一种考虑局部颈缩及损伤演化的改进失效准则在铝合金板冲击有限元分析中的应用

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摘要为快速准确分析铝合金结构在不同冲击载荷作用下的损伤断裂行为，提出了一种由局部颈缩准则和损伤演化模型相结合的、参数易于校准且适用于粗网格的改进失效准则。采用Fortran语言将自定义失效准则嵌入到LS-DYNA程序中完成二次开发，实现了改进的失效准则在数值仿真中的应用。通过对比分析九组试验与仿真结果，验证了改进的失效准则的适用性和准确性。研究结果表明：改进的材料失效准则具有较低的网格依赖性，能够很好地预测铝合金板的塑性破坏程度，可为铝合金结构冲击强度分析提供技术支撑。

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	陈楚天1
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	刘斌1
	张晓丹3
	吴卫国1

关键词 ：铝合金, 失效准则, 二次开发, 冲击强度, 网格敏感性

Abstract：To analyze rapidly and accurately the fracture behavior of aluminum alloy structures under different impact loads, a revised failure criterion is proposed based on the combination of local necking criterion and damage evolution model. The parameters are calibrated easily and suitable for coarse meshes. The user-defined failure criterion is embedded into LS-DYNA program by Fortran language to complete the secondary development, and the application of the revised failure criterion is realized in numerical simulation. The applicability and accuracy of the revised failure criterion are verified by comparing the nine experimental and numerical results. It shows that the material failure criterion revised in this paper has low mesh dependence and can well predict the degree of plastic failure of aluminum alloy plates, which can provide a technical support for the impact strength analysis of aluminum alloy structure.

Key words： aluminum alloy failure criterion secondary development impact strength mesh size sensitivity

收稿日期: 2022-08-09 出版日期: 2023-09-15

引用本文:

陈楚天1,2，刘斌1，张晓丹3，吴卫国1. 一种考虑局部颈缩及损伤演化的改进失效准则在铝合金板冲击有限元分析中的应用[J]. 振动与冲击, 2023, 42(17): 120-127.
CHEN Chutian1,2, LIU Bin1, ZHANG Xiaodan3, WU Weiguo1. Application of an improved failure criterion considering local necking and damage evolution in finite element analysis of aluminum alloy plate impact. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(17): 120-127.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I17/120

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