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Title: Crystal Plasticity Modeling and Simulation of Nanotwinned Metals
Keywords: Twinning, crystal plasticity, nanotwinned, discrete, modeling
Issue Date: 18-Jan-2013
Citation: SEYED HAMID REZA MIRKHANI (2013-01-18). Crystal Plasticity Modeling and Simulation of Nanotwinned Metals. ScholarBank@NUS Repository.
Abstract: This thesis presents the continuum micromechanics of nt FCC metals. Nanotwinned copper is used as a model material system. We focus on formulating and modeling the mechanics to describe the following characteristics reported in this model microstructure: (i) enhancement of yield strength with reduction in twin thickness, (ii) reduction in yield strength with decreasing twin thickness below a critical twin thickness, and (iii) migration of TBs under applied loads. The theoretical setting is developed using single crystal plasticity as a basis wherein the plastic slip on each slip system in an FCC crystal structure is modeled as a visco-plastic constitutive law arising from glide of dislocation ensembles. To model TB migration and yield softening, a TB-affected-zone is introduced that is endowed with an additional visco-plastic slip-law. Detailed micromechanics simulations and discussion of the strengthening, softening and TB migration in single-grained and polycrystalline topologies are presented.
Appears in Collections:Ph.D Theses (Open)

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