Regolith evolution in the laboratory: Scaling dissimilar comminution experiments
Regolith evolution in the laboratory: Scaling dissimilar comminution experiments
复制标题
实验室风化层演化：扩展不同类型的粉碎实验
DOI：
10.1111/j.1945-5100.1990.tb00968.x
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
F. Hörz
中科院分区：
文献类型：
--
作者：
M. Cintala;F. Hörz
-反复撞击模拟行星表面松散碎片的碎块目标，为行星风暴石的演化提供了经验上的洞察。然而，即使在受控的实验室条件下，影响过程的复杂、多变量性质往往使对这些结果的定量理解和解释变得困难。量纲分析技术已经被用来量化和检验这些实验巨石演化中更重要的变量之间的关系。将这种方法应用于十个实验系列的结果表明，粉碎的目标质量的数量与(A)目标承受的撞击次数，(B)弹丸的直径，(C)组成目标岩石的晶体的平均尺寸，(D)演变的“风化”的平均颗粒尺寸，(E)目标总质量，(F)冲击器密度，和(G)撞击速度与目标岩石中的声速的比率成正比。粉碎的质量与目标岩石的密度和“风化层”的分选成反比。类似的结果也适用于通过压裂来创建新的表面，除了目标所拥有的初始表面积取代了总的目标质量。此外，创建新表面的容易程度与平均晶体尺寸无关。尽管在这两种情况下，冲击器和目标密度之间的比率似乎是一个重要的参数，但还需要更多的实验来确定该参数的定量贡献，以及组成目标岩石的总目标质量和单个矿物的有效强度。
— Repeated impacts into fragmental targets simulating unconsolidated debris on planetary surfaces have provided empirical insight into the evolution of planetary regoliths. Quantitative understanding and interpretation of these results, however, are often made difficult by the complex, multivariate nature of the impact process, even under controlled laboratory conditions. The techniques of dimensional analysis have been employed to quantify and examine the relationships between the more important variables in the evolution of these experimental regoliths. Application of this method to the results of ten experimental series shows that the quantity of comminuted target mass is directly proportional to (a) the number of impacts sustained by the target, (b) the diameter of the projectile, (c) the mean size of the crystals composing the target rock, (d) the mean grain-size of the evolving “regolith,” (e) the total target mass, (f) the impactor density, and (g) the ratio of the impact velocity to the velocity of sound in the target rock. The comminuted mass is inversely proportional to the density of the target rock and the sorting of the “regolith.” Similar results hold for the creation of new surfaces by fracturing, except that the initial surface area possessed by the target takes the place of the total target mass. In addition, the ease with which new surfaces are created is independent of the mean crystal-size. Although it appears that the ratio between impactor and target densities is an important parameter in both cases, more experiments will be necessary to establish the quantitative contribution of that parameter, as well as those of the total target mass and the effective strengths of the individual minerals composing the target rock.