Affordable Access

Access to the full text

Constitutive Modeling of Asymmetric Hardening Behavior of Transformation-Induced Plasticity Steels

Authors
  • Jung, Jaebong1
  • Hur, Yong Chan1
  • Jun, Sungwook2
  • Lee, Hyun-Seok3
  • Kim, Byung-Min1
  • Kim, Ji Hoon1
  • 1 Pusan National University, School of Mechanical Engineering, Busan, 46241, Korea , Busan (South Korea)
  • 2 LG Electronics, Metal Forming Technology Team, 222 LG-ro, Jinwi-myeon, Pyeongtaek-si, Gyeonggi, 17709, Korea , Gyeonggi (South Korea)
  • 3 NARA Mold & Die Co., Ltd., Press Die Research Team, 675 Gongdan-ro, Seongsan-gu, Changwon-si, Gyeongnam, 51555, Korea , Gyeongnam (South Korea)
Type
Published Article
Journal
International Journal of Automotive Technology
Publisher
Springer-Verlag
Publication Date
Nov 06, 2019
Volume
20
Issue
Suppl 1
Pages
19–30
Identifiers
DOI: 10.1007/s12239-019-0124-6
Source
Springer Nature
Keywords
License
Yellow

Abstract

Transformation-induced plasticity (TRIP) steels are part of advanced high strength steels capable of phase transformation, having good strength and ductility. The transformation rate is known to be dependent on the stress state, which may lead to asymmetric hardening behaviour for TRIP steels with compressive flow stresses larger than tensile ones. Sheet stamping products of TRIP steels show complex springback because of the asymmetry in addition to the large strength, which will complicate the analysis of sheet metal forming processes. In this work, the asymmetric hardening behaviour of a TRIP steel with a tensile strength of 1180 MPa was measured using the sheet tension-compression tester. An asymmetric hardening model was developed by introducing an off-centred bounding surface for the kinematic back-stress evolution, to depict the asymmetric hardening behaviour. The model parameters of the proposed constitutive equations were obtained from the stressstrain curves under tension followed by compression. The stress-strain curves were well captured by the developed constitutive model, whereas the conventional symmetric model fails to describe the asymmetric hardening behaviour of the TRIP steel. For validation, load-displacement curve and springback angles of three-point bending test were compared with the predictions by the proposed model.

Report this publication

Statistics

Seen <100 times