Effect of pre-straining on localisation and fracture of dual-phase steel at elevated rates of strain

V. Tarigopula; O. Hopperstad; A. Clausen; M. Langseth

doi:doi:10.1051/dymat/2009112

All issues

Volume 1 (2009)

10.1051/dymat/2009112

Abstract

Issue		DYMAT 2009 Volume 1, 2009 DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading


Page(s)		801 - 807
Section		Industrial Applications
DOI		https://doi.org/10.1051/dymat/2009112
Published online		15 September 2009

DYMAT 2009 (2009) 801-807
DOI: 10.1051/dymat/2009112

Effect of pre-straining on localisation and fracture of dual-phase steel at elevated rates of strain

V. Tarigopula, O. Hopperstad, A. Clausen and M. Langseth

SIMLab, Centre for Research-based Innovation and Department of Structural Engineering, Norwegian University of Science and Technology, Trondheim, Norway

Published online: 15 September 2009

Abstract
The present paper is aimed at studying the effect of pre-straining on the localisation and fracture in dual-phase steel under dynamic loading conditions. This study was conducted by using tensile tests at elevated rates of strain.A dual-phase steel DP800 sheet of thickness 1.5 mm was pre-deformed to three different levels of effective strain 1%, 4% and 8%. Thereafter, sub-size tensile specimens were machined from the pre-deformed sheets in the pre-strained direction. Tensile tests at elevated rates of strain in the range of 10⁻³ s⁻¹ to 10³ s⁻¹ were conducted by using a conventional servo-hydraulic machine and a split-Hopkinson tension bar. A high-speed video camera was used to record the sequence of deformation during testing. A full-field measurement technique, namely digital image correlation, was utilized to measure the local strains up to fracture from the recorded digital images. It was found out that the pre-straining and dynamic loading have a marked effect on the strain localisation and subsequent fracture.