快旋小体结构失效分析

IF 2.5 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Icarus Pub Date : 2025-05-23 DOI:10.1016/j.icarus.2025.116662

Qian Pan , Xiangyu Li , Dong Qiao

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引用次数: 0

摘要

小天体在太阳系中广泛存在，其中许多属于快速旋转的小天体。小体的快速旋转将导致垂直于旋转轴的主应力作为拉应力，并且非常快速旋转的下拉应力将主导小体的内部结构，因此DP屈服准则不再适用。本文在考虑拉应力屈服准则的基础上，推导了弹性固体椭球体极限黏聚力计算公式，并将解析结果与有限元数值结果进行对比，验证了公式的正确性。分析了自引力对旋转小体的影响，分析了小体的平面度和体积参数。本文还计算了实际小体（469219）2016 HO3和（29075）1950 DA屈服破坏的极限黏聚力，分析了不同晶粒尺寸小体的结构破坏模式。与之前的（29075）1950 DA分析相比，这项工作提出了拉应力屈服标准下的另一种结果。©2024 xxxxxxxx。由Elsevier B.V.主办，版权所有。

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Analysis of structural failure in fast-spinning small bodies

Small bodies exist widely in the solar system, and plenty of them belong to fast-spinning small bodies. The fast spin of a small body will lead to the principal stress perpendicular to the rotation axis as tensile stress, and the pull-down stress in the very fast spinner will dominate the internal structure of the small body, so the DP yield criterion is no longer applicable. In this paper, considering the yield criterion of tensile stress, the formula of limit cohesion of elastic solid ellipsoid is derived, and the correctness of the formula is verified by comparing the analytical results with the finite element numerical results. The influence of self-gravitation on spinning small bodies is analyzed, and the parameters of the flatness and volume of small bodies are analyzed. This paper also calculates the limit cohesion of yield failure of real small bodies (469219) 2016 HO₃ and (29075) 1950 DA, and analyzes the structural failure modes of small bodies with different grain sizes. Compared to previous analyses of (29075) 1950 DA, this work proposes an alternative result under tensile stress yield criteria.

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来源期刊

Icarus 地学天文-天文与天体物理

CiteScore

6.30

自引率

18.80%

发文量

356

审稿时长

2-4 weeks

期刊介绍： Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.