| 岳中文*,杨仁树.爆炸载荷下裂纹扩展方向预测的研究[J].实验力学,2010,25(4):408~414 |
| 爆炸载荷下裂纹扩展方向预测的研究 |
| Study of Crack Propagation Direction Prediction under Explosion Loading |
| 修订日期：2010-05-09 |
| DOI： |
| 中文关键词: 动态焦散线 动态裂纹 Det.(σij)准则 方向预测 |
| 英文关键词:dynamic caustics dynamic crack Det.(σij) criterion direction prediction |
| 基金项目:国家863计划高科技研究目标导向项目(2007AA06Z131)；中央高校基本科研业务费资助 |
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| 中文摘要: |
| 借助动态焦散线方法测试结果，对裂纹尖端初始曲线范围内的第二应力张量不变量分布进行了分析，并通过Det.(σij)准则对爆炸载荷下裂纹扩展的方向及临界条件进行预测。结果表明，爆炸应力波作用下，裂纹尖端初始曲线范围内第二应力张量不变量最大值与裂纹尖端动态应力强度因子有相同的变化规律，完全可以反映裂纹尖端的动态行为。Det.(σij)准则用于分析爆炸应力波作用下缺陷介质裂纹扩展行为是十分有效的，特别是对于裂纹起始扩展方向及扩展临界条件有准确的描述。 |
| 英文摘要: |
| Second stress tensor invariant distribution at the crack tips around the initial curve was studied based on the results of dynamic caustics, and crack growth direction and critical condition of crack initiation under explosion loading were predicted by Det.(σij)-Criterion. Results show that under explosion stress wave, the maximum value of second stress tensor invariant within initial curve at crack tips and dynamic stress intensity factor at crack tips have the same variation trend, so it can completely reflect the dynamic behavior of crack tips. Det.(σij)-Criterion is very effective to analyze the behavior of crack propagation in material containing flaw under explosion stress wave loading, especially is accurate to describe the crack initiation direction and the critical condition of crack growth. |
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