An Experimental and Numerical Investigation on the Twist Springback of Transformation Induced Plasticity 780 Steel Based on Different Hardening Models

  • Yan-Min Xie
  • Ren-Yong Huang
  • Wei Tang
  • Bei-Bei Pan
  • Fei Zhang
Regular Paper
  • 13 Downloads

Abstract

Investigation on twist springback is important to improve the accuracy of forming parts. In this paper, a double C rail made of transformation induced plasticity 780 (TRIP 780) steel is designed, and the stamping and twist springback are simulated with ABAQUS based on three different hardening models (including Ziegler, Johnson-Cook and combined hardening models). A new index for calculating the twist springback is proposed, which is based on the angle between two end section lines of the double C rail. The experimental results of twist springback are compared with the calculation results from three different hardening models. The calculation results based on combined hardening model are the closest to the experiment data. In order to compensate twist springback, a curved surface die is designed based on the geometric shape of the double C rail after twist springback. The stamping and twist springback are simulated based on the curved surface die and combined hardening model, and the twist springback is decreased obviously after compensation, which shows that the compensation of twist springback is effective.

Keywords

Transformation induced plasticity (TRIP) Hardening model Twist springback Springback compensation 

Nomenclature

dα

increment of back stress

dμ

undetermined constant

σ

flow stress

σ0

initial yield stress

α'

deviator of back stress component

σeq

equivalent stress

A, B, n, C, m

material properties

εeq

equivalent strain

εeq

equivalent strain rate

εeq

dimensionless equivalent strain rate

ε0

reference strain rate

T*

dimensionless temperature

Tr

reference temperature

Tm

melting temperature

α

back stress of kinematic hardening

R

isotropic hardening stress

b, c, Q, γ

undetermined coefficient

dεP

increment of plastic strain

dP

equivalent plastic strain rate

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Copyright information

© Korean Society for Precision Engineering and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Mechanical EngineeringSouthwest Jiaotong UniversityChengduChina

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