topographic patterns with dimensions approaching to bacterial size can provide stronger physical confinement effect than others. However, the viability of the bacteria does not obviously influenced by the pillar and honeycomb topography within 24h. This study is expected to contribute to better understanding of topographic effects on bacterial behavior and healthcare-associated infections on biomaterials.

Subjects/Keywords: Bacteria; Adhesion; Biomedical materials; Surfaces; Honeycomb structures

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APA (6^th Edition):

Yang, M. (2013). Bacterial behavior on honeycomb patterned surfaces. (Thesis). Hong Kong University of Science and Technology. Retrieved from https://doi.org/10.14711/thesis-b1255095 ; http://repository.ust.hk/ir/bitstream/1783.1-62656/1/th_redirect.html

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):

Yang, Meng. “Bacterial behavior on honeycomb patterned surfaces.” 2013. Thesis, Hong Kong University of Science and Technology. Accessed September 22, 2019. https://doi.org/10.14711/thesis-b1255095 ; http://repository.ust.hk/ir/bitstream/1783.1-62656/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Yang, Meng. “Bacterial behavior on honeycomb patterned surfaces.” 2013. Web. 22 Sep 2019.

Vancouver:

Yang M. Bacterial behavior on honeycomb patterned surfaces. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2013. [cited 2019 Sep 22]. Available from: https://doi.org/10.14711/thesis-b1255095 ; http://repository.ust.hk/ir/bitstream/1783.1-62656/1/th_redirect.html.

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

Council of Science Editors:

Yang M. Bacterial behavior on honeycomb patterned surfaces. [Thesis]. Hong Kong University of Science and Technology; 2013. Available from: https://doi.org/10.14711/thesis-b1255095 ; http://repository.ust.hk/ir/bitstream/1783.1-62656/1/th_redirect.html

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

Louisiana State University

9. Konka, Hari Prasad. Characterization of composite piezoelectric materials for smart joint applications.

Degree: MSME, Mechanical Engineering, 2009, Louisiana State University

URL: etd-05192010-064633 ; https://digitalcommons.lsu.edu/gradschool_theses/3661

► Piezoelectric materials have the ability to provide desired transformation from mechanical to electrical energy and vice versa. When a mechanical force is applied to the… (more)

▼ Piezoelectric materials have the ability to provide desired transformation from mechanical to electrical energy and vice versa. When a mechanical force is applied to the piezoelectric material an electrical voltage is generated and when an electrical voltage is applied to the piezoelectric material it gets strained or deformed. Owing to these characteristics piezoelectric materials can be used as a sensor, an actuator, as well as a power generation unit. The high brittleness property of the original piezoelectric material is one of the major constraints in using them in the engineering applications. In order to overcome this disadvantage the composite piezoelectric materials were developed. The piezoelectric fiber composite product is flexible and can sustain the extensive deformation without being damaged, and is compatible with the composite structures’ processing procedure; which makes it, an ideal material to be used as an embedded sensor & a force actuator within the composite structures. The smart joint can be designed to have the piezoelectric materials embedded in them, the piezoelectric materials can detect the various loads that act on the composite joint and could provide the required counter-balancing force to the excitation forces acting on the joint; and thereby could reduce or even eliminate the effects of stress concentrations at the composite joint. A high stress concentration is one of the principal causes of structural failures. In this work our main objectives are to study the sensing and force generation capabilities of various commercially available composite piezoelectric configurations through series of experimentations and to compare their performances in order to use them in the smart joint applications. Firstly, the sensing capabilities of these products were investigated at various input frequencies and amplitudes of the dynamic loads. Secondly, the tensile and bending force generation capabilities of these products were inspected with respect to various input excitation voltages. The results of these experiments depict that the voltage signals generated from these products are proportional to amplitudes of mechanical movement, with good response at high frequency, even at micrometer deformation domain; but the force generation is relatively low under the current input conditions and configuration under study.

Subjects/Keywords: composite; dynamic load; smart structures; piezoelectric materials

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APA (6^th Edition):

Konka, H. P. (2009). Characterization of composite piezoelectric materials for smart joint applications. (Masters Thesis). Louisiana State University. Retrieved from etd-05192010-064633 ; https://digitalcommons.lsu.edu/gradschool_theses/3661

Chicago Manual of Style (16^th Edition):

Konka, Hari Prasad. “Characterization of composite piezoelectric materials for smart joint applications.” 2009. Masters Thesis, Louisiana State University. Accessed September 22, 2019. etd-05192010-064633 ; https://digitalcommons.lsu.edu/gradschool_theses/3661.

MLA Handbook (7^th Edition):

Konka, Hari Prasad. “Characterization of composite piezoelectric materials for smart joint applications.” 2009. Web. 22 Sep 2019.

Vancouver:

Konka HP. Characterization of composite piezoelectric materials for smart joint applications. [Internet] [Masters thesis]. Louisiana State University; 2009. [cited 2019 Sep 22]. Available from: etd-05192010-064633 ; https://digitalcommons.lsu.edu/gradschool_theses/3661.

Council of Science Editors:

Konka HP. Characterization of composite piezoelectric materials for smart joint applications. [Masters Thesis]. Louisiana State University; 2009. Available from: etd-05192010-064633 ; https://digitalcommons.lsu.edu/gradschool_theses/3661

Delft University of Technology

10. Wink, H.P. Retrofitting of Existing Infrastructure Structures with Advanced Cementitious Materials (ACM's):.

Degree: 2015, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:b9218b73-ccd5-4cbc-b9d7-326440817b3b

► Existing structures are built according to the valid codes at that time and reaching their design life time. The traffic loads and traffic intensity has… (more)

▼ Existing structures are built according to the valid codes at that time and reaching their design life time. The traffic loads and traffic intensity has also increased. In addition, the existing reinforced concrete structures are exposed to degradation mechanisms, like chlorides and carbonation during their lifetime. Existing concrete road infrastructure can have the need to restore the structural performance or the durability. Advanced Ce-mentitious Materials (ACM’s) has the potential for retrofitting due to the increased strength properties and durability. High Performance Concrete (HPC) and especially Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) have increased strength properties and a dense matrix, which prevents the ingress of detrimental substances. Strain Hardening Cementitious Composites (SHCC) has a high tensile strain capacity, whereby the crack widths are limited. The strengthening effect of SHCC retrofitting is negligible. The biggest potential for retrofitting of existing infrastructure with ACM’s is in retrofitting of durability problems. The structural shear strength problems are less severe than originally thought and traditional structural retrofit solutions like FRP lamellas and external prestressing seems to be more feasible and more economic solutions compared to an ACM layer retrofit system. On the other hand, the reinforcement corrosion of concrete structures is expected to increase. Moreover, HPC and UHPFRC both have a dense matrix to prevent the ingress of detrimental substances. SHCC exhibits a large tensile strain capacity and limited crack widths. A specific durability ACM retrofit solution is used in a numerical model (see Figure 1). The durability retrofitting is based on a cast in situ ACM layer on a vertical existing surface, where the time-dependent development of the ACM properties and the interface between the ACM layer and old concrete determine the structural behav-iour. The mechanical properties develop due to the on-going hydration. Shrinkage is the cause of the main stresses in the model and the stresses are partly relaxed by the tensile creep behaviour of the ACM layer. The basic failure modes are debonding of the ACM layer at the free ends and transverse cracking in the ACM layer. A vertical existing surface is used, because vertical surfaces of road infrastructure structures can exhibit dura-bility problems due to de-icing salts in splash water and also tidal zones of marine structures. A parameter study is performed to enhance the understanding of the structural behaviour due to the time-dependent behaviour of the new ACM layer. A thicker ACM layer causes more debonding and transverse crack-ing behaviour, because the total shrinkage displacement is higher which causes higher stresses. A larger shrink-age strain causes higher stresses and more cracking. The creep in the ACM layer causes a stress relaxation. Increased creep compliance results in less severe cracking. The influence of the thickness of the old concrete structure and the length of the ACM… Advisors/Committee Members: Hordijk, D.A., Reitsema, A.D., Savija, B., Grünewald, S., Houben, L..

Subjects/Keywords: retrofitting; existing structures; Advanced Cementitious Materials

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APA (6^th Edition):

Wink, H. P. (2015). Retrofitting of Existing Infrastructure Structures with Advanced Cementitious Materials (ACM's):. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b9218b73-ccd5-4cbc-b9d7-326440817b3b

Chicago Manual of Style (16^th Edition):

Wink, H P. “Retrofitting of Existing Infrastructure Structures with Advanced Cementitious Materials (ACM's):.” 2015. Masters Thesis, Delft University of Technology. Accessed September 22, 2019. http://resolver.tudelft.nl/uuid:b9218b73-ccd5-4cbc-b9d7-326440817b3b.

