Crystal plasticity analysis of severe plastic deformation processes

Date

2024-3

Author

Şimşek, Ülke

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Advancements in technology for the creation, characterization, modeling, design, and application of nanostructured materials are essential for maintaining competitiveness in the global industrial design and manufacturing market. Recently, processing extremely fine-grained metals through severe plastic deformation (SPD) techniques has reached a critical phase in development. Sufficient laboratory findings are available to demonstrate the overall viability of this approach, and it is widely acknowledged that these materials hold significant innovation potential. The present work aims to conduct numerical investigations into the severe plastic deformation behaviors of metallic materials using both classical continuum and microscale approaches based on finite element method (FEM) simulations. Microscale analysis bridges the gap between continuum plasticity theory and the textural characteristics of metallic materials. By controlling the microstructural features and texture of metallic materials, it becomes possible to improve properties such as strength, fatigue resistance, resilience, and machinability. Finite Element simulations typically utilize two types of algorithms for simulating metal forming processes: implicit and explicit. These processes involve geometric nonlinearities, material nonlinearities, and variable contact problems. The explicit solution technique offers particular advantages when analyzing large three-dimensional contact problems, making it applicable to metal forming simulations and providing simplicity in solving dynamic contact frictions. An explicit crystal plasticity finite element method (CPFEM) model is developed to systematically understand the deformation behavior and texture evolution of single crystals and polycrystalline materials during full-scale SPD processes.

Subject Keywords

Severe Plastic Deformations, Finite Element Method, Continuum Mechanics, Microscale Mechanics, Crystal Plasticity, Texture Analysis

URI

https://hdl.handle.net/11511/109187

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Graduate School of Natural and Applied Sciences, Thesis