基于不同断裂准则的6061-T651铝合金板抗冲击性能数值仿真研究

doi:10.3901/JME.2023.14.138

摘要/Abstract

摘要： 利用ABAQUS/Explicit软件建立了弹体冲击靶板的有限元模型，并采用不同的断裂准则进行数值仿真计算。通过分析铝合金板冲击失效单元的应力状态，揭示不同头部形状弹体冲击下铝合金板的失效机理，以及断裂准则对数值仿真结果的影响规律。研究结果表明，相比MJC断裂准则，WMJC断裂准则由于考虑了Lode角的影响，预测的结果与试验更吻合。随着弹体头部曲率半径比的增大，靶板失效单元中拉伸断裂的占比逐渐增多，从而导致Lode角对数值仿真预测出的弹道极限的影响逐渐减小。此外，在不同头部形状的弹体冲击下，断裂准则对靶板失效模式的影响机制存在区别。

关键词: 数值仿真优化, 弹体头部形状, 失效机理, 断裂准则, 应力状态

Abstract: The finite element models of projectiles impacting target plates have been established using the ABAQUS/Explicit software, and the numerical simulation calculations are carried out by using different fracture criteria. Failure mechanisms of plates under the impact of projectiles with different nose shapes and the influence of fracture criteria on the numerical simulation results are revealed by analyzing the stress state of the failure elements. It is found that the predicted results of WMJC fracture criterion considering the effect of Lode angle are more consistent with the experimental results, compared with the MJC fracture criterion. With the increase of caliber-radius-head of projectile, the proportion of tensile fracture in the failure elements of the target plate gradually increases, which reduces the influence of Lode angle on the ballistic limit predicted by numerical simulation. Moreover, the effect mechanism of fracture criterion on the failure mode is different when the target plate is struck by projectiles with different nose shapes.

Key words: numerical simulation optimization, projectile nose shape, failure mechanism, fracture criterion, stress state

中图分类号:

TG156

邓云飞, 吴华鹏, 杨笑岳, 王轩. 基于不同断裂准则的6061-T651铝合金板抗冲击性能数值仿真研究[J]. 机械工程学报, 2023, 59(14): 138-150.

DENG Yunfei, WU Huapeng, YANG Xiaoyue, WANG Xuan. Numerical Simulation Study on the Ballistic Resistance of 6061-T651 Aluminum Alloy Plates Based on Different Fracture Criterion[J]. Journal of Mechanical Engineering, 2023, 59(14): 138-150.

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