Dynamic deformation of polycrystalline metals under impact

Summary

The project aims to develop a physics-based crystal plasticity model for predicting the dynamic deformation of polycrystalline metals under the high-strain-rate and shock loading conditions. Combined experimental, numerical and theoretical approaches will be required for this project.

Supervisor(s)

Associate Professor Luming Shen

Research Location

Civil Engineering

Program Type

Masters/PHD

Synopsis

Examples of applications involving high strain rate loading include not only accidental events such as explosions and vehicle crashes, but also metal forming processes like extrusion, rolling and high-speed machining, where the strain rates can easily exceed 100 s-1. To understand the rate-dependent deformation of metals,  the Hopkinson bar facility together with TEM/EBSD microscopy will be used to investigate the effect of high strain rate on the microstructure evolution of polycrystalline metals. Metal specimens will be deformed at high strain rates to vary plastic strains and to generate deformed nano/micro-structures. The deformed materials will then be prepared for TEM/EBSD microscopy, with the hope that the resulting experimental understanding in combination with atomistic simulation of dislocation-precipitate interactions can be used to improve the predictive capability of the rate-dependent crystal plasticity model. The model will be implemented into a commercial FEM package through user-defined subroutines for predicting the dynamic deformation of polycrystalline metals under impact/shock loading. 

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Keywords

polycrystalline, metal, alloy, crystal plasticity, Hopkinson bar, TEM, EBSD, impact, FEM, microstructure

Opportunity ID

The opportunity ID for this research opportunity is: 1363

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