| 7 | PREDICTION OF PATH-DEPENDENT FAILURE IN ALUMINUM SHEET METALS UNDER FORMING OPERATIONS显示文摘An approximate macroscopic yield criterion for anisotropic porous sheet metals is adopted in a failure prediction methodology that can be used to investigate the failure of sheet metals under forming operations. This failure prediction methodology is developed based on the Marciniak-Kuczynski approach by assuming a slightly higher void volume fraction inside randomly oriented imperfecte analysis. Here, a nonproportional deformation history including relative rotation of principal stretch directions is identified in a selected critical element of an aluminum sheet from a FEM fender forming simulation. Based on the failure prediction methodology, the failure of the critical sheet element is investigated under the non-proportional deformation history. The results show that thiven non-proportional deformation history. | H.-M. Huang, J. Pan and S. C. Tang 1) Mechanical Engineering and Applied Mechanics, The University of Michigan Ann Arbor, MI 48109, USA 2) Ford Research Laboratory, Ford Motor Company Dearborn, MI 48121, USA | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，2： | 0 |
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