爆炸应力波作用下动、静裂纹相互作用的实验研究

发布时间：2019-01-02 17:48

【摘要】：采用数字激光动态焦散线测试系统,研究爆炸应力波作用下动裂纹与预制静裂纹(水平夹角为90°、150°)相互作用机理,以及裂纹扩展的动态行为。结果表明:(1)在动、静裂纹贯通之前,静裂纹两端便出现焦散斑,动、静裂纹贯通以后,静裂纹沿爆炸应力波传播方向扩展,并且扩展速度小于动裂纹扩展速度,也小于无静裂纹时动裂纹扩展速度;(2)静裂纹存在时,动裂纹扩展的总体长度减小。动裂纹起裂时间缩短,扩展速度基本不受静裂纹的影响,裂纹应力强度因子值大于静裂纹两端值;(3)随着静裂纹水平夹角的增大,动、静裂纹贯通时动裂纹沿水平方向偏转距离增大,静裂纹B端反向扩展与动裂纹相互"咬合",C端裂纹扩展位移和速度增大。
[Abstract]:The interaction mechanism of dynamic crack and precast static crack (90 掳, 150 掳) under explosive stress wave and the dynamic behavior of crack propagation are studied by using a digital laser dynamic caustic line test system. The results show that: (1) there are scorch speckles at the two ends of the static crack before the dynamic and static crack passes through, and the static crack propagates along the direction of the explosive stress wave, and the propagation speed is smaller than that of the dynamic crack. It is also smaller than the dynamic crack propagation speed without static crack. (2) when the static crack exists, the total length of the dynamic crack propagation decreases. The crack initiation time is shortened and the propagation speed is not affected by the static crack. The stress intensity factor of the crack is larger than that of the two ends of the static crack. (3) with the increase of the horizontal angle of the static crack, the deflection distance of the dynamic crack along the horizontal direction increases when the static crack passes through, the reverse propagation of the static crack and the dynamic crack "bite" each other, and the crack propagation displacement and velocity increase at the C end.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;中国矿业大学(北京)深部岩土力学与地下工程重点实验室;
【基金】：国家重点基础研究发展计划(973计划)项目(2016YFC0600903) 高等学校学科创新引智计划项目(B14006)
【分类号】：O346.1

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