爆炸载荷作用下相向裂纹扩展行为的实验研究

发布时间：2018-05-03 16:15

本文选题：爆炸载荷 + 相向裂纹　；参考：《煤炭学报》2017年05期

【摘要】：采用数字激光动态焦散线实验系统,研究爆炸载荷作用下两相向扩展裂纹的动态特征及其相互作用关系。结果表明:相向运动裂纹的扩展过程分为3个阶段:独立扩展、相互排斥、相互吸引,最终形成彼此勾连的形态,在实验范围内不受两裂纹初始竖向距离的影响而改变;裂纹在扩展过程中发生相互作用时其扩展速度发生突跃,此时两裂纹尖端的水平距离随裂纹初始竖向间距的增大而减小;随着两裂纹初始竖向间距的改变,两裂纹开始相互作用时其裂尖距都在56~70 mm之间;两裂纹竖向偏移距离最大位置对应于裂纹尖端水平距离为0的时刻,两相向运动裂纹初始间距越大,裂尖在竖向方向的偏移距离越小。
[Abstract]:The dynamic characteristics and interaction relationship of two phase propagating cracks under explosive loading are studied by using a digital laser dynamic caustic line experimental system. The results show that the propagating process of the opposite moving crack can be divided into three stages: independent propagation, mutual repulsion, mutual attraction, finally forming the form of mutual connection, which is not affected by the initial vertical distance of the two cracks in the experimental range. When the crack interacts in the propagation process, the propagation velocity of the crack jumps, and the horizontal distance of the two crack tip decreases with the increase of the initial vertical distance of the crack, and with the change of the initial vertical distance between the two cracks, When two cracks begin to interact, the crack tip distance is between 5670 mm and the maximum vertical deviation distance corresponds to the moment when the horizontal distance of the crack tip is 0, the larger the initial distance of the two phase moving cracks is. The deviation distance of crack tip in vertical direction is smaller.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;深部岩土力学与地下工程国家重点实验室;
【基金】：国家重点基础研究发展计划资助项目(2016YFC0600903) 高等学校学科创新引智计划资助项目(B14006)
【分类号】：TD235.1

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