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| Experimental Study of Shear Fracture on Advanced High Strength Dual-Phase Steels |
| (Shanghai Key Laboratory of Digital Autobody Engineering, Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract Fracture characteristics of advanced high strength DP(dual-phase) sheets in stretch-bending over a tight die radius were investigated through flanging and groove-shape dies. Flanging result shows the higher the strength grade of DP sheet is, the more chance shear fracture occurs. The groove-shape tests and simulations suggest the shear fracture around the tight radius only occurs under high BHF, and necking on the wall happens when BHF is low. The eventual failure mode during sheet metal forming operations of AHSS is viewed as the competition between necking and shear fracture, whichever criterion is satisfied first.
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Received: 22 October 2010
Published: 30 November 2011
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