Dissertation/Thesis Abstract

Investigation of Porosity Evolution and Orthotropic Axes on Anisotropic Materials
by Rahimi, Raheleh Mohammad, M.S., Southern Illinois University at Edwardsville, 2014, 62; 1564168
Abstract (Summary)

Advancement of porosities that happens in shear deformation of anisotropic materials is investigated by Dr. Kweon. As the hydrostatic stress in shear deformation is zero, in the solid mechanics' researches it is proved several times that porosity will not be expanded in shear deformation. Dr. Kweon showed that this statement can be wrong in large deformation of simple shear. He proposed anisotropic ductile fracture model to show that hydrostatic stress becomes nonzero and porosities are increased in the simple shear deformation of anisotropic materials. This study investigates the effect of the evolution of anisotropy which means the rotation of the orthotropic axes onto the porosity changes. Hill coefficient shows that how orthotropic materials indicate different ductile fracture manners in shear deformation. Also the effect of void aspect ratio on change of porosity is investigated. It has been found that the interaction among porosity, the matrix anisotropy and void aspect ratio play a crucial role in the ductile damage of porous materials.

Indexing (document details)
Advisor: Kweon, Soondo
Commitee: Wang, Fengxia, Yan, Terry
School: Southern Illinois University at Edwardsville
Department: Mechanical and Industrial Engineering
School Location: United States -- Illinois
Source: MAI 53/05M(E), Masters Abstracts International
Subjects: Materials science
Keywords: Anisotropic materials, Orthotropic axes, Porosity evolution, Shear deformation
Publication Number: 1564168
ISBN: 978-1-321-15374-3
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