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Nonlinear FEA of the Crush Behaviour of Functionally Graded Foam-filled ColumnsNouraei, Hooman 13 January 2011 (has links)
The use of metallic foams as a filler in thin-walled structures can enhance their crashworthiness characteristics. It is believed that, tailoring the properties of the foam filler would enhance the effectiveness of these characteristics. This view is also supported by recent works in the literature. It is the objective of this study to examine the crush behaviour of functionally graded foam-filled tubes and evaluate the effect of discretely graded density upon the specific energy absorbed. Nonlinear parametric finite element simulations of the foam-filled tube were developed to estimate the most favourable foam density gradient in the lateral and axial directions. The effect of various design parameters such as density grading, number of grading layers, and thickness of the interactive layer upon the resulting specific energy absorption was investigated. The results show that the specific energy absorption of a tube filled with functionally graded foam is better than uniform density foam.
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Assessing the possibility of a functionally discontinuous biological paradigmSchroeder, James William 25 April 2007 (has links)
This project sets as its goal the development of an Intelligent Design paradigm that
makes falsifiable predictions. According to Karl Popper, such falsifiability is a key
component of scientific theories. To accomplish this, two hypothetical historical narratives
are first outlined based on guided processes and the design points they predict.
A biochemical approach to characterizing organisms then defines a protein's global
functional limits as determining the set of amino acids that allow it to successfully perform
its functions in any situation. The local functional limits restrict this potential substitution
set to only those proteins viable within an individual genetic background.
Proteins are referred to as the first-order of specified complexity because a
protein's gene is the fundamental unit of inheritance. Other orders of specified complexity
are described culminating in the organism level, which is the fundamental unit of selection.
Each phylogenetic tree within the two intelligent design scenarios is founded by an
original group or archetype. The descendants of this archetype are known as the
archetype's genus. Speciation events within the genus are brought about by a slow process
called co-adapted drift that creates distinct species through functional incompatibilities. A theory of natural selection is developed that attempts to characterize the
relationship between the gene and the organism. Natural selection in this sense is
described as a preservation mechanism that selects against deleterious phenotypes instead
of selecting for beneficial ones.
Finally, a practical methodology is developed that begins by determining the
history of a gene in a given species by the symmetrical causal relationships of the alleles
and the species allelic distribution. The original alleles in this species and their local
functional limits are then compared with those of analogous genes in similar species to
determine if these species were functionally compatible at that time. The two Intelligent
Design paradigms predict patterns of incompatibilities, or design points, where guided
actions were involved. This is a falsifiable prediction that raises the status of these
paradigms in a Popperian sense.
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A study of mixed-mode dynamic fracture in advanced particulate composites by optical interferometry, digital image correlation and finite element methodsKirugulige, Madhusudhana S., January 2007 (has links) (PDF)
Thesis (Ph.D.)--Auburn University, 2007. / Abstract. Vita. Includes bibliographic references (ℓ. 156-163)
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Experiment and analytical evaluation of dynamic fracture in graded multifunctional materials /Jain, Nitesh. January 2005 (has links)
Thesis (Ph.D.) -- University of Rhode Island, 2005. / Typescript. Includes bibliographical references (leaves 201-207).
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Numerical analysis of plane cracks in strain-gradient elastic materialsAkarapu, Sreekanth, January 2005 (has links) (PDF)
Thesis (M.S.)--Washington State University, December 2005. / Includes bibliographical references.
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An experimental and analytical study of graded materials under thermo-mechanical dynamic loading /Kidane, Addis Asmelash. January 2009 (has links)
Thesis (Ph.D.) -- University of Rhode Island, 2009. / Typescript. Includes bibliographical references (leaves 171-177).
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Thermoelastic analysis and optimization of functionally graded plates and shells /Pelletier, Jacob Leo. January 2005 (has links) (PDF)
Thesis (M.S.) in Mechanical Engineering--University of Maine, 2005. / Includes vita. Includes bibliographical references (leaves 148-154).
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Methodology for the Thermomechanical Simulation and Optimization of Functionally Graded MaterialsGoupee, Andrew January 2005 (has links) (PDF)
No description available.
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Thermoelastic Analysis and Optimization of Functionally Graded Plates and ShellsPelletier, Jacob Leo January 2005 (has links) (PDF)
No description available.
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Modelling and prototyping of heterogeneous solid CAD modelsSiu, Yan-kit., 邵仁傑. January 2003 (has links)
published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy
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