Catastrophic disruption by hypervelocity impact of multi-layered spherical ice targets
Catastrophic disruption by hypervelocity impact of multi-layered spherical ice targets
复制标题
多层球形冰目标的超高速撞击造成灾难性破坏
DOI：
10.1016/j.ijimpeng.2022.104294
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发表时间：
2022
影响因子：
5.1
通讯作者：
Burchell M
中科院分区：
文献类型：
--
作者：
Burchell M
报道了三层球形冰体的灾难性破裂。这些天体的总直径为19厘米，有一个中央核心、一个中间水层和一个冰面（每层分别约占总半径的25%、55%和20%）。它们对高速撞击的反应是在实验室尺度上进行研究的，方法是以0.9 - 3.2 km s-1的速度向目标发射直径为1.5 mm的玻璃球，冰层厚度标准化为弹丸直径通常为20 - 30。这样一个物体（定义为撞击后最大碎片的质量是原始目标质量的1/2）的能量密度为（3.1±0.1）J kg−1。这一数值明显低于类似大小的实心冰球（18 ± 0.7）J kg−1、充水冰球（16.25 ± 1.35）J kg− 1或空心冰球（25.5 ± 0.5）J kg− 1，表明内部海洋下方的固体层可以影响破坏，有效地削弱了身体。
The catastrophic disruption of tri-layered spherical icy bodies is reported. The bodies are 19 cm in total diameter, with a central core, an intermediate water layer and an icy surface (each layer respectively approximately 25, 55 and 20% of the total radius). Their response to high-speed impact is investigated at laboratory scales by firing 1.5 mm diameter glass spheres at the targets at speeds in the range 0.9 – 3.2 km s−1and an ice layer thickness normalised to projectile diameter of typically 20 – 30. The energy density to just break apart such a body (defined as an event where the mass of the largest fragment post-impact is ½ the original target mass) is (3.1±0.1) J kg−1. This is significantly less than that found for similar sized solid ice spheres (18 ± 0.7) J kg−1, water filled ice spheres (16.25 ± 1.35) J kg−1or hollow ice spheres (25.5 ± 0.5) J kg−1indicating that the presence of a solid layer beneath an internal ocean, can influence disruption, effectively weakening the body.