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Study of curvature and pre-damage effects on the edge stretchability of advanced high strength steel based on a new simulation model

  • Thematic Issue: Formability of metallic materials
  • Published:
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Abstract

Edge cracking is one of the common failures during the stamping of Advanced High Strength Steel(AHSS). The limit strains of the edge are hard to predict by traditional methods because edge formability is influenced by many factors such as edge quality, process parameters, material properties and so on. Hole expansion tests are conducted with DP780 under three hole diameters and two punching clearances to investigate the effects of curvature and pre-damage caused by punching on edge stretchability. The corresponding simulations are carried out meanwhile with a new model based on Marciniak and Kuczynski (M-K) model and Hill’s localized necking theory to predict the edge limit strain. This new model is proposed for the hole edge with pre-damage and improves the predictability of edge cracking in hole-expansion simulation. The problem that the traditional ideal model fails to predict the hole expansion ratio (HER) of pre-damage edge is also successfully solved by the new model with the use of the Damage Zone and Effective Failure Strain Ratio (EFSR). The comparison between the experiments and simulations reveals that this new model can be used in edge forming failure prediction of AHSS.

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Acknowledgments

The authors would like to thank financial support from National Natural Science Foundation of China (51105246).

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Authors and Affiliations

  1. Institute of Forming Technology and Equipment, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China

    Chenjue Ye, Jieshi Chen & Xiangyu Yu

  2. Research and Innovation Center, Ford Motor Company, Dearborn, MI, 48121, USA

    Cedric Xia

Authors
  1. Chenjue Ye
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  2. Jieshi Chen
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  3. Cedric Xia
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  4. Xiangyu Yu
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Correspondence to Jieshi Chen.

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Ye, C., Chen, J., Xia, C. et al. Study of curvature and pre-damage effects on the edge stretchability of advanced high strength steel based on a new simulation model. Int J Mater Form 9, 269–276 (2016). https://doi.org/10.1007/s12289-014-1197-4

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  • DOI: https://doi.org/10.1007/s12289-014-1197-4

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