MLA Handbook (7^th Edition):

Wink, H P. “Retrofitting of Existing Infrastructure Structures with Advanced Cementitious Materials (ACM's):.” 2015. Web. 22 Sep 2019.

Vancouver:

Wink HP. Retrofitting of Existing Infrastructure Structures with Advanced Cementitious Materials (ACM's):. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2019 Sep 22]. Available from: http://resolver.tudelft.nl/uuid:b9218b73-ccd5-4cbc-b9d7-326440817b3b.

Council of Science Editors:

Wink HP. Retrofitting of Existing Infrastructure Structures with Advanced Cementitious Materials (ACM's):. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:b9218b73-ccd5-4cbc-b9d7-326440817b3b

Clemson University

11. Schultz, Jesse. Modeling and Finite Element Analysis Methods for the Dynamic Crushing of Honeycomb Cellular Meso-Structures.

Degree: MS, Mechanical Engineering, 2011, Clemson University

URL: https://tigerprints.clemson.edu/all_theses/1106

► The effective static mechanical properties, such as the moduli of elasticity and rigidity and Poisson's ratio, of honeycomb cellular meso-structures are capable of control due… (more)

Subjects/Keywords: Cellular Materials; FEA; Honeycomb; Impact; Meso-structures; Meta-Materials; Mechanical Engineering

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APA (6^th Edition):

Schultz, J. (2011). Modeling and Finite Element Analysis Methods for the Dynamic Crushing of Honeycomb Cellular Meso-Structures. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1106

Chicago Manual of Style (16^th Edition):

Schultz, Jesse. “Modeling and Finite Element Analysis Methods for the Dynamic Crushing of Honeycomb Cellular Meso-Structures.” 2011. Masters Thesis, Clemson University. Accessed September 22, 2019. https://tigerprints.clemson.edu/all_theses/1106.

MLA Handbook (7^th Edition):

Schultz, Jesse. “Modeling and Finite Element Analysis Methods for the Dynamic Crushing of Honeycomb Cellular Meso-Structures.” 2011. Web. 22 Sep 2019.

Vancouver:

Schultz J. Modeling and Finite Element Analysis Methods for the Dynamic Crushing of Honeycomb Cellular Meso-Structures. [Internet] [Masters thesis]. Clemson University; 2011. [cited 2019 Sep 22]. Available from: https://tigerprints.clemson.edu/all_theses/1106.

Council of Science Editors:

Schultz J. Modeling and Finite Element Analysis Methods for the Dynamic Crushing of Honeycomb Cellular Meso-Structures. [Masters Thesis]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_theses/1106

Rice University

12. Gong, Yongji. 2D Materials in Lego Style: Synthesis, Characterizations and Applications.

Degree: PhD, Natural Sciences, 2015, Rice University

URL: http://hdl.handle.net/1911/87824

► Recently, the emergence and development of 2D materials with various optical and electrical properties has opened up new routes for electronic and optoelectronic device fabrication… (more)

▼ Recently, the emergence and development of 2D materials with various optical and electrical properties has opened up new routes for electronic and optoelectronic device fabrication based on atomically thin layers. For example, graphene behaves as a semi-metal with extremely high mobility, hexagonal boron nitride (h-BN) is a good insulator and monolayer TMDs such as MoS2, MoSe2 and WSe2 are semiconductors with direct band gap. This diversity offers the opportunity to construct atomically thin electronics based entirely on 2D materials. One of the most promising applications is to get 2D integrated circuits to replace the traditional silicon based ones, which will be much thinner and faster. 2D materials can be considered to be analogous to Lego blocks. The Lego game is to use different Lego blocks to get a complicated Lego building. Similarly, we can use different 2D materials to get the corresponding integrated circuits or devices for energy related applications. Based on this purpose, we need different 2D blocks, which are the most fundamental parts in the 2D world, 2D materials with tunable properties, and different strategies to combine the 2D materials together. Chapter 1 focuses on synthesis, characterization and applications of pristine 2D materials, which are the fundamental blocks for the 2D world. In this part, we synthesized different 2D materials such as insulator (h-BN), metal (graphene) and semiconductors (MX2, M = metal and X = chalcogen) for different applications. There are two directions in this part: one is to explore new 2D materials and the other one is to improve the growth of 2D materials to push them closer to their real applications. Moreover, semiconductors with different band gap (from 1.1 eV to 2.8 eV) and different type (p type and n type) have been developed. Furthermore, we improved the growth of different 2D materials to get their millimeter-scale single crystals or even continuous film. In the coming Chapter 2, we focused on the 2D alloys. The purpose of alloying 2D materials is to engineer the phase and band gap by changing the composition in the alloys. By this, we can tune the optical and electrical properties in 2D materials very easily. The first project in this part is about h-BNC system, which can open a band gap in graphene system, resulting in both high mobilities and high ON-OFF ratio in their transistors. Then we developed the MoS2-xSex (x, 0-2) alloys, in which the band gap can be continuously tuned from 1.50 eV to 1.84 eV. At last, RexMo1-xS2 (x, 0-1) system is developed to study the phase transition with different x. In Chapter 3, heterostructures based on different 2D materials are developed by different strategies. For example, we can get h-BN/h-BNC/graphene lateral heterostructure by combing a conversion method and lithography. We also developed the heterostructures based on MoS2/WS2 and MoSe2/WSe2 by a one-step growth method and two-step growth method, respectively. In both of them, we can get the in-plane and vertical heterostructures. The interface of the in-plane… Advisors/Committee Members: Ajayan, Pulickel M. (advisor), Jun, Lou (committee member), Marti, Angel (committee member).

Subjects/Keywords: 2D materials; pristine 2D materials; alloying 2D materials; 2D heterostructures; 3D structures; energy

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APA (6^th Edition):

Gong, Y. (2015). 2D Materials in Lego Style: Synthesis, Characterizations and Applications. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/87824

Chicago Manual of Style (16^th Edition):

Gong, Yongji. “2D Materials in Lego Style: Synthesis, Characterizations and Applications.” 2015. Doctoral Dissertation, Rice University. Accessed September 22, 2019. http://hdl.handle.net/1911/87824.

MLA Handbook (7^th Edition):

Gong, Yongji. “2D Materials in Lego Style: Synthesis, Characterizations and Applications.” 2015. Web. 22 Sep 2019.

Vancouver:

Gong Y. 2D Materials in Lego Style: Synthesis, Characterizations and Applications. [Internet] [Doctoral dissertation]. Rice University; 2015. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/1911/87824.

Council of Science Editors:

Gong Y. 2D Materials in Lego Style: Synthesis, Characterizations and Applications. [Doctoral Dissertation]. Rice University; 2015. Available from: http://hdl.handle.net/1911/87824

Cal Poly

13. Carter, Jeffrey Scott. Effects of Low Velocity Impact on the Flexural Strength of Composite Sandwich Structures.

Degree: MS, Aerospace Engineering, 2014, Cal Poly

URL: https://digitalcommons.calpoly.edu/theses/1327 ; 10.15368/theses.2014.164

► The use of composite sandwich structures is rapidly increasing in the aerospace industry because of their increased strength-to-weight and stiffness-to-weight characteristics. The effects of… (more)

▼ The use of composite sandwich structures is rapidly increasing in the aerospace industry because of their increased strength-to-weight and stiffness-to-weight characteristics. The effects of low velocity impacts on these structures, however, are the main weakness that hinders further use of them in the industry because the damages from these loadings can often be catastrophic. Impact behavior of composite materials in general is a crucial consideration for a designer but can be difficult to describe theoretically. Because of this, experimental analysis is typically used to attempt to describe the behavior of composite sandwiches under impact loads. Experimental testing can still be unpredictable, however, because low velocity impacts can cause undetectable damage within the composites that weaken their structural integrity. This is an important issue with composite sandwich structures because interlaminar damage within the composite facesheets is typical with composites but the addition of a core material results in added failure modes. Because the core is typically a weaker material than the surrounding facesheet material, the core is easily damaged by the impact loads. The adhesion between the composite facesheets and the core material can also be a major region of concern for sandwich structures. Delamination of the facesheet from the core is a major issue when these structures are subjected to impact loads. This study investigated, through experimental and numerical analysis, how varying the core and facesheet material combination affected the flexural strength of a composite sandwich subjected to low velocity impact. Carbon, hemp, aramid, and glass fiber materials as facesheets combined with honeycomb and foam as core materials were considered. Three layers of the same composite material were laid on the top and bottom of the core material to form each sandwich structure. This resulted in eight different sandwich designs. The carbon fiber/honeycomb sandwiches were then combined with the aramid fiber facesheets, keeping the same three layer facesheet design, to form two hybrid sandwich designs. This was done to attempt to improve the impact resistance and post-impact strength characteristics of the carbon fiber sandwiches. The two and one layer aramid fiber laminates on these hybrid sandwiches were always laid up on the outside of the structure. The sandwiches were cured using a composite press set to the recommended curing cycle for the composite facesheet material. The hybrid sandwiches were cured twice for the two different facesheet materials. The cured specimens were then cut into 3 inch by 10 inch sandwiches and 2/3 of them were subjected to an impact from a 7.56 lbf crosshead which was dropped from a height of 38.15 inches above the bottom of the specimen using a Dynatup 8250 drop weight machine. The impacted specimen and the control specimen (1/3 of the specimens not subjected to an impact) were loaded in a four-point bend test per ASTM D7250 to determine the non-impacted and post-impact… Advisors/Committee Members: Dr. Faysal Kolkailah.

