Archive | 2019
Numerical simulation of deformation and fracture in polycrystalline aluminum at different strain rates
Abstract
The aim of the paper is to investigate numerically the influence of the strain rate on the stress-strain localization and fracture in polycrystalline aluminum samples. The method of step-by-step packing is used to generate a three-dimensional polycrystalline structure. Thermo-mechanical viscoplastic constitutive equation is developed to describe the strain rate sensitivity of the aluminum alloy 6061-T6. The model parameters are determined to fit experimental data on dynamic deformation of the aluminum alloy over the range of strain rates from 1 to 500 s−1. Calculations for tension and compression of the homogeneous and polycrystalline samples are performed using the ABAQUS/Explicit. Fracture patterns are shown to depend on the strain rate.The aim of the paper is to investigate numerically the influence of the strain rate on the stress-strain localization and fracture in polycrystalline aluminum samples. The method of step-by-step packing is used to generate a three-dimensional polycrystalline structure. Thermo-mechanical viscoplastic constitutive equation is developed to describe the strain rate sensitivity of the aluminum alloy 6061-T6. The model parameters are determined to fit experimental data on dynamic deformation of the aluminum alloy over the range of strain rates from 1 to 500 s−1. Calculations for tension and compression of the homogeneous and polycrystalline samples are performed using the ABAQUS/Explicit. Fracture patterns are shown to depend on the strain rate.