Mechanical Engineering ETDs

Publication Date

Summer 7-29-2025

Abstract

Plastic deformation is the process in which the material deforms permanently due to external effects. Twinning and slip are two main mechanisms of plastic deformation in metallic materials. The prominent mechanism of plastic deformation in metals that have FCC crystal structures is slip or gliding movement of dislocations, which is mainly focused on here. In the current study, frameworks for investigating plasticity phenomena of metals at different scales ranging from microscale to macroscale are demonstrated. Specifically, the macroscale modeling of plastic response of metallic materials induced by indentations are emulated by nonlinear FEA simulations. Simulation results of macroscale modeling are validated by systematic indentation tests. In the microscale framework, plasticity phenomena in metallic materials are determined by three-dimensional discrete dislocation dynamics (3D DDD) simulations. DDD simulation results are verified and validated by comparing them with analytical solutions, other numerical results and experimental results.

Keywords

metals, plasticity, FEA, 3D DDD, multiscale

Degree Name

Mechanical Engineering

Level of Degree

Doctoral

Department Name

Mechanical Engineering

First Committee Member (Chair)

Tariq Khraishi

Second Committee Member

Yu-Lin Shen

Third Committee Member

Heng Zuo

Fourth Committee Member

Rafiqul Tarefder

Document Type

Dissertation

Language

English

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