Micromechanical Damage Model for Plasticity of ‎Metals to Predict Failure under Shear Loads

Document Type : Research Article

Authors

1 Amirkanir University of Technology, Mechanical Engineering Department, Tehran, Iran

2 Imperial College-مهندسی مکانیک

Abstract

The present work deals with the Gurson-Tvergaard-Needleman micromechanics based damage model to add ‎the ability to predict damage under shear loads and use it in modeling damage and failure under shear dominated ‎loading conditions. In the development of the Gurson-Tvergaard-Needleman model, since different damages have ‎different physical concepts and attenuation effects, so an independent shear damage parameter was presented as a ‎function of an equivalent plastic strain of the matrix. The modified Gurson-Tvergaard-Needleman damage model ‎was implemented by developing a code in the Abaqus software. To use the modified Gurson-Tvergaard-‎Needleman model, 16 input parameters of the model were determined for the material under study. After ‎modifying the model, developing the code, and determining the input parameters, it was first tested on a single ‎element. The results of the developed model showed complete agreement with the results of the basic Gurson-‎Tvergaard-Needleman model and analytical solutions under tensile and shear loads, respectively. Finally, the ‎developed model was tested in shear loading on the shear specimen. It was observed that the modified model ‎eliminates the weakness of the base Gurson-Tvergaard-Needleman model and well predicts the occurrence of ‎damage and weakening of the mechanical properties of the material under the prevailing shear conditions.‎

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 12
March 2022
Pages 5679-5702

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