Characterisation and modelling of in-plane springback in a commercially pure titanium (CP-Ti)

S. Khayatzadeh, M. J. Thomas, Y. Millet, S. Rahimi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
35 Downloads (Pure)

Abstract

Effective prediction of springback during sheet metal forming is critically important for automotive and aerospace industries, especially when forming metals with high strength to weight ratio such as Titanium. This requires materials mechanical data during plastic deformation and their dependencies on parameters like strain, strain rate and sample orientation. In this study, springback is quantified experimentally as elastic strain recovery, degradation in Young’s modulus and inelastic strain recovery on unloading in a commercially pure titanium type 50A (CP-Ti-50A). The results show strain rate dependent anisotropic mechanical behaviours and a degradation in Young’s modulus with increased level of plastic deformation. The level of degradation in Young’s modules increases gradually from 13% for samples parallel to the rolling direction (RD) to 20% for those perpendicular to the RD. A measurable non-linear strain recovery was also observed on unloading that is orientation dependent. The level of springback is characterised as the sum of elastic recovery and the contributions from both the degradation in Young’s modulus and anelastic strain recovery. It is shown that the Chord modulus can estimate springback with a reasonable accuracy taking into consideration the elastic strain recovery, degradation in Young’s modulus and anelastic strain recovery.
Original languageEnglish
Number of pages21
JournalJournal of Materials Science
Early online date17 Jan 2018
DOIs
Publication statusE-pub ahead of print - 17 Jan 2018

Keywords

  • CP titanium
  • anisotropy
  • strain rate
  • plastic deformation
  • elastic modulus
  • springback

Fingerprint Dive into the research topics of 'Characterisation and modelling of in-plane springback in a commercially pure titanium (CP-Ti)'. Together they form a unique fingerprint.

Cite this