Impact cratering in sand: comparing solid and liquid intruders,Soft Matter

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Impact cratering in sand: comparing solid and liquid intruders
Soft Matter ( IF 2.9 ) Pub Date : 2020-10-30 , DOI: 10.1039/d0sm01579b
Rianne de Jong _{1,

2,

3,

4,

5} , Song-Chuan Zhao _{1,

2,

3,

4,

5} , Diana Garcia-Gonzalez _{1,

2,

3,

4,

5} , Gijs Verduijn _{1,

2,

3,

4,

5} , Devaraj van der Meer _{1,

2,

3,

4,

5}

Affiliation

How does the impact of a deformable droplet on a granular bed differ from that caused by a solid impactor of similar size and density? Here, we experimentally study this question and focus on the effect of intruder deformability on the crater shape. For comparable impact energies, we show that the crater diameter is larger for droplets than for solid intruders but that the impact of the latter results in deeper craters. Interestingly, for initially dense beds of packing fractions larger than 0.58, we find that the resultant excavated crater volume is independent of the intruder deformability, suggesting an impactor-independent dissipation mechanism within the sand for these dense beds.

中文翻译：

沙子中的撞击坑：比较固态和液态入侵者

可变形液滴对颗粒床的影响与大小和密度相近的固体撞击器的影响有何不同？在这里，我们通过实验研究此问题，并将重点放在入侵者可变形性对弹坑形状的影响上。对于可比较的冲击能量，我们显示了液滴的弹坑直径大于固体入侵者的弹坑直径，但后者的影响导致弹坑更深。有趣的是，对于填充分数大于0.58的初始致密床，我们发现所产生的火山口体积与入侵者的可变形性无关，这表明这些致密床在砂土中的冲击器独立耗散机制。

更新日期：2020-11-06

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