Modeling differential permanent softening under strain-path changes in sheet metals using a modified distortional hardening model

In this study, a modified distortional hardening model is proposed based on the homogeneous yield-function based anisotropic hardening (HAH). An improvement is made to capture differential permanent softening (DPS) under strain-path changes in sheet metals, whereas the other anisotropic hardening fe...

Full description

Saved in:
Bibliographic Details
Published in:International journal of plasticity Vol. 133; p. 102789
Main Authors: Lee, Jinwoo, Bong, Hyuk Jong, Kim, Daeyong, Lee, Myoung-Gyu
Format: Journal Article
Language:English
Published: New York Elsevier Ltd 01.10.2020
Elsevier BV
Subjects:
Anisotropic hardening
Bauschinger effect
Constitutive model
Deep drawing
Distortion
Dual phase steels
Ferritic stainless steel
Ferritic stainless steels
Finite element
Finite element method
Hardening
Modelling
Softening
Springback
Strain-path change
Tension tests
Yield strength
Anisotropic hardening
Constitutive model
Strain-path change
Finite element
ISSN:0749-6419, 1879-2154
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this study, a modified distortional hardening model is proposed based on the homogeneous yield-function based anisotropic hardening (HAH). An improvement is made to capture differential permanent softening (DPS) under strain-path changes in sheet metals, whereas the other anisotropic hardening features such as the Bauschinger effect, transient behavior, and cross hardening phenomenon are retained as they are in the original HAH model. The modified HAH (M-HAH) model is implemented in a commercial finite element software using the user-defined material subroutine, and validated well by reproducing the flow stress behaviors after differently programmed strain-path changes for dual-phase steel, extra deep drawing quality steel, and ferritic stainless steel. Additionally, the M-HAH can simulate the DPS in two-step tension tests, which cannot be accurately modeled by the original HAH. Finally, the V-bending springback tests with pre-tensioned specimens are evaluated with different modeling schemes including the classical isotropic hardening, kinematic hardening and distortional hardening models. •A modified distortional hardening law for modeling differential permanent softening under strain path change is proposed.•The stress integration algorithm based on semi-implicit scheme is formulated.•The modified HAH model is validated by reproducing the flow stress behaviors after various strain-path change conditions.•V-bending springback with pre-strained specimen is better predicted by M-HAH model than the isotropic-kinematic hardening.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0749-6419
1879-2154
DOI:10.1016/j.ijplas.2020.102789