爆炸荷载下缺陷介质裂纹扩展规律数值分析研究

发布时间：2018-04-12 00:03

  本文选题：动态焦散线 + 内聚力模型　； 参考：《爆破》2017年03期

【摘要】：利用爆炸加载数字激光动态焦散线试验系统,同时借助ABAQUS有限元分析中内聚力模型数值计算方法,研究了爆炸应力波作用下缺陷介质裂纹扩展规律,并将试验结果与数值计算结果进行了对比。研究表明:在爆炸应力波作用下预制缺陷两端产生了两条翼裂纹A、B,扩展长度基本相同,方向垂直于预制缺陷。两条翼裂纹的扩展基本是对称的,只是在尾端发生轻微翘曲;翼裂纹扩展速度先增大至峰值又振荡减小,之后又增大至第二个较小的峰值,然后又减小,这种变化趋势和裂纹尖端应力强度因子KⅠ保持一致;扩展角β为85°时,计算结果较为接近试验,内聚力模型为动态裂纹扩展的研究提供了一种有效的方法。
[Abstract]:In this paper, the crack propagation law of defect medium under the action of explosive stress wave is studied with the help of the numerical calculation method of cohesive force model in ABAQUS finite element analysis, using the digital laser dynamic caustic line test system loaded by explosion.The experimental results are compared with the numerical results.The results show that two wing cracks are produced at both ends of the prefabricated defects under the action of explosive stress wave, the propagation length is basically the same, and the direction is perpendicular to the prefabricated defects.The propagation of the two wing cracks is basically symmetrical, but only slightly warped at the end of the wing. The propagation velocity of the wing crack increases to the peak value and then decreases, then increases to the second smaller peak value, and then decreases.This variation trend is consistent with the stress intensity factor K 鈪，

本文编号：1738244