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3D Stress State Dependent Failure Model for Fracture Simulations

Jonny Michael Shelke, Ala Tabiei

Abstract


The state of stress is defined by triaxiality (hydrostatic pressure) and the lode angle parameter (deviatoric stress third invariant). The stress state not only varies with different kinds of loading but also with the location of the stress concentration, geometry of specimen and deformation. The LS-DYNA implementation of a strain-based, stress state dependent failure criterion for a ductile material is investigated through simulations of standard experiments in this paper. A 3D fracture locus in the principal stress space based on the triaxiality and lode angle parameter is implemented in the LS-DYNA damage model. Experimental data reported from the tests on Aluminum alloy 2024-T351 is used for validation through different specimen tests covering combinations of stress states. Apart from simulating the correct mode of fracture, a satisfactory match between experimental and simulation results is achieved. The detailed experiments required to be conducted and the procedure to utilize the fracture model in the LS-DYNA code is presented.

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References


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DOI: https://doi.org/10.37628/jsmfe.v2i1.74

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