Subjects/Keywords: Aerospace Engineering; Composite Materials; Composite Sandwich Structures; Impact Testing; Four-Point Bend Testing; Structures and Materials

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APA (6^th Edition):

Carter, J. S. (2014). Effects of Low Velocity Impact on the Flexural Strength of Composite Sandwich Structures. (Masters Thesis). Cal Poly. Retrieved from https://digitalcommons.calpoly.edu/theses/1327 ; 10.15368/theses.2014.164

Chicago Manual of Style (16^th Edition):

Carter, Jeffrey Scott. “Effects of Low Velocity Impact on the Flexural Strength of Composite Sandwich Structures.” 2014. Masters Thesis, Cal Poly. Accessed September 22, 2019. https://digitalcommons.calpoly.edu/theses/1327 ; 10.15368/theses.2014.164.

MLA Handbook (7^th Edition):

Carter, Jeffrey Scott. “Effects of Low Velocity Impact on the Flexural Strength of Composite Sandwich Structures.” 2014. Web. 22 Sep 2019.

Vancouver:

Carter JS. Effects of Low Velocity Impact on the Flexural Strength of Composite Sandwich Structures. [Internet] [Masters thesis]. Cal Poly; 2014. [cited 2019 Sep 22]. Available from: https://digitalcommons.calpoly.edu/theses/1327 ; 10.15368/theses.2014.164.

Council of Science Editors:

Carter JS. Effects of Low Velocity Impact on the Flexural Strength of Composite Sandwich Structures. [Masters Thesis]. Cal Poly; 2014. Available from: https://digitalcommons.calpoly.edu/theses/1327 ; 10.15368/theses.2014.164

NSYSU

14. Chang, Hsiao-wen. Electric-Field Effects on Magnetic Properties of (Ga,Mn)Sb Channel in Field-Effect Structures.

Degree: PhD, Physics, 2015, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1124114-185048

► This thesis investigates the magnetotransport properties of ultrathin (Ga,Mn)Sb layers in a field-effect structure. We fabricate a metal-insulator-semiconductor field-effect structure with a thin (Ga,Mn)Sb channel… (more)

Subjects/Keywords: Magnetic materials; Field effect structures; Semiconducting IIIâV materials; Antimonides; Molecular beam epitaxy

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APA (6^th Edition):

Chang, H. (2015). Electric-Field Effects on Magnetic Properties of (Ga,Mn)Sb Channel in Field-Effect Structures. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1124114-185048

Chicago Manual of Style (16^th Edition):

Chang, Hsiao-wen. “Electric-Field Effects on Magnetic Properties of (Ga,Mn)Sb Channel in Field-Effect Structures.” 2015. Doctoral Dissertation, NSYSU. Accessed September 22, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1124114-185048.

MLA Handbook (7^th Edition):

Chang, Hsiao-wen. “Electric-Field Effects on Magnetic Properties of (Ga,Mn)Sb Channel in Field-Effect Structures.” 2015. Web. 22 Sep 2019.

Vancouver:

Chang H. Electric-Field Effects on Magnetic Properties of (Ga,Mn)Sb Channel in Field-Effect Structures. [Internet] [Doctoral dissertation]. NSYSU; 2015. [cited 2019 Sep 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1124114-185048.

Council of Science Editors:

Chang H. Electric-Field Effects on Magnetic Properties of (Ga,Mn)Sb Channel in Field-Effect Structures. [Doctoral Dissertation]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1124114-185048

Miami University

15. Crase, Jason L. Synthesis and Characterization of Ortho-Phenylene Oligomers.

Degree: MS, Chemistry, 2010, Miami University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=miami1282931679

► ortho-Phenylene oligomers are a class of organic molecules that are both chemically and synthetically interesting. Similar molecules have found uses in organic light emitting diodes… (more)

Subjects/Keywords: Chemistry; Materials Science; Organic Chemistry; Polymers; Ortho-phenylene oligomers; organic electronics; helical structures; materials chemistry

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APA (6^th Edition):

Crase, J. L. (2010). Synthesis and Characterization of Ortho-Phenylene Oligomers. (Masters Thesis). Miami University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=miami1282931679

Chicago Manual of Style (16^th Edition):

Crase, Jason L. “Synthesis and Characterization of Ortho-Phenylene Oligomers.” 2010. Masters Thesis, Miami University. Accessed September 22, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1282931679.

MLA Handbook (7^th Edition):

Crase, Jason L. “Synthesis and Characterization of Ortho-Phenylene Oligomers.” 2010. Web. 22 Sep 2019.

Vancouver:

Crase JL. Synthesis and Characterization of Ortho-Phenylene Oligomers. [Internet] [Masters thesis]. Miami University; 2010. [cited 2019 Sep 22]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=miami1282931679.

Council of Science Editors:

Crase JL. Synthesis and Characterization of Ortho-Phenylene Oligomers. [Masters Thesis]. Miami University; 2010. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=miami1282931679

University of California – Merced

16. Diaz Moreno, Miguel Fernando. An Integrated Study of the Porous Structure and Mechanical Properties of Diatoms.

Degree: Biological Engineering and Small-scale Technologies, 2015, University of California – Merced

URL: http://www.escholarship.org/uc/item/3g83t614

► Diatoms are microscopic algae featuring porous cell wall structures (frustules). Due to the wide variety of diatom shapes and intricate architectures, diatom frustules are viable… (more)

▼ Diatoms are microscopic algae featuring porous cell wall structures (frustules). Due to the wide variety of diatom shapes and intricate architectures, diatom frustules are viable prototypes to guide the design and fabrication of nanodevices for applications ranging from sensors to nanotemplates. The porous structure and mechanical behavior of biosilica diatom frustules were evaluated through ambient nanoindentation, AFM-based nanoindentation and finite element method (FEM) analysis. Two diatom species, Coscinodiscus sp. (centric) and Synedra sp. (pennate), were investigated through ambient nanoindentation and FEM simulation. High-resolution microscopy unveiled the diatom species structures. These diatom frustule dimensions varied largely depending on diatom species (diameters from 70-250 μm and lengths from 100-300 μm) with pore diameters ranging from 0.1-3.0 μm. Young’s modulus E and hardness H of the diatom frustules were obtained via ambient nanoindentation. These values varied also depending on diatom species: E from 1.1-10.6 GPa, H from 0.10-1.03 GPa for the Coscinodiscus sp.; and E from 13.7-18.6 GPa, H from 0.85-1.41 GPa for the Synedra sp. Predictive FEM simulations were performed on well-validated 3D frustule models, to correlate the mechanical response with specific morphology variables such as pore sizes. A correlation between mechanical properties and porosity was established for selected frustules. Furthermore, AFM investigation and FEM simulation involving 3D frustule models with hierarchical geometries were achieved to investigate the structure-property relationship upon compressive loads. AFM imaging and AFM-based nanoindentation of the centric and pennate frustules provided surface morphology and associated load-displacement curves, which were used to further characterize the diatoms. The calculated average E was 21.5 GPa and 26 GPa for the Coscinodiscus sp. and Synedra sp. respectively, which are higher than the values obtained from ambient nanoindentation. FEM compression simulations were also performed on centric models only to study the role of the hierarchical structures on their mechanical response. Displacement and stress distributions of a three-layered hierarchical frustule model under varied loads were systematically investigated. Results were compared with a stacking of three porous layers for further discussion. Suggestions for future experiments and modeling efforts are provided to enhance the ability to map strategies for the fabrication of 3D nanostructures and nanodevices.

Subjects/Keywords: Materials Science; Nanoscience; Engineering; Bioinspired materials; Diatoms; FEM simulations; Hierarchical structures; Nanomechanical experiment

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APA (6^th Edition):

Diaz Moreno, M. F. (2015). An Integrated Study of the Porous Structure and Mechanical Properties of Diatoms. (Thesis). University of California – Merced. Retrieved from http://www.escholarship.org/uc/item/3g83t614

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):

Diaz Moreno, Miguel Fernando. “An Integrated Study of the Porous Structure and Mechanical Properties of Diatoms.” 2015. Thesis, University of California – Merced. Accessed September 22, 2019. http://www.escholarship.org/uc/item/3g83t614.

