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| Study on Limit Formability of 1 000 MPa Dual Phase Steel |
| (1.Technical Center, SAIC Motor, Shanghai 2018041, China; 2. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China; 3. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China） |
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Abstract Through the cup drawing test, the onset crack and limiting drawing ratio (LDR) of 1 000 MPa dual phase (DP) steel were identified. Three yielding models: Hill, Barlat and BBC were compared in the numerical simulation. The results show that LDR of 1 000 MPa DP steel is 2.07. And Barlat yield criterion is suitable for actual test. Unlike traditional sheet materials whose crack has obvious necking, the crack mode of 1 000 MPa DP is a tensile shear fracture and cracks are on alternating 45° planes, through thickness.
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Received: 29 December 2010
Published: 30 November 2011
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