Impact experiments of porous gypsum glass bead mixtures simulating parent bodies of ordinary chondrites: Implications for re-accumulation processes related to rubble-pile formation,
Impact experiments of porous gypsum glass bead mixtures simulating parent bodies of ordinary chondrites: Implications for re-accumulation processes related to rubble-pile formation,
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模拟普通球粒陨石母体的多孔石膏玻璃珠混合物的冲击实验：对与碎石堆形成相关的再堆积过程的影响，
DOI：
10.1016/j.icarus.2011.05.012
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发表时间：
2011
期刊：
影响因子：
3.2
通讯作者：
M.
中科院分区：
文献类型：
--
作者：
Yasui;M.;Arakawa;M.
对石膏-玻璃微珠靶模拟普通花岗岩的母体进行了实验室冲击实验。实验研究了母体中球粒对撞击破裂的影响，以确定灾难性破裂后形成碎石堆体的撞击条件。靶包括直径从100μm到3 mm的玻璃珠，体积分数为0.6，与普通的石墨球相似，约为0.65-0.75。用单级气炮和二级轻气炮分别以60- 180 ms-1和4km-1的速度撞击直径为10 mm和2 mm的尼龙弹丸。石膏-玻璃珠靶的冲击强度范围为56至116 Jkg − 1，取决于玻璃珠的大小，并且比多孔石膏靶的冲击强度小几倍，在低速碰撞中为446 Jkg − 1。100μm珠靶和多孔石膏靶的冲击强度强烈地依赖于冲击速度：在高速碰撞中获得的冲击强度是在低速碰撞中获得的冲击强度的几倍。在质心系统中测量的从目标撞击表面两个角喷射的碎片速度略微取决于目标材料，而与撞击速度无关。这些结果表明，含球粒的星子（CiPs）可以重建碎石堆机构在灾难性的破坏在星子的大小小于没有球粒的星子。
Laboratory impact experiments were conducted for gypsum–glass bead targets simulating the parent bodies of ordinary chondrites. The effects of the chondrules included in the parent bodies on impact disruption were experimentally investigated in order to determine the impact conditions for the formation of rubble-pile bodies after catastrophic disruption. The targets included glass beads with a diameter ranging from 100μm to 3mm and the volume fraction was 0.6, similar to that of ordinary chondrites, which is about 0.65–0.75. Nylon projectiles with diameters of 10mm and 2mm were impacted at 60–180ms−1by a single-stage gas gun and at 4kms−1by a two-stage light gas gun, respectively. The impact strength of the gypsum–glass bead target was found to range from 56 to 116Jkg−1depending on the glass bead size, and was several times smaller than that of the porous gypsum target, 446Jkg−1in low-velocity collisions. The impact strengths of the 100μm bead target and the porous gypsum target strongly depended on the impact velocity: those obtained in high-velocity collisions were several times greater than those obtained in low-velocity collisions. The velocities of fragments ejected from two corners on the impact surface of the target, measured in the center of the mass system, were slightly dependent on the target materials, irrespective of impact velocity. These results suggest that chondrule-including planetesimals (CiPs) can reconstruct rubble-pile bodies in catastrophic disruptions at the size of the planetesimal smaller than that of planetesimals without chondrules.