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

MLA Handbook (7^th Edition):

Diaz Moreno, Miguel Fernando. “An Integrated Study of the Porous Structure and Mechanical Properties of Diatoms.” 2015. Web. 22 Sep 2019.

Vancouver:

Diaz Moreno MF. An Integrated Study of the Porous Structure and Mechanical Properties of Diatoms. [Internet] [Thesis]. University of California – Merced; 2015. [cited 2019 Sep 22]. Available from: http://www.escholarship.org/uc/item/3g83t614.

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

Council of Science Editors:

Diaz Moreno MF. An Integrated Study of the Porous Structure and Mechanical Properties of Diatoms. [Thesis]. University of California – Merced; 2015. Available from: http://www.escholarship.org/uc/item/3g83t614

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

Utah State University

17. Christensen, Justin. Electron Yield Measurements of High-Yield, Low-Conductivity Dielectric Materials.

Degree: MS, Physics, 2017, Utah State University

URL: https://digitalcommons.usu.edu/etd/6694

► Materials exposed to the space plasma environment acquire electric charge, which can have harmful effects if it leads to arcing or electrostatic breakdown of… (more)

▼ Materials exposed to the space plasma environment acquire electric charge, which can have harmful effects if it leads to arcing or electrostatic breakdown of important spacecraft components. In fact, spacecraft charging is the leading environmentally induced cause of spacecraft anomalies. This study focuses on measuring electron yield, a property of materials that describes how many electrons are ejected from a material under energetic electron bombardment, which can vary depending on the energy of incident electrons. Intrinsic electron yield is defined as the average number of electrons emitted per incident electron from an electrically neutral material. The specific aim of this work is to improve yield measurements for insulator materials, which can be difficult to test using conventional methods due to charge accumulation in insulators.Most studies of electron yield use a steady current electron beam in a vacuum chamber to irradiate materials to be tested. By comparing the amount of current deposited in the material to the total incident current, the emitted current can be calculated. This works well for conductors; however, insulators charge up quickly, which either repel incident electrons or reattract emitted electrons producing erroneous yield measurements. This study improves on methods that use a pulsed electron beam to measure yield with small amounts of charge per pulse, as well as neutralization methods to dissipate stored charge between pulse measurements.The improvements to instrumentation and data analysis techniques are quantified to demonstrate their validity. These improvements will allow for continued studies on extreme insulator materials. Future studies will provide new understanding of interactions between electron radiation and materials, which will allow for better modeling of spacecraft charging and the development of materials that meet desired electron emission specifications. Advisors/Committee Members: JR Dennison, D Mark Riffe, Farrell Edwards, ;.

Subjects/Keywords: Electron Yield; Charge Neutralization; Space Environment; Insulating Materials; Aerospace Engineering; Structures and Materials

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APA (6^th Edition):

Christensen, J. (2017). Electron Yield Measurements of High-Yield, Low-Conductivity Dielectric Materials. (Masters Thesis). Utah State University. Retrieved from https://digitalcommons.usu.edu/etd/6694

Chicago Manual of Style (16^th Edition):

Christensen, Justin. “Electron Yield Measurements of High-Yield, Low-Conductivity Dielectric Materials.” 2017. Masters Thesis, Utah State University. Accessed September 22, 2019. https://digitalcommons.usu.edu/etd/6694.

MLA Handbook (7^th Edition):

Christensen, Justin. “Electron Yield Measurements of High-Yield, Low-Conductivity Dielectric Materials.” 2017. Web. 22 Sep 2019.

Vancouver:

Christensen J. Electron Yield Measurements of High-Yield, Low-Conductivity Dielectric Materials. [Internet] [Masters thesis]. Utah State University; 2017. [cited 2019 Sep 22]. Available from: https://digitalcommons.usu.edu/etd/6694.

Council of Science Editors:

Christensen J. Electron Yield Measurements of High-Yield, Low-Conductivity Dielectric Materials. [Masters Thesis]. Utah State University; 2017. Available from: https://digitalcommons.usu.edu/etd/6694

Embry-Riddle Aeronautical University

18. Rovik, Christopher Lee. Classification of In-Flight Fatigue Cracks in Aircraft Structures using Acoustic Emission and Neural Networks.

Degree: MSin Aerospace Engineering, Graduate Studies, 1998, Embry-Riddle Aeronautical University

URL: http://commons.erau.edu/db-theses/231

► The research encompassed within this paper deals with the analysis and classification of fatigue cracks in aircraft structures. The particular structure that was examined… (more)

▼ The research encompassed within this paper deals with the analysis and classification of fatigue cracks in aircraft structures. The particular structure that was examined was the vertical tail section of a Cessna T-303 Crusader aircraft. The analysis was performed using the nondestructive evaluation technique known as acoustic emission (AE), as well as the artificial intelligence of neural networks. Data were taken in a controlled laboratory environment as well as in a flying testbed aboard the aircraft. The first part of the research involved the analysis of a typical aircraft structure in a controlled laboratory environment. This support structure was fabricated from 7075-T6 aluminum, which is common in aircraft structures. Two different methods were used to fatigue the support, an MTS tensile test machine and a shaker table. Extensive AE data were taken throughout the laboratory tests in order to provide a known reference for the identification of fatigue cracks. The acoustic emission data derived from the laboratory tests were thoroughly examined and sorted into three distinct mechanisms: fatigue cracking, plastic deformation, and mechanical noise. The AE parameters associated with these mechanisms were in turn used to train a neural network. The neural network used was the Kohonen self-organizing map, as it is an excellent choice for the purpose of classification. Once the neural network was trained, it was possible to proceed to the second stage of the research. A support structure, identical to the one used in the laboratory tests, was installed in the vertical tail of the T-303 aircraft. Acoustic emission data were gathered during all aspects of aircraft maneuvers, from the initial taxiing and takeoff to the final approach and landing, including rolls and Dutch rolls. The AE parameters recorded from the in-flight tests were processed using the neural network trained in the first part of the research. Thus, the data were classified as being indicative of fatigue cracking, plastic deformation, or rubbing. These mechanisms were then analyzed with respect to the particular maneuver performed to further understand the stresses associated with different maneuvers. As a result of the ability to classify fatigue cracks, it is possible to develop a monitoring system for aircraft to determine the existence of fatigue cracks before they grow to the point where they become dangerous. Advisors/Committee Members: Dr. Eric v. K. Hill, Dr. Frank J. Radosta, Dr. James G. Ladesic.

Subjects/Keywords: Aerospace Engineering; Structures and Materials

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APA (6^th Edition):

Rovik, C. L. (1998). Classification of In-Flight Fatigue Cracks in Aircraft Structures using Acoustic Emission and Neural Networks. (Masters Thesis). Embry-Riddle Aeronautical University. Retrieved from http://commons.erau.edu/db-theses/231

Chicago Manual of Style (16^th Edition):

Rovik, Christopher Lee. “Classification of In-Flight Fatigue Cracks in Aircraft Structures using Acoustic Emission and Neural Networks.” 1998. Masters Thesis, Embry-Riddle Aeronautical University. Accessed September 22, 2019. http://commons.erau.edu/db-theses/231.

MLA Handbook (7^th Edition):

Rovik, Christopher Lee. “Classification of In-Flight Fatigue Cracks in Aircraft Structures using Acoustic Emission and Neural Networks.” 1998. Web. 22 Sep 2019.

Vancouver:

Rovik CL. Classification of In-Flight Fatigue Cracks in Aircraft Structures using Acoustic Emission and Neural Networks. [Internet] [Masters thesis]. Embry-Riddle Aeronautical University; 1998. [cited 2019 Sep 22]. Available from: http://commons.erau.edu/db-theses/231.

Council of Science Editors:

Rovik CL. Classification of In-Flight Fatigue Cracks in Aircraft Structures using Acoustic Emission and Neural Networks. [Masters Thesis]. Embry-Riddle Aeronautical University; 1998. Available from: http://commons.erau.edu/db-theses/231

Embry-Riddle Aeronautical University

19. Nguyen, Tuan-Khoi Dang. Damage Assessment and Strength Predictions in S-Glass/Epoxy Laminates Subjected to Low Energy Impact.

