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Comparative study of ductile fracture prediction of 22MnB5 steel in hot stamping process

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Abstract

Damage growth and ductile fracture prediction is an urgent question for hot stamping operations. Numerous models for ductile fracture prediction in cold forming processes have been extensively developed. There is a real need to compare them to choose the best suitable one for hot stamping applications. In the present study, several ductile fracture criteria under the category of “uncoupled phenomenological criterion” and the “fully coupled damage criterion,” i.e., the continuum damage mechanics (CDM)-based Lemaitre model, were employed to compare their prediction capability on ductile failure prediction. These two categories of criteria were coded into an explicit thermo-mechanical finite element code dedicated to hot stamping simulation. Both hot forming limit and hot tensile tests of 22MnB5 steel were conducted in order to provide suitable data for calibrating these models. Numerical results of the applications of these models to the hot stamping process simulation of an automotive B-pillar were compared with the experimental ones. It is concluded that thermo-mechanical finite element analysis in conjunction with CDM-based Lemaitre model can be used as a reliable tool to predict ductile damage and fracture of 22MnB5 steel in hot stamping process.

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Correspondence to Liang Ying.

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Shi, D., Hu, P. & Ying, L. Comparative study of ductile fracture prediction of 22MnB5 steel in hot stamping process. Int J Adv Manuf Technol 84, 895–906 (2016). https://doi.org/10.1007/s00170-015-7754-2

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  • DOI: https://doi.org/10.1007/s00170-015-7754-2

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