Sensitivity of Crystal Stress Distributions to the Definition of Virtual Two-Phase Microstructures

TL;DR

This paper investigates how different definitions of virtual two-phase microstructures affect stress distribution simulations, aiding understanding of yielding in duplex stainless steel through finite element analysis and experimental validation.

Contribution

It systematically analyzes the sensitivity of stress distributions to microstructure definitions and incorporates phase and grain morphology in virtual sample creation.

Findings

Stress distributions are highly sensitive to microstructure definitions.

Finite element simulations align with experimental stress-strain data.

Morphology inclusion improves simulation accuracy.

Abstract

A systematic study of the sensitivities of simulation input on the computed stress distributions in two-phase microstructures is presented. The study supports a related investigation of the initiation and propagation of yielding in duplex stainless steel. Considered in the study are the identification of constitutive model parameters for the single-crystal elastic and plastic behaviors and the importance of including dominant phase and grain morphologies in the instantiation of virtual samples. Behaviors computed using a finite element formulation are evaluated against experimental data for the macroscopic stress-strain behavior and against lattice strain data measured by neutron diffraction under in situ loading.