Degree: Master of Aerospace Engineering, Graduate Studies, 2005, Embry-Riddle Aeronautical University

URL: http://commons.erau.edu/db-theses/248

► Composite materials have become one of the leading materials for manufacturing in the aerospace industry today. Compared to "conventional" aerospace metals, composites generally have… (more)

▼ Composite materials have become one of the leading materials for manufacturing in the aerospace industry today. Compared to "conventional" aerospace metals, composites generally have higher strength-to-weight and stiffness-to-weight ratios, good fatigue and corrosion resistance and reduced parts count. However, like any other material, they also have disadvantages. They are inherently brittle and are thus prone to impact damage. Low energy/velocity impact damage, in particular, can be dangerous because the damage oftentimes goes undetected and can subsequently grow under load. Also known as barely visible impact damage (BVID), this area of concentration focuses on the small-scale damage that may be very difficult to detect yet can be lethal. The primary emphasis of this research is to predict the residual compressive strength of a 16-ply laminate [(0°/±45°/90°)2]s after experiencing low energy/velocity impact using combined technical approaches of ultrasonic C-scan and neural networks. To accomplish this, each test specimen was ultrasonically C-scanned after impact testing. A MATLAB computer program was then used to convert the image files into numeric data, which they were presented to a backpropagation neural network in order to predict the residual compressive strength. Microsoft Excel was used to take the average of the diagonal values of the normalized image data. Here the average prediction error turned out to be 3.9 percent, while the worst-case prediction error was 14.6 percent. This research also focused on identifying, sorting, and classifying how the composite laminates failed under compression after experiencing low energy/low velocity impact. Acoustic emission (AE) parameter data were collected during compression testing, and then inputted into an artificial neural network (ANN) for classification. Specifically a Kohonen Self Organizing Map (SOM) was used to sort and classify the failure mechanisms that occurred within the weakened composites. The associated BVID failure modes, otherwise known as failure mechanisms, were believed to consist primarily of transverse and longitudinal matrix cracks, delaminations, and occasionally fiber breaks. Even though delaminations are the most critical failure modes in BVID under compression, the other failure mechanisms also contribute significantly. Furthermore, it appeared that it was also possible to sort out and determine the transition regions between BVID and visible impact damage (VID) with AE data. Thus, it is important to know how the material fails so that necessary precautions can be taken to minimize these critical failure modes. Advisors/Committee Members: Dr. Yi Zhao, Dr. Eric v. K. Hill, Dr. David J. Sypeck.

Subjects/Keywords: Aerospace Engineering; Structures and Materials

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APA (6^th Edition):

Nguyen, T. D. (2005). Damage Assessment and Strength Predictions in S-Glass/Epoxy Laminates Subjected to Low Energy Impact. (Masters Thesis). Embry-Riddle Aeronautical University. Retrieved from http://commons.erau.edu/db-theses/248

Chicago Manual of Style (16^th Edition):

Nguyen, Tuan-Khoi Dang. “Damage Assessment and Strength Predictions in S-Glass/Epoxy Laminates Subjected to Low Energy Impact.” 2005. Masters Thesis, Embry-Riddle Aeronautical University. Accessed September 22, 2019. http://commons.erau.edu/db-theses/248.

MLA Handbook (7^th Edition):

Nguyen, Tuan-Khoi Dang. “Damage Assessment and Strength Predictions in S-Glass/Epoxy Laminates Subjected to Low Energy Impact.” 2005. Web. 22 Sep 2019.

Vancouver:

Nguyen TD. Damage Assessment and Strength Predictions in S-Glass/Epoxy Laminates Subjected to Low Energy Impact. [Internet] [Masters thesis]. Embry-Riddle Aeronautical University; 2005. [cited 2019 Sep 22]. Available from: http://commons.erau.edu/db-theses/248.

Council of Science Editors:

Nguyen TD. Damage Assessment and Strength Predictions in S-Glass/Epoxy Laminates Subjected to Low Energy Impact. [Masters Thesis]. Embry-Riddle Aeronautical University; 2005. Available from: http://commons.erau.edu/db-theses/248

Embry-Riddle Aeronautical University

20. Thornton, Weldon Paul. Classification of Acoustic Emission Signals from an Aluminum Pressure Vessel Using a Self-Organizing Map.

Degree: MSin Aerospace Engineering, Aerospace Engineering, 1995, Embry-Riddle Aeronautical University

URL: http://commons.erau.edu/db-theses/198

► Acoustic emission nondestructive testing has been used for real-time monitoring of complex structures. All of the structures were made of materials at least 0.070… (more)

Subjects/Keywords: Aerospace Engineering; Structures and Materials

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APA (6^th Edition):

Thornton, W. P. (1995). Classification of Acoustic Emission Signals from an Aluminum Pressure Vessel Using a Self-Organizing Map. (Masters Thesis). Embry-Riddle Aeronautical University. Retrieved from http://commons.erau.edu/db-theses/198

Chicago Manual of Style (16^th Edition):

Thornton, Weldon Paul. “Classification of Acoustic Emission Signals from an Aluminum Pressure Vessel Using a Self-Organizing Map.” 1995. Masters Thesis, Embry-Riddle Aeronautical University. Accessed September 22, 2019. http://commons.erau.edu/db-theses/198.

MLA Handbook (7^th Edition):

Thornton, Weldon Paul. “Classification of Acoustic Emission Signals from an Aluminum Pressure Vessel Using a Self-Organizing Map.” 1995. Web. 22 Sep 2019.

Vancouver:

Thornton WP. Classification of Acoustic Emission Signals from an Aluminum Pressure Vessel Using a Self-Organizing Map. [Internet] [Masters thesis]. Embry-Riddle Aeronautical University; 1995. [cited 2019 Sep 22]. Available from: http://commons.erau.edu/db-theses/198.

Council of Science Editors:

Thornton WP. Classification of Acoustic Emission Signals from an Aluminum Pressure Vessel Using a Self-Organizing Map. [Masters Thesis]. Embry-Riddle Aeronautical University; 1995. Available from: http://commons.erau.edu/db-theses/198

Embry-Riddle Aeronautical University

21. Savella, Philip A. Maneuvering Control of a Spacecraft with Propellant Sloshing.

Degree: MSin Space Science, Physical Sciences, 2005, Embry-Riddle Aeronautical University

URL: http://commons.erau.edu/db-theses/178

► Propellant slosh has been a problem studied in spacecraft designs since the early days of large, liquid-fuel rockets. The conventional design solution involves physical… (more)

Subjects/Keywords: Space Vehicles; Structures and Materials

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APA (6^th Edition):

Savella, P. A. (2005). Maneuvering Control of a Spacecraft with Propellant Sloshing. (Masters Thesis). Embry-Riddle Aeronautical University. Retrieved from http://commons.erau.edu/db-theses/178

Chicago Manual of Style (16^th Edition):

Savella, Philip A. “Maneuvering Control of a Spacecraft with Propellant Sloshing.” 2005. Masters Thesis, Embry-Riddle Aeronautical University. Accessed September 22, 2019. http://commons.erau.edu/db-theses/178.

MLA Handbook (7^th Edition):

Savella, Philip A. “Maneuvering Control of a Spacecraft with Propellant Sloshing.” 2005. Web. 22 Sep 2019.

Vancouver:

Savella PA. Maneuvering Control of a Spacecraft with Propellant Sloshing. [Internet] [Masters thesis]. Embry-Riddle Aeronautical University; 2005. [cited 2019 Sep 22]. Available from: http://commons.erau.edu/db-theses/178.

Council of Science Editors:

Savella PA. Maneuvering Control of a Spacecraft with Propellant Sloshing. [Masters Thesis]. Embry-Riddle Aeronautical University; 2005. Available from: http://commons.erau.edu/db-theses/178

University of Colorado

22. Metts, Jonathan Glen. Assessing feasibility of electrochromic space suit radiators for reducing extravehicular activity water consumption.

Degree: PhD, Aerospace Engineering Sciences, 2010, University of Colorado

URL: http://scholar.colorado.edu/asen_gradetds/10

► Water consumption for space suit thermal control is a limiting factor on long-term space exploration missions. A concept is proposed for an integrated, flexible… (more)

Subjects/Keywords: electrochromic; extravehicular; lunar; radiator; Aerospace Engineering; Structures and Materials

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APA (6^th Edition):

Metts, J. G. (2010). Assessing feasibility of electrochromic space suit radiators for reducing extravehicular activity water consumption. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/asen_gradetds/10

Chicago Manual of Style (16^th Edition):

Metts, Jonathan Glen. “Assessing feasibility of electrochromic space suit radiators for reducing extravehicular activity water consumption.” 2010. Doctoral Dissertation, University of Colorado. Accessed September 22, 2019. http://scholar.colorado.edu/asen_gradetds/10.

MLA Handbook (7^th Edition):

Metts, Jonathan Glen. “Assessing feasibility of electrochromic space suit radiators for reducing extravehicular activity water consumption.” 2010. Web. 22 Sep 2019.

Vancouver:

Metts JG. Assessing feasibility of electrochromic space suit radiators for reducing extravehicular activity water consumption. [Internet] [Doctoral dissertation]. University of Colorado; 2010. [cited 2019 Sep 22]. Available from: http://scholar.colorado.edu/asen_gradetds/10.

