中国物理B ›› 2023, Vol. 32 ›› Issue (3): 34501-034501.doi: 10.1088/1674-1056/aca5ff

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Resistance law of a rod penetrating a multilayer granular raft

Zonglin Li(李宗霖), Qiang Tian(田强), and Haiyan Hu(胡海岩)   

  1. MOE Key Laboratory of Dynamics and Control of Flight Vehicle, School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
  • 收稿日期:2022-08-16 修回日期:2022-10-28 接受日期:2022-11-25 出版日期:2023-02-14 发布日期:2023-02-14
  • 通讯作者: Qiang Tian E-mail:tianqiang_hust@aliyun.com
  • 基金资助:
    Project supported in part by the National Natural Science Foundation of China (Grant Nos. 12125201 and 11832005).

Resistance law of a rod penetrating a multilayer granular raft

Zonglin Li(李宗霖), Qiang Tian(田强), and Haiyan Hu(胡海岩)   

  1. MOE Key Laboratory of Dynamics and Control of Flight Vehicle, School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
  • Received:2022-08-16 Revised:2022-10-28 Accepted:2022-11-25 Online:2023-02-14 Published:2023-02-14
  • Contact: Qiang Tian E-mail:tianqiang_hust@aliyun.com
  • Supported by:
    Project supported in part by the National Natural Science Foundation of China (Grant Nos. 12125201 and 11832005).

摘要: This paper presents an experimental study on the resistance law of a rod vertically penetrating different kinds of multilayer granular rafts with a constant velocity so as to reveal the mechanical properties of the multilayer granular rafts. The resistance was quasi-static under the chosen velocity. Experiments were conducted with different granular thicknesses, rod diameters and combinations of particles and liquids. The study shows that the resistance-displacement relation of the rod has three smooth stages. In the first stage, the resistance rapidly increased. In the second stage, the resistance curve maintained an almost constant slope. In the third stage, the resistance smoothly changed with its slope continuously increasing. Based on the corresponding physical models for each stage, the study reveals the exponential dependence of the load-bearing capacity of the multilayer granular raft on its thickness, and clarifies the capillary effects on the resistance law. The study extends the knowledge of the granular raft from monolayer to multilayer structure.

关键词: granular matter, wet particles, saturated particles, capillary effects

Abstract: This paper presents an experimental study on the resistance law of a rod vertically penetrating different kinds of multilayer granular rafts with a constant velocity so as to reveal the mechanical properties of the multilayer granular rafts. The resistance was quasi-static under the chosen velocity. Experiments were conducted with different granular thicknesses, rod diameters and combinations of particles and liquids. The study shows that the resistance-displacement relation of the rod has three smooth stages. In the first stage, the resistance rapidly increased. In the second stage, the resistance curve maintained an almost constant slope. In the third stage, the resistance smoothly changed with its slope continuously increasing. Based on the corresponding physical models for each stage, the study reveals the exponential dependence of the load-bearing capacity of the multilayer granular raft on its thickness, and clarifies the capillary effects on the resistance law. The study extends the knowledge of the granular raft from monolayer to multilayer structure.

Key words: granular matter, wet particles, saturated particles, capillary effects

中图分类号:  (Granular systems)

  • 45.70.-n
47.55.nb (Capillary and thermocapillary flows) 89.75.-k (Complex systems)