Research on Shear Fracture Criterion of Advanced High Strength Dual Phase Steels

Research Area: Volume 9,Issue 5, Sept. 2020 Year: 2020
Type of Publication: Article Keywords: Advanced High Strength Dual-Phase Steels, Shear Experiments, Stress Triaxiality, Tensile-bending Forming, Numerical Simulation
Authors:
  • Qiutao Fu
  • Di Li
  • Mengdi Li
  • Kaidi Wang
Journal: IJEIR Volume: 9
Number: 5 Pages: 186-193
Month: September
ISSN: 2277-5668
Abstract:
The universal ductile fracture criterion (such as the forming limit diagram (FLD)) cannot accurate predict the fracture of advanced high-strength dual-phase steels due to its unique shear fracture phenomenon. Based on the modified Mohr-Coulomb (MMC), this paper designs a series of high-strength Dual-Phase Steel (DP780) shear experiments, obtain the load-displacement curve and the stress triaxiality of the shear specimens at different angles, and the shear fracture strain-stress triaxiality curve is fitted to establish the shear fracture criterion, the curve model of shear fracture strain-stress triaxiality was further verified by the comparison between the tensile-bending test and the tensile-bending numerical simulation.

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