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A Mixed-Mode Fracture Criterion for AHSS Cracking Prediction at Large Strain
ISSN: 1946-3979, e-ISSN: 1946-3987
Published April 12, 2011 by SAE International in United States
Citation: Zhu, H. and Zhu, X., "A Mixed-Mode Fracture Criterion for AHSS Cracking Prediction at Large Strain," SAE Int. J. Mater. Manuf. 4(1):10-26, 2011, https://doi.org/10.4271/2011-01-0007.
Predicting AHSS cracking during crash events and forming processes is an enabling technology for AHSS application. Several fracture criteria including MatFEM and Modified Mohr-Coulomb Criterion were developed recently. However, none of them are designed to cover more fracture modes such as bending fracture and tearing fracture with initial damage. A mixed-mode fracture criterion (MMFC) is proposed and developed to capture multiple fracture modes including in-plane shearing fracture, cross-thickness shearing fracture with bending effect and tearing fracture with initial damage. The associated calibration procedure for this criterion is developed. The criterion is implemented in a commercial FEA code and several lab validations are conducted. The results show its promising potential to predict AHSS cracking at large strain conditions.