Micromechanical modeling of metals using crystal plasticity-phase field method

Waseem Amin, Ruhr University Bochum, Bochum, Germany
Alexander Hartmaier, RUB, Bochum, Germany
Napat Vajragupta, RUB, Bochum, Germany

Understanding the mutual relationship among processing-property-structure plays leading role to optimize the material design performance. For this purpose extensive research has been done to simulate the mechanical behavior of material but only recently it was made possible with the availability of highly efficient computational resources to study 3D larger deformations in polycrystal systems at micromechanical level.

The large deformations stemming from micromechanical level in metals can more realistically predict the mechanical response of a material under certain set of loading conditions. This eventually leads to better qualitative and efficient material design and production.

In this work Phase field method being an efficient for the analysis of evolving microstructure and Strain Gradient Plasticity have been coupled in a opens source code OpenPhase to take advantage of computational capabilities of both methods. The mechanical response of FCC metals during uniaxial loads is simulated. Kock-Mecking's relation and Nye's Dislocation tensor have been taken into account to describe the evolution of statistically stored and geometrically necessary density respectively which drives the plastic deformation of metals. Stress-strain flow curves have been generated to analyze Hall-Petch relation and effect of different parameters on deformation behavior.

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