AHSS Shear Fracture Predictions Based on a Recently Developed Fracture Criterion

Event
SAE 2010 World Congress & Exhibition
Authors Abstract
Content
One of the issues in stamping of advanced high strength steels (AHSS) is the stretch bending fracture on a sharp radius (commonly referred to as shear fracture). Shear fracture typically occurs at a strain level below the conventional forming limit curve (FLC). Therefore it is difficult to predict in computer simulations using the FLC as the failure criterion. A modified Mohr-Coulomb (M-C) fracture criterion has been developed to predict shear fracture. The model parameters for several AHSS have been calibrated using various tests including the butter-fly shaped shear test. In this paper, validation simulations are conducted using the modified (M-C) fracture criterion for a dual phase (DP) 780 steel to predict fracture in the stretch forming simulator (SFS) test and the bending under tension (BUT) test. Various deformation fracture modes are analyzed, and the range of usability of the criterion is identified. Good correlations have been found for failure prediction for tight radius stretch bending.
Meta TagsDetails
DOI
https://doi.org/10.4271/2010-01-0988
Pages
9
Citation
Chen, X., Shi, M., Shih, H., Luo, M. et al., "AHSS Shear Fracture Predictions Based on a Recently Developed Fracture Criterion," Materials and Manufacturing 3(1):723-731, 2010, https://doi.org/10.4271/2010-01-0988.
Additional Details
Publisher
Published
Apr 12, 2010
Product Code
2010-01-0988
Content Type
Journal Article
Language
English