Council of Science Editors:

Metts JG. Assessing feasibility of electrochromic space suit radiators for reducing extravehicular activity water consumption. [Doctoral Dissertation]. University of Colorado; 2010. Available from: http://scholar.colorado.edu/asen_gradetds/10

University of Colorado

23. Panosian, Stephen. Stiffness Analysis of the Tethered Coulomb Structure Concept and Application.

Degree: MS, Aerospace Engineering Sciences, 2011, University of Colorado

URL: http://scholar.colorado.edu/asen_gradetds/16

► This thesis investigates the Tethered Coulomb Structure (TCS) concept and its operating regime for creating large space structures and for providing satellite situational awareness.… (more)

Subjects/Keywords: Coulomb; Electrostatics; Formation; Spacecraft; Tether; Aerospace Engineering; Structures and Materials

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APA (6^th Edition):

Panosian, S. (2011). Stiffness Analysis of the Tethered Coulomb Structure Concept and Application. (Masters Thesis). University of Colorado. Retrieved from http://scholar.colorado.edu/asen_gradetds/16

Chicago Manual of Style (16^th Edition):

Panosian, Stephen. “Stiffness Analysis of the Tethered Coulomb Structure Concept and Application.” 2011. Masters Thesis, University of Colorado. Accessed September 22, 2019. http://scholar.colorado.edu/asen_gradetds/16.

MLA Handbook (7^th Edition):

Panosian, Stephen. “Stiffness Analysis of the Tethered Coulomb Structure Concept and Application.” 2011. Web. 22 Sep 2019.

Vancouver:

Panosian S. Stiffness Analysis of the Tethered Coulomb Structure Concept and Application. [Internet] [Masters thesis]. University of Colorado; 2011. [cited 2019 Sep 22]. Available from: http://scholar.colorado.edu/asen_gradetds/16.

Council of Science Editors:

Panosian S. Stiffness Analysis of the Tethered Coulomb Structure Concept and Application. [Masters Thesis]. University of Colorado; 2011. Available from: http://scholar.colorado.edu/asen_gradetds/16

Wright State University

24. Vijwani, Hema. HIGHLY ACTIVE POROUS CATALYSTS FABRICATED BY ATTACHMENT OF PALLADIUM NANOPARTICLES ON HIERARCHICAL CARBON STRUCTURES.

Degree: MSEgr, Materials Science and Engineering, 2011, Wright State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=wright1310438347

► The effectiveness of metal-based catalysts can be significantly enhanced by increasing the available surface area relative to the volume through the creation of hierarchical nanostructures.… (more)

▼ The effectiveness of metal-based catalysts can be significantly enhanced by increasing the available surface area relative to the volume through the creation of hierarchical nanostructures. The catalyst demonstrated here is palladium, which is a widely recognized heterogeneous catalyst suitable for a variety of industrial applications such as water purification, hydrogen storage, and electrochemical devices. In this study, a novel multi-scale supporting material developed in this group, has been used as support. It consists of micro-porous graphitic carbon with strongly attached carbon nanotubes. This can increase the surface area by orders of magnitude without increasing the size or weight while still maintaining structural integrity. This allows miniaturization of palladium catalysts structures that are lighter, smaller and more compact than conventional ones. Fabrication issues of these structures have been successfully addressed. Detailed micro-structural as well as spectroscopic analysis of the nanoparticles have been performed. Variations of palladium nanoparticles distribution with processing conditions, and the possible ways of controlling this distribution will be presented. Surface spectroscopic analysis indicates that these are zero-valent metallic palladium and do not degrade with time. The catalytic activity of palladium nanoparticles has been tested via bench-scale experiments for reductive dechlorination of carbon tetrachloride. It is seen that palladium functionalized carbon nanotubes is highly effective in the degradation of carbon tetrachloride and similar organic pollutants found commonly in drinking water sources. It was also demonstrated that palladium functionalized carbon nanotubes can be used repeatedly as the valence state of palladium does not change, and thus can be cost-effective. Future scope of these results and their connection to future device applications will be discussed. Advisors/Committee Members: Mukhopadhyay, Sharmila (Advisor).

Subjects/Keywords: Materials Science; Carbon Nanotubes; Palladium; Nanoparticle; Heirarchical structures; Catalysis; Dechlorination; XPS

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APA (6^th Edition):

Vijwani, H. (2011). HIGHLY ACTIVE POROUS CATALYSTS FABRICATED BY ATTACHMENT OF PALLADIUM NANOPARTICLES ON HIERARCHICAL CARBON STRUCTURES. (Masters Thesis). Wright State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=wright1310438347

Chicago Manual of Style (16^th Edition):

Vijwani, Hema. “HIGHLY ACTIVE POROUS CATALYSTS FABRICATED BY ATTACHMENT OF PALLADIUM NANOPARTICLES ON HIERARCHICAL CARBON STRUCTURES.” 2011. Masters Thesis, Wright State University. Accessed September 22, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1310438347.

MLA Handbook (7^th Edition):

Vijwani, Hema. “HIGHLY ACTIVE POROUS CATALYSTS FABRICATED BY ATTACHMENT OF PALLADIUM NANOPARTICLES ON HIERARCHICAL CARBON STRUCTURES.” 2011. Web. 22 Sep 2019.

Vancouver:

Vijwani H. HIGHLY ACTIVE POROUS CATALYSTS FABRICATED BY ATTACHMENT OF PALLADIUM NANOPARTICLES ON HIERARCHICAL CARBON STRUCTURES. [Internet] [Masters thesis]. Wright State University; 2011. [cited 2019 Sep 22]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1310438347.

Council of Science Editors:

Vijwani H. HIGHLY ACTIVE POROUS CATALYSTS FABRICATED BY ATTACHMENT OF PALLADIUM NANOPARTICLES ON HIERARCHICAL CARBON STRUCTURES. [Masters Thesis]. Wright State University; 2011. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1310438347

University of Akron

25. Bhargava, Sphurti. Submicron Structures, Electrospinning and Filters.

Degree: PhD, Polymer Science, 2007, University of Akron

URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1175607783

► Electrospun fibers have been used in high efficiency filters for over two decades. The electrospun fibers are responsible for better performance of the filters. In… (more)

▼ Electrospun fibers have been used in high efficiency filters for over two decades. The electrospun fibers are responsible for better performance of the filters. In this work, experiments were done in which electrospun nanofibers were exposed to a stream of oil fog. The growth rate of drops, by coalescence of oil droplets on a single fiber, was followed using optical microscopy. Different mechanisms by which the aerosol droplets can be captured include: interception, Brownian motion of droplets, inertial impaction and vapor deposition by diffusion. A quantitative model for predicting the growth rate by coalescence was developed and tested. The drop growth mechanism on a nanofiber can be attributed to both interception and Brownian diffusion mechanism in the creeping flow conditions. The relative contribution by the individual mechanisms was estimated. Merging of growing drops on the fiber was modeled and experimentally observed. The experimental merging time for drops is close to that predicted. We have discovered a novel technique of forming polymer nanostructures on various substrates, which involves vaporizing cyanoacrylate monomer. Cyanoacrylate monomer vapor was collected on a solid surface and polymerized to form nanofibers. Tiny spots of initiator on the surface of a substrate and small monomer droplets in the monomer vapor appear to be required for the growth of the polycyanoacrylate nanofibers. Morphology and size of the structures can be controlled by varying temperature, amount of monomer, amount of initiator and setup parameters. The polycyanoacrylate nanofibers create a network and increase the specific surface area significantly. Such structures can help in controlling the porosity and improving the structural stability of a filter. We have investigated the manufacturing process of yarns from electrospun nanofibers. The process involves electrospinning between two surfaces both grounded and placed at a certain distance apart. One of the collector surfaces is rotated at a particular speed to give twist to the fibers collected, thus obtaining yarn. Pulling the other collector away from the rotating collector, leads to continuous yarn manufacture. This method is useful for manufacture of composite and hollow yarn structures. Advisors/Committee Members: Reneker, Darrell (Advisor).

Subjects/Keywords: Engineering, Materials Science; Electrospinning; cyanoacrylate; structures; nanofibers; yarn; filters; coalescence

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APA (6^th Edition):

Bhargava, S. (2007). Submicron Structures, Electrospinning and Filters. (Doctoral Dissertation). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1175607783

Chicago Manual of Style (16^th Edition):

Bhargava, Sphurti. “Submicron Structures, Electrospinning and Filters.” 2007. Doctoral Dissertation, University of Akron. Accessed September 22, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1175607783.

MLA Handbook (7^th Edition):

Bhargava, Sphurti. “Submicron Structures, Electrospinning and Filters.” 2007. Web. 22 Sep 2019.

Vancouver:

Bhargava S. Submicron Structures, Electrospinning and Filters. [Internet] [Doctoral dissertation]. University of Akron; 2007. [cited 2019 Sep 22]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1175607783.

