Effects of the stress state on plasticity and ductile failure of an aluminum 5083 alloy |
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| Authors: | Xiaosheng Gao Tingting Zhang Matthew Hayden Charles Roe |
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| Institution: | aDepartment of Mechanical Engineering, The University of Akron, 302 Buchtel Common, Akron, OH 44325, USA;bAlloy Development and Mechanics Branch, Naval Surface Warfare Center, West Bethesda, MD 20817, USA |
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| Abstract: | The experimental and numerical work presented in this paper reveals that stress state has strong effects on both the plastic response and the ductile fracture behavior of an aluminum 5083 alloy. As a result, the hydrostatic stress and the third invariant of the stress deviator (which is related to the Lode angle) need to be incorporated in the material modeling. These findings challenge the classical J2 plasticity theory and provide a blueprint for the establishment of the stress state dependent plasticity and ductile fracture models for aluminum structural reliability assessments. Further investigations are planned to advance, calibrate and validate the new plasticity and ductile fracture models. |
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| Keywords: | Hydrostatic stress Lode angle Third invariant J3 Plasticity Ductile failure |
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