ON COLLISIONAL DISRUPTION - EXPERIMENTAL RESULTS AND SCALING LAWS
ON COLLISIONAL DISRUPTION - EXPERIMENTAL RESULTS AND SCALING LAWS
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DOI：
10.1016/0019-1035(90)90012-x
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发表时间：
1990-01-01
期刊：
影响因子：
3.2
通讯作者：
RYAN, EV
中科院分区：
文献类型：
--
作者：
DAVIS, DR;RYAN, EV
我们展示了一个实验程序的结果，该实验程序旨在测量水泥砂浆目标碰撞破碎所产生的冲击强度、碎片尺寸和碎片速度，这些目标的抗碎强度相差一个数量级。均质和非均质目标以及各种弹丸类型在 116 次射击中使用，覆盖速度范围为 50 至 5700 m/s。研究发现，强均质迫击炮目标和弱均质迫击炮目标的冲击强度几乎相同，这与它们的静态强度预期相反。然而，将我们的数据与其他已发表的结果相结合表明，对于从玄武岩到冰等大多数材料，动态冲击强度与准静态材料强度相关。有两种不遵循这一趋势的材料是该计划中使用的弱砂浆以及 A. Fujiwara 和 N. Asada 使用的粘土靶材 (1983, Icarus 56, 590–602)。基于冲击能量、材料特性和碰撞应变率的简单缩放算法被证明可以预测与最大碰撞碎片尺寸的实验结果一致的值。我们提供了 30 次碰撞实验的碎片速度数据，并且与沙子中的陨石坑撞击相比，我们发现灾难性碰撞产生的质量速度分布的指数更浅。
We present results from an experimental program designed to measure impact strengths, fragment sizes, and fragment velocities resulting from the collisional shattering of cement mortar targets having crushing strengths which vary by an order of magnitude. Both homogeneous and nonhomogeneous targets, together with a variety of projectile types, are used in 116 shots covering a velocity range from 50 to 5700 m/sec. The impact strengths of strong and weak homogeneous mortar targets are found to be nearly identical, contrary to what would be expected from their static strengths. However, combining our data with other published results shows that the dynamic impact strength is correlated with quasi-static material strengths for most materials ranging from basalt to ice. Two materials that do not follow this trend are the weak mortar used in this program and the clay targets used by A. Fujiwara and N. Asada (1983, Icarus 56, 590–602). A simple scaling algorithm based on impact energy, material properties, and collisional strain rate is shown to predict values which are consistent with experimental results for the size of the largest collisional fragment. Data on fragment velocities are given for 30 of our collisional experiments, and we find a shallower exponent for the mass-velocity distribution resulting from catastrophic collisions as compared with cratering impacts into sand.