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| Numerical analysis of particle impact under different gravity conditions by discrete element method |
| Received:March 15, 2022 Revised:June 19, 2022 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20220315002 |
| KeyWord:discrete element method granular materials Impact process gravitational accelerations penetration depth |
| Author | Institution |
| 于杰 |
太原理工大学 机械与运载工程学院, 太原 |
| 罗枭 |
太原理工大学 土木工程学院, 太原 |
| 赵婷婷 |
太原理工大学 机械与运载工程学院, 太原 |
| 张祺 |
太原理工大学 机械与运载工程学院, 太原 ;中国科学院 物理研究所, 北京 |
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| Abstract: |
| The study of the impact dynamics of granular materials in different gravity environments contributes to the understanding of particle motion mechanisms and the implementation of deep space exploration missions.In this paper,the discrete element method (DEM) is used to simulate the dynamic behaviors of granular materials subjected to spherical impactors,which is verified by the experimental results under Earth gravity.Then the effect of gravitational accelerations on dynamic properties of the impactor is further investigated.The DEM results show that the relationship between penetration depth d and impact velocