In this work, the stretch-flangeability of dual phase (DP) steels was investigated through the hole expansion (HE) tests for three DP980 steel sheet samples. In order to understand the effect of hole surface quality on the HE results, the specimens were prepared with three hole machining methods, namely, electrical discharge machining (EDM), punching and laser cutting. The HE results were discussed in terms of the hole surface quality before and after testing. Moreover, the failure behaviour was analyzed based on the observations of the fracture surfaces using optical microscopy (OM) and scanning electron microscopy (SEM).
Revised: July 27, 2015 |
Published: June 1, 2012
Citation
Xu L., F. Barlat, M. Lee, K. Choi, and X. Sun. 2012.Hole expansion of dual phase steels. In International Conference on High Performance Structures and Materials VI (HPSM 2012), WIT Transactions on The Built Environment, June 19-21, 2012, New Forest, United Kingdom, edited by WP De Wilde, CA Brebbia and S Hernandez, 124, 75-83. Southampton:WIT Press.PNNL-SA-87799.