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A New Ductile Fracture Model for Edge Cracking Prediction of Ultra-High Strength Steel Considering Damage Accumulation in Blanking Process

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Abstract

Edge quality of ultra-high strength sheet blank seriously affects the formability of the downstream edge forming operation such as hole expansion and flanging. Since the influence of damage accumulation caused by blanking is conventionally ignored, the fracture criteria often fail to accurately predict the edge crack. In the present work, a new ductile fracture criterion (DFC) to predict edge cracking of ultra-high strength steel is proposed by considering the damage accumulation near the blanked edge. A new state variable representing pre-damage accumulation is coupled with the conventional DFC to describe damage accumulation. Based on the tensile test data under different blanking conditions, the parameters of the new DFC are calibrated. To verify the new model, flanging simulations are performed to predict fracture strains at edge and compared with experimental results. The new model has the capability of predicting the edge cracking with high prediction accuracy.

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Acknowledgment

The authors are grateful for the financial support from The Ministry of Science and Technology of China through the National Key Research and Development Project with Grant # 2017YFB0304403.

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Authors and Affiliations

  1. Department of Plasticity Technology, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China

    Daizhou Li, Huiping Wu, Xuepeng Zhan, Zhidong Chang & Jun Chen

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  1. Daizhou Li
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  2. Huiping Wu
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  3. Xuepeng Zhan
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  5. Jun Chen
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Correspondence to Huiping Wu.

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Li, D., Wu, H., Zhan, X. et al. A New Ductile Fracture Model for Edge Cracking Prediction of Ultra-High Strength Steel Considering Damage Accumulation in Blanking Process. J. of Materi Eng and Perform 31, 6880–6890 (2022). https://doi.org/10.1007/s11665-022-06718-3

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  • DOI: https://doi.org/10.1007/s11665-022-06718-3

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