Numerical Modeling of Ductile Fracture

Published on Jan 1, 2013
Jun Zhou1
Estimated H-index: 1
(University of Akron)
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In this contribution, a numerical assessment of three isotropic constitutive models is performed in order to identify their applicability and reliability in the prediction of ductile failure under a wide range of stress triaxiality. The well established isotropic coupled damage models proposed by Gurson–Tvergaard–Needleman (GTN), which is based on micromechanical grounds and here extended with a shear mechanism, and by Lemaitre, which is based on continuum damage mechanics, are selected and inve...
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To predict the deformation and fracture during tube expansion using the finite element (FE) method, a material model is considered that incorporates the damage evolution due to the deformation. In the current study, a Rice-Tracey model was used as the damage model with inclusion of the hydrostatic stress term. Since OFHC Cu is not significantly affected by strain rate, a Hollomon flow stress model was used. The material parameters in each model were obtained by using an optimization method. The ...