Measurements of target compressive and tensile strength for application to impact cratering on ice‐silicate mixtures
Measurements of target compressive and tensile strength for application to impact cratering on ice‐silicate mixtures
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DOI：
10.1029/2007je002926
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发表时间：
2008-02
影响因子：
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通讯作者：
K. Hiraoka;M. Arakawa;M. Setoh;A. Nakamura
中科院分区：
文献类型：
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作者：
K. Hiraoka;M. Arakawa;M. Setoh;A. Nakamura
[1]太阳系外的小型冰体已经被证明是由冰和硅酸盐的混合物组成的。之前对冰-硅酸盐混合物靶进行的撞击坑实验结果表明，坑体积随着硅酸盐含量的增加而减小。在实验室实验中和具有一定强度的小型天体上，表面强度控制着弹坑的形成。在这项研究中，我们测量的单轴压缩和拉伸强度的目标在以前的冲击弹坑实验中使用的单轴压缩和巴西的测试，分别在263 K和计算的剪切强度从测量值。我们发现单轴抗压和抗拉强度随着硅酸盐含量的增加而增加，这解释了为什么弹坑体积随着硅酸盐含量的增加而减小。由于单轴抗压强度和抗拉强度的增加梯度不同，抗拉强度和单轴抗压强度之间的差异随着硅酸盐含量的增加而变小，直到50wt%。我们发现，火山口层裂直径更好地缩放的拉伸强度，以补偿硅酸盐含量的差异比单轴抗压强度。
[1] Small icy bodies in the outer solar system have been shown to consist of ice-silicate mixtures. The results of previous impact cratering experiments on ice-silicate mixture targets showed that a crater volume decreases with increasing silicate content. Surface strength controls craterings in laboratory experiments and on small bodies with a certain degree of strength. In this study we measured the uniaxial compressive and tensile strength of the targets used in previous impact cratering experiments by uniaxial compression and Brazilian tests, respectively, at 263 K and calculated the shear strength from the measured values. We found the uniaxial compressive and tensile strength increased with silicate content, which explains why the crater volume decreases with increasing silicate content. Since the gradient of increase of the uniaxial compressive and the tensile strength was different, the difference between the tensile strength and the uniaxial compressive strength becomes smaller with the increase of silicate content up to 50 wt %. We show that the crater spall diameter is better scaled by the tensile strength to compensate the difference of the silicate content than by the uniaxial compressive strength.