Volume 1, 2009DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
|Page(s)||801 - 807|
|Published online||15 September 2009|
Effect of pre-straining on localisation and fracture of dual-phase steel at elevated rates of strainV. 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
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.
© EDP Sciences 2009