Council of Science Editors:

Bhargava S. Submicron Structures, Electrospinning and Filters. [Doctoral Dissertation]. University of Akron; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1175607783

University of Colorado

26. Hallowell, Spencer T. Modeling the Micro Behavior and Failure of Collagen Based Fibrous Materials.

Degree: MS, 2011, University of Colorado

URL: https://scholar.colorado.edu/cven_gradetds/230

► The field of tissue engineering has expanded vastly over the last decade. Due to difficulties in testing tissues in vivo, numerical models must be produced… (more)

Subjects/Keywords: collagen; failure; finite element; mechanics; modeling; Civil Engineering; Structures and Materials

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APA (6^th Edition):

Hallowell, S. T. (2011). Modeling the Micro Behavior and Failure of Collagen Based Fibrous Materials. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/cven_gradetds/230

Chicago Manual of Style (16^th Edition):

Hallowell, Spencer T. “Modeling the Micro Behavior and Failure of Collagen Based Fibrous Materials.” 2011. Masters Thesis, University of Colorado. Accessed September 22, 2019. https://scholar.colorado.edu/cven_gradetds/230.

MLA Handbook (7^th Edition):

Hallowell, Spencer T. “Modeling the Micro Behavior and Failure of Collagen Based Fibrous Materials.” 2011. Web. 22 Sep 2019.

Vancouver:

Hallowell ST. Modeling the Micro Behavior and Failure of Collagen Based Fibrous Materials. [Internet] [Masters thesis]. University of Colorado; 2011. [cited 2019 Sep 22]. Available from: https://scholar.colorado.edu/cven_gradetds/230.

Council of Science Editors:

Hallowell ST. Modeling the Micro Behavior and Failure of Collagen Based Fibrous Materials. [Masters Thesis]. University of Colorado; 2011. Available from: https://scholar.colorado.edu/cven_gradetds/230

Virginia Tech

27. Zhang, Zhiye. Modeling, Analysis, and Experiments of Inter Fiber Yarn Compaction Effects in Braided Composite Actuators.

Degree: PhD, Aerospace and Ocean Engineering, 2012, Virginia Tech

URL: http://hdl.handle.net/10919/29162

► The braided composite actuator is a pressure-driven muscle-like actuator capable of large displacements as well as large blocking forces. It consists of an elastomeric tube… (more)

Subjects/Keywords: Braided Composite Actuators; Variable Stiffness Structures; Compaction Model; Smart Materials

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APA (6^th Edition):

Zhang, Z. (2012). Modeling, Analysis, and Experiments of Inter Fiber Yarn Compaction Effects in Braided Composite Actuators. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/29162

Chicago Manual of Style (16^th Edition):

Zhang, Zhiye. “Modeling, Analysis, and Experiments of Inter Fiber Yarn Compaction Effects in Braided Composite Actuators.” 2012. Doctoral Dissertation, Virginia Tech. Accessed September 22, 2019. http://hdl.handle.net/10919/29162.

MLA Handbook (7^th Edition):

Zhang, Zhiye. “Modeling, Analysis, and Experiments of Inter Fiber Yarn Compaction Effects in Braided Composite Actuators.” 2012. Web. 22 Sep 2019.

Vancouver:

Zhang Z. Modeling, Analysis, and Experiments of Inter Fiber Yarn Compaction Effects in Braided Composite Actuators. [Internet] [Doctoral dissertation]. Virginia Tech; 2012. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/10919/29162.

Council of Science Editors:

Zhang Z. Modeling, Analysis, and Experiments of Inter Fiber Yarn Compaction Effects in Braided Composite Actuators. [Doctoral Dissertation]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/29162

28. Tafoya, Justin A. Effect of Sustainable and Composite Materials on the Mechanical Behavior of Sandwich Panels under Edgewise Compressive Loading.

Degree: MS, Aerospace Engineering, 2015, Cal Poly

URL: https://digitalcommons.calpoly.edu/theses/1362 ; 10.15368/theses.2015.18

► Over the last three decades, the aerospace industry has gradually shifted from metals to composites in many different applications due to the lightweight properties… (more)

▼ Over the last three decades, the aerospace industry has gradually shifted from metals to composites in many different applications due to the lightweight properties of composite materials. Some benefits of composites include higher strength-to-weight ratio and corrosion resistance. At this point in time, the composite industry researchers are focusing on renewable and sustainable materials (bio-composites). By understanding the structural capabilities of bio-composites that have been used for centuries, new developments of sustainable materials will spark more interest throughout the industry. Bio-composites include fibers such as hemp, bamboo, flax, etc. The high demand for bio-composites in composite structures can also reduce raw material costs. This study investigated, through experimental and numerical analysis, the mechanical behavior of sandwich panels under edgewise compressive loading. The first task of the study was to use four different facesheet materials and the same Nomex honeycomb core. The number of facesheet layers consecutively increased from one layer to four layers on each side of the core for each material. The facesheet materials used were Hexply AGP280-5H Carbon Fiber Pre-Preg, B601 Plain Weave Hemp, D118DKBR Split Herringbone Weave Hemp, and NB308T 7725 Texalium Fiberglass Pre-Preg. The sandwich panels were cured using a composite heat press and followed the recommended cure cycle for the material’s resin matrix. The variation of the facesheet materials while keeping the core consistent showed how the edgewise strength and displacement of the composite sandwiches were affected under compressive loading. The second task of the study was to try and create a multifunctional hybrid composite sandwich with two different facesheet materials; using one hemp material and one pre-preg material. The goal of this task was to try and minimize the damage occured upon failure. Being that the pre-preg materials are more brittle than the hemp material, the hybrid composite sandwiches can potentially create a superior composite structure. The sequence of stacking of the facesheet materials was manipulated to study how changing the outer and inner layers affected the results. All the specimen were loaded at a rate of 0.05 in/min in a steel jig specifically made per ASTM C364 standard using an Instron 8801 to determine the mechanical behavior. These experimental results combined with results from theoretical and finite element analysis using Matlab and Abaqus, respectively, were used to compare composite sandwich designs under compressive loadings. Failure mode comparison between the individual material composites and the hybrid composites were also discussed. Advisors/Committee Members: Faysal Kolkailah.

Subjects/Keywords: Structures and Materials

…today’s fibrous materials, composite structures have evolved a long way from the old mud and… …2 MANUFACTURING AND TESTING PROCEDURES 2.1 2.2 Composite Sandwich Design and Materials… …Testing of Composite Sandwich Constituent Materials 28 2.3.1 Preparing Specimen… …Ratio Testing Results . . . . . . . . . . . . . 44 3.1.5 Shear Moduli of Facesheet Materials… …45 3.1.6 Fiber Volume Fractions for Facesheet Materials . . . . . . . . . . . 45 3.1.7…

10 more images…

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APA (6^th Edition):

Tafoya, J. A. (2015). Effect of Sustainable and Composite Materials on the Mechanical Behavior of Sandwich Panels under Edgewise Compressive Loading. (Masters Thesis). Cal Poly. Retrieved from https://digitalcommons.calpoly.edu/theses/1362 ; 10.15368/theses.2015.18

Chicago Manual of Style (16^th Edition):

Tafoya, Justin A. “Effect of Sustainable and Composite Materials on the Mechanical Behavior of Sandwich Panels under Edgewise Compressive Loading.” 2015. Masters Thesis, Cal Poly. Accessed September 22, 2019. https://digitalcommons.calpoly.edu/theses/1362 ; 10.15368/theses.2015.18.

MLA Handbook (7^th Edition):

Tafoya, Justin A. “Effect of Sustainable and Composite Materials on the Mechanical Behavior of Sandwich Panels under Edgewise Compressive Loading.” 2015. Web. 22 Sep 2019.

Vancouver:

Tafoya JA. Effect of Sustainable and Composite Materials on the Mechanical Behavior of Sandwich Panels under Edgewise Compressive Loading. [Internet] [Masters thesis]. Cal Poly; 2015. [cited 2019 Sep 22]. Available from: https://digitalcommons.calpoly.edu/theses/1362 ; 10.15368/theses.2015.18.

Council of Science Editors:

Tafoya JA. Effect of Sustainable and Composite Materials on the Mechanical Behavior of Sandwich Panels under Edgewise Compressive Loading. [Masters Thesis]. Cal Poly; 2015. Available from: https://digitalcommons.calpoly.edu/theses/1362 ; 10.15368/theses.2015.18

29. Woo, Thomas Robert. Effects of Seawater on the Mechanical Behavior of Composite Sandwich Panels Under Monotonic Shear Loading.

