Summary
A criterion for ductile fracture is introduced in the finite element simulation of sheet metal forming. From the calculated histories of stress and strain in each element, the fracture initiation site and the critical stroke are predicted by means of the ductile fracture criterion. The calculations are carried out for axisymmetric stretch forming of various aluminium alloy sheets and their laminates clad by mild steel sheets. The predictions so obtained are compared with experimental observations. The results show that the combination of the finite element simulation and the ductile fracture criterion enables the prediction of forming limit in a wide range of sheet metals.
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The authors would like to thank the staff at the steel research laboratories of Nippon Steel Corporation for providing the laminated composite sheets.
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Takuda, H., Mori, K., Fujimoto, H. et al. Fracture prediction in stretch forming using finite element simulation combined with ductile fracture criterion. Arch. Appl. Mech. 67, 143–150 (1997). https://doi.org/10.1007/s004190050106
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DOI: https://doi.org/10.1007/s004190050106