A damage-effect-involved phenomenological crystal plasticity model and computational methods for mechanical responses of FeCrAl alloys. (September 2021)

• Record Type: Journal Article
• Authors: Zhang, Jingyu; Ding, Shurong; Du, Shiyu
• Is Part Of: Materials today communications. Volume 28(2021)
• Publication Date: 2021-09
• Subjects: Crystal plasticity -- Continuum damage mechanics -- FeCrAl -- Yield strength -- Ultimate tensile strength; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2021.102595
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: In this study, a new damage-effect-involved phenomenological crystal plasticity model is proposed to capture macroscale straining hardening and strain softening behaviors of iron chromium aluminum (FeCrAl) alloys. The constitutive model is described with co-rotational tensors. Damage factor evolves with the effective plastic work calculated by the resolved shear stress and shear strain rate on all slip systems. A stress update algorithm is specially established, and the corresponding self-defined subroutines are incorporated into the finite element analysis via VUMAT in ABAQUS/Explicit. Fast convergence can be achieved with the maximum value of damage factor set very close to 1. The simulated macroscale stress-strain curves can agree well with the experimental ones for various FeCrAl alloys. The yield strengths and ultimate tensile strengths of these alloys can be well captured. The dependence of damage model parameters on the processing conditions, alloy compositions are discussed and analyzed. This work provides a basis for the multiscale simulation research on the mechanical performances of polycrystal alloys. Highlights: A new damage-effect-involved phenomenological crystal plasticity theory framework is proposed. The three-dimensional constitutive relation is developed with co-rotational tensors. The evolution model of damage variable is defined with the resolved shear stress and shear rate over all slip systems. The obtained stress-strain curves could capture strain hardening and strain softening behaviors of polycrystals. These curves match the experimental data for FeCrAl alloys with different processing conditions and alloy compositions.