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Meeting Materials Science & Technology 2019
Symposium Formability and Fracture of Metal Sheets
Presentation Title A Method to Predict the Ductile Fracture of Metal Sheets under Complex Plane Stress
Author(s) Jian Fang, Jian-wei Zhang
On-Site Speaker (Planned) Jian Fang
Abstract Scope Advanced high strength steels and some lightweight alloy sheets (Al, Mg) have been widely used in the automotive industry to manufacture the car body or functional components, satisfying the demands on reduced weight design. Under the extreme service condition like crash for passenger car, the functional structural components made from the above metal sheets usually undergo the complex plane stress, including shear, tension and bulge etc. The material resistance to ductile fracture contributed by its ultimate plastic deformation could not be simply estimated by the conventional stress-strain relationship from uniaxial tensile tests. In the present work, a method to analytically determine the Mohr-Coulomb fracture criterion for sheets, confined by the von-Mises yielding model was introduced. Thereafter the equivalent fracture strain of the sheets under all relative plane-stress states (triaxility) can be predicted, through DIC equipped tensile test upon two specimens, one shear and one tension another.
Proceedings Inclusion? Definite: At-meeting proceedings


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