The physics of protoplanetesimal dust agglomerates.: I.: Mechanical properties and relations to primitive bodies in the solar system
The physics of protoplanetesimal dust agglomerates.: I.: Mechanical properties and relations to primitive bodies in the solar system
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DOI：
10.1086/508017
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发表时间：
2006-12-01
影响因子：
4.9
通讯作者：
Trigo-Rodriguez, Josep M.
中科院分区：
文献类型：
--
作者：
Blum, Juergen;Schraepler, Rainer;Trigo-Rodriguez, Josep M.
我们介绍了关于宏观尘埃聚集体形成的实验室实验。这些厘米大小的高度多孔的物体是由单个微米大小的尘埃颗粒随机弹道沉积而成的。我们发现，未压缩样品的堆积密度在0.07到0.15之间，这取决于组成尘埃颗粒的形状和尺寸分布。通过单轴压缩实验模拟了对这些物体的撞击。我们发现，最大压缩，相当于类似于50ms(-1)的最高原行星撞击速度，使堆积密度增加到0.20-0.33。用我们的实验室样品进行抗拉强度测量，对于轻微压缩的样品，其产出值在200-1100帕的范围内。我们回顾了原始太阳系天体的堆积密度和拉伸强度，例如彗星、原始陨石和流星体。我们发现我们实验室样品的堆积密度和拉伸强度与来自彗星的样品一致。
We present laboratory experiments on the formation of macroscopic dust aggregates. The centimeter-sized highly porous bodies are produced by random ballistic deposition from individual micrometer-sized dust particles. We find packing densities between 0.07 and 0.15 for uncompressed samples, dependent on the shape and size distribution of the constituent dust grains. Impacts into these bodies are simulated by uniaxial compression experiments. We find that the maximum compression, equivalent to the highest protoplanetary impact velocities of similar to 50ms(-1), increases the packing density to 0.20-0.33. Tensile strength measurements with our laboratory samples yield values in the range 200-1100 Pa for slightly compressed samples. We review packing densities and tensile strengths found for primitive solar system bodies, e. g., for comets, primitive meteorites, and meteoroids. We find a consistency between packing densities and tensile strengths of our laboratory samples with those from cometary origin.