Degree: MS, Aerospace Engineering, 2012, Cal Poly

URL: https://digitalcommons.calpoly.edu/theses/898 ; 10.15368/theses.2012.219

► <h1>Abstract</h1> Salt water environments are very harsh on materials that are used within them. Many issues are caused by either corrosion and/or internal degradation to… (more)

▼ <h1>Abstract</h1> Salt water environments are very harsh on materials that are used within them. Many issues are caused by either corrosion and/or internal degradation to the materials themselves. Composites are better suited for this environment due to their high strength to weight ratios and their corrosion resistance, but very little is known about the fracture mechanics of composites. The goal of this study is to gain a better understanding for the behavior of a composite boat hull under a shear loading, similar to the force water applies on the hull as the boat moves through the water; then attempt to strengthen the composite sandwich panel against the shear loading. A parametric study was conducted to investigate monotonic in-plane shear loading for composite sandwich panels used in commercial naval vessels. In order to model a conventional composite boat hull, test specimens were composite sandwich panels made of a Divinycell H100 foam core with four layers of fiberglass on both sides of the core. Specimens were tested under a monotonic loading with a rate of 0.2 in/min, and tested until complete failure using the standard test. Seawater specimens were manufactured in the same manner as the original test specimens, but then were submersed in either filtered seawater or the ocean. The differences between the filtered pieces and the ocean allowed us to determine if any changes found in the composite sandwich panels were related to environment conditions or if the changes were related to the saltwater interaction itself. To create these different environments the seawater specimens were taken to the Avila pier where 36 specimens were placed in a tub that was fed filtered saltwater, while 30 specimens were placed in a plastic mesh with weights and lowered to a depth of approximately 30 ft. in the ocean. Three specimens were then removed at monthly intervals from both filtered and ocean environments. Shear Keys were created as a method to strengthen the composite sandwich panels against the shear force that the previous specimens had been tested to. Eight Shear Keys were then placed into groves cut into the foam core (four on each side) and the four fiberglass layers were laid on top. Testing showed that the seawater did have an initial effect on the composite sandwich panels. The filtered pieces showed a decrease in yield strength and stiffness the longer they were subjected to the seawater. The raw unfiltered pieces placed in the ocean saw an even higher decrease in their yield strength and decrease in stiffness. However, for both the unfiltered and raw specimens there was an increase in the ultimate strength and fracture point of the specimens. The effects of the sea water seemed to taper off after the 3^rd month however. The Shear Key specimens were tested with a 4mm and an 8mm Shear Key. The 8mm Shear Keys showed a decrease in shear strength, which was primarily due to removing too much material from the core and weakening the specimen. It was… Advisors/Committee Members: Faysal Kolkailah.

Subjects/Keywords: Structures and Materials

…Cal Poly Aerospace structures INSTRON computer. 38 Figure 32: Test specimen where failure… …stronger materials to help improve efficiency, reliability, and performance of current and/or… …materials have become a major part of almost every aspect of engineering in today’s world. As the… …technology has evolved so has the demand for new materials that can meet very specific requirements… …create bricks used for building structures. Since then, people have vastly improved the…

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APA (6^th Edition):

Woo, T. R. (2012). Effects of Seawater on the Mechanical Behavior of Composite Sandwich Panels Under Monotonic Shear Loading. (Masters Thesis). Cal Poly. Retrieved from https://digitalcommons.calpoly.edu/theses/898 ; 10.15368/theses.2012.219

Chicago Manual of Style (16^th Edition):

Woo, Thomas Robert. “Effects of Seawater on the Mechanical Behavior of Composite Sandwich Panels Under Monotonic Shear Loading.” 2012. Masters Thesis, Cal Poly. Accessed September 22, 2019. https://digitalcommons.calpoly.edu/theses/898 ; 10.15368/theses.2012.219.

MLA Handbook (7^th Edition):

Woo, Thomas Robert. “Effects of Seawater on the Mechanical Behavior of Composite Sandwich Panels Under Monotonic Shear Loading.” 2012. Web. 22 Sep 2019.

Vancouver:

Woo TR. Effects of Seawater on the Mechanical Behavior of Composite Sandwich Panels Under Monotonic Shear Loading. [Internet] [Masters thesis]. Cal Poly; 2012. [cited 2019 Sep 22]. Available from: https://digitalcommons.calpoly.edu/theses/898 ; 10.15368/theses.2012.219.

Council of Science Editors:

Woo TR. Effects of Seawater on the Mechanical Behavior of Composite Sandwich Panels Under Monotonic Shear Loading. [Masters Thesis]. Cal Poly; 2012. Available from: https://digitalcommons.calpoly.edu/theses/898 ; 10.15368/theses.2012.219

30. St-Pierre, Luc. The quasi-static and dynamic responses of metallic sandwich structures .

Degree: 2012, University of Cambridge

URL: http://www.dspace.cam.ac.uk/handle/1810/243443

► Lattice materials are used as the core of sandwich panels to construct light and strong structures. This thesis focuses on metallic sandwich structures and has… (more)

▼ Lattice materials are used as the core of sandwich panels to construct light and strong structures. This thesis focuses on metallic sandwich structures and has two main objectives: (i) explore how a surface treatment can improve the strength of a lattice material and (ii) investigate the collapse response of two competing prismatic sandwich cores employed in ship hulls. First, the finite element method is used to examine the effect of carburisation and strain hardening upon the compressive response of a pyramidal lattice made from hollow tubes or solid struts. The carburisation surface treatment increases the yield strength of the material, but its effects on pyramidal lattices are not known. Here, it is demonstrated that carburisation increases the plastic buckling strength of the lattice and reduces the slenderness ratio at which the transition from plastic to elastic buckling occurs. The predictions also showed that strain hardening increases the compressive strength of stocky lattices with a slenderness ratio inferior to ten, but without affecting the collapse mode of the lattice. Second, the quasi-static three-point bending responses of simply supported and clamped sandwich beams with a corrugated core or a Y-frame core are compared via experiments and finite element simulations. The role of the face-sheets is assessed by considering beams with (i) front-and-back faces present and (ii) front face present, but back face absent. These two beam designs are used to represent single hull and double hull ship structures, and they are compared on an equal mass basis by doubling the thickness of the front face when the back face is absent. Beams with a corrugated core are found to be slightly stronger than those with a Y-frame core, and two collapse mechanisms are identified depending upon beam span. Short beams collapse by indentation and for this collapse mechanism, beams without a back face outperform those with front-and back faces present. In contrast, long beams fail by Brazier plastic buckling and for this collapse mechanism, the presence of a back face strengthens the beam. Third, drop weight tests with an impact velocity of 5 m/s are performed on simply supported and clamped sandwich beams with a corrugated core or a Y-frame core. These tests are conducted to mimic the response of a sandwich hull in a ship collision. The responses measured at 5 m/s are found to be slightly stronger than those measured quasi-statically. The measurements are in reasonable agreement with finite element predictions. In addition, the finite element method is used to investigate whether the collapse mechanism at 5 m/s is different from the one obtained quasi-statically. The predictions indicate that sandwich beams that collapse quasi-statically by indentation also fail by indentation at 5 m/s. In contrast, the simulations for beams that fail quasi-statically by Brazier plastic buckling show that they collapse by indentation at 5 m/s. Finally, the dynamic indentation response of sandwich panels with a corrugated core or a Y-frame core… Advisors/Committee Members: Fleck, Norman (advisor).

Subjects/Keywords: Sandwich structures; Lattice materials

…22 vii 2.3 Lattice materials and sandwich structures under dynamic loading . . 23 2.3.1… …Dynamic compressive response of lattice materials . . . . . . . 24 2.3.2 Sandwich structures… …lattice materials, and new structural designs, such as sandwich structures. These two examples… …and dynamic behaviour of sandwich structures. The concepts of lattice materials and sandwich… …structures are both introduced below, followed by the scope of this thesis. 1.1 Lattice materials…

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

APA (6^th Edition):

St-Pierre, L. (2012). The quasi-static and dynamic responses of metallic sandwich structures . (Thesis). University of Cambridge. Retrieved from http://www.dspace.cam.ac.uk/handle/1810/243443

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):

St-Pierre, Luc. “The quasi-static and dynamic responses of metallic sandwich structures .” 2012. Thesis, University of Cambridge. Accessed September 22, 2019. http://www.dspace.cam.ac.uk/handle/1810/243443.

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

MLA Handbook (7^th Edition):

St-Pierre, Luc. “The quasi-static and dynamic responses of metallic sandwich structures .” 2012. Web. 22 Sep 2019.

Vancouver:

St-Pierre L. The quasi-static and dynamic responses of metallic sandwich structures . [Internet] [Thesis]. University of Cambridge; 2012. [cited 2019 Sep 22]. Available from: http://www.dspace.cam.ac.uk/handle/1810/243443.

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

Council of Science Editors:

St-Pierre L. The quasi-static and dynamic responses of metallic sandwich structures . [Thesis]. University of Cambridge; 2012. Available from: http://www.dspace.cam.ac.uk/handle/1810/243443

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

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