3D Image-Based Viscoplastic Response with Crystal Plasticity

An efficient digital FFT-based viscoplastic method was applied to calculating the viscoplastic stress-strain response on a 3D image of a serial sectioned nickel alloy. A single strain step under uniaxial tensile loading was calculated using crystal plasticity. Analysis of the results indicated higher stresses near grain boundaries than in the bulk of grains. All types of grain boundary gave similar results and no special cases, such as the twin boundaries, were identified. A new analysis for clusters of high stress points was introduced; the distribution of sizes of high stress clusters was found to be close to log-normal.