爆炸载荷下板条边界斜裂纹的动态扩展行为

基金项目:

国家自然科学基金项目(50774086)

Dynamicpropagationbehaviorsofanobliqueedgecrack inmaterialunderblastloading

Funds:

NationalNaturalScienceFoundationofChina(50774086)

摘要: 为了研究爆炸应力波作用下板条边界斜裂纹的动态扩展行为,首先分析了爆炸应力波在含边界斜裂纹板条中的传播,其次采用动态焦散线实验方法,进行了爆炸载荷下板条边界斜裂纹扩展规律的实验研究。研究结果表明,爆炸应力波作用下,板条试件边界斜裂纹的扩展过程中,裂纹扩展速度、扩展加速度和裂尖动态应力强度因子随时间波动变化,扩展速度最大值达到222 m/s,裂纹扩展加速度瞬时到达最大值11.01 Mm/s2,裂尖动态应力强度因子KdⅠ 最大值为0.735 MN/m3/2。斜边裂纹尖端拉应力场是造成裂纹起裂、扩展的主要原因。
- 固体力学 /
- 裂纹扩展 /
- 动态焦散线 /
- 边界斜裂纹 /
- 爆炸应力波
Abstract: Thepropagationofexplosionstresswavesinstripscontaininganobliqueedgecrackwasanalyzed. Andaseriesofcausticexperimentswereconductedtoexplorethecrackextensionunderblast loading.Investigatedresultsshowthatthecrackgrowthvelocity,accelerationanddynamicstressintensityfactorsfluctuateduringthepropagationoftheobliqueedgecrackunderexplosionstress waves.Themaximumvaluesofthecrackgrowthvelocity,accelerationanddynamicstressintensity factorKdⅠ atthecracktipare222m/s,11.01MN/s2and0.735MN/m3/2,respectively.Thetensile fieldatthetipoftheobliqueedgecrackisamainfactortoinducecrackinitiationandpropagation.
- solid mechanics /
- crackpropagation /
- dynamiccaustics /
- obliqueedgecrack /
- explosion stresswave