Granular mechanics simulations of collisions between chondritic aggregates

Granular mechanics simulations of collisions between chondritic aggregates
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球粒状聚集体之间碰撞的颗粒力学模拟

DOI:
10.1051/0004-6361/202141581
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发表时间:
2021
影响因子:
6.5
通讯作者:
H. Urbassek
H. Urbassek
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
P. Umstätter;H. Urbassek

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语境。尘埃聚集体的碰撞与原行星盘的演化有关。 目标。虽然过去的兴趣集中在由单分散颗粒组成的聚集体上,但在这里我们研究球粒状聚集体的碰撞,其中除了大多数尘埃颗粒之外还嵌入了更大的球粒。 方法。我们使用颗粒力学模拟来研究球粒状聚集体的碰撞。 结果。低速碰撞导致融合团簇发生薄饼状变形,并伴随着尘埃颗粒的压实。较高的碰撞速度会使聚集体破碎。虽然一些球粒在碰撞后几乎裸露,但我们发现最大的碎片通常包含球粒;大碎片因此捕获球粒。颗粒压实伴随着颗粒与球粒接触的增加,并且在聚集体开始破碎之前达到中间速度的最大值。 结论。球粒的存在极大地影响了尘埃聚集体的破碎行为。
Context. Collisions of dust aggregates are relevant for the evolution of protoplanetary disks. Aims. While in the past interest focused on aggregates composed of monodisperse grains, here we study the collision of chondritic aggregates, in which – besides a majority of dust grains – larger chondrules are embedded. Methods. We use granular-mechanics simulations to study collisions of chondritic aggregates. Results. Low-velocity collisions lead to pancake-shaped deformations of the fused cluster accompanied by a compaction of the dust grains. Higher collision velocities fragment the aggregates. While some chondrules are almost laid bare after the collision, we find that the largest fragments typically contain chondrules; large fragments thus capture chondrules. Grain compaction is accompanied by an increase in grain – chondrule contacts and is maximum for intermediate velocities, just before aggregates start fragmenting. Conclusions. The presence of chondrules considerably influences the fragmentation behavior of dust aggregates.
DOI: --
发表时间: 2009
期刊:
影响因子: --
作者:
D. Paszun;C. Dominik
通讯作者: C. Dominik
DOI: 10.1006/icar.1999.6234
发表时间: 2000-01-01
期刊: ICARUS
影响因子: 3.2
作者:
Blum, J;Wurm, G
通讯作者: Wurm, G
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DOI: 10.3847/1538-4357/aa8564
发表时间: 2017
期刊: The Astrophysical Journal
影响因子: --
作者:
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