GTN Damage Model Parameters for Ductile Fracture Simulation in Aluminum Alloy 5083-O

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Abstract

Among the various models of ductile fracture, Gurson-Tevergard-Needleman (GTN) damage model has been widely used due to consider three steps; nucleation, growth, and the coalescence of voids during plastic deformation. Important issues in GTN model is the exact calculation of the model parameters which in experimental methods are very time consuming and costly. Therefore, the finite element simulation method is used for this purpose. The porous metals plasticity model in Abaqus software does not consider the coalescence of voids step and analyzes issues on the basis of two steps of nucleation and growth of voids. This causes an error in the results. In this study, the uniaxial tension test of aluminum alloy 5083-O is simulated with GTN damage model. Simulation is carried out by using finite element software Abaqus through writing code in the UMAT subroutine. The GTN damage model parameters of AA5083-O are evaluated by matching experimental engineering stress-strain curve and simulated curve. The results showed that the written code through UMAT subroutine addition to led to improve the simulation of GTN damage model in Abaqus software, provides an acceptable prediction of the GTN model parameters.

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References

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Journal of Solid and Fluid Mechanics
Volume 6, Issue 1
March and April 2016
Pages 129-142

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