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Development of a Modified Gurson–Tvergaard–Needleman Damage Model Characterizing the Strain-Rate-Dependent Behavior of 6061-T5 Aluminum Alloy

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Abstract

It is of vital importance to improve the lightweight and crash safety of automobiles to accurately characterize the fracture features of automotive aluminum alloys under complex working conditions. This study starts with mechanical tests of 6061-T5 aluminum alloy under different stress states and strain rates, the results of which show obvious strain rate sensitivity in such a material. Then, the parameters of the Gurson–Tvergaard–Needleman_Johnson–Cook (GTN_JC) damage model are calibrated based on the test data under different stress states. In view of the fact that the GTN model cannot reflect the strain rate effect, the yield stress is introduced into the strain rate term to modify its hardening stage; in addition, the relationships among \({f}_{c}\),\({f}_{F}\) and the strain rate are established to modify its fracture stage. The modified GTN model can accurately predict the plastic and fracture features of 6061-T5 aluminum alloy at different strain rates. Finally, the modified GTN damage model is programmed as a UMAT in LS-DYNA for simulation analysis. The results of the simulation and the test agree with each other very well, proving the superior reliability of the UMAT.

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Acknowledgments

The authors acknowledge, with thanks, the financial support from the Bei**g Natural Science Foundation (No. L201010 and No. L212024) and the National Natural Science Foundation of China (Grant No. 51975041).

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Authors and Affiliations

  1. School of Mechanical, Electronic and Control Engineering, Bei**g Jiaotong University, Bei**g, 100044, People’s Republic of China

    Zhigang Li, Rui Li & Cheng Ji

  2. Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology, Ministry of Education, Bei**g Jiaotong University, Bei**g, 100044, People’s Republic of China

    Zhigang Li

  3. Bei**g Key Laboratory of Civil Aircraft Structures and Composite Materials, COMAC Bei**g Aircraft Technology Research Institute, Bei**g, 102211, People’s Republic of China

    Jianguang Liu

  4. China Aero–Polytechnology Establishment, Bei**g, 100028, People’s Republic of China

    Zhikai He

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  1. Zhigang Li
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Appendix

Appendix

See Tables

Table 7 The simulation matrix of \({f}_{c}\) and \({f}_{F}\)
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7 and

Table 8 The results of simulation matrix
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8.

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Li, Z., Li, R., Ji, C. et al. Development of a Modified Gurson–Tvergaard–Needleman Damage Model Characterizing the Strain-Rate-Dependent Behavior of 6061-T5 Aluminum Alloy. J. of Materi Eng and Perform 31, 7662–7672 (2022). https://doi.org/10.1007/s11665-022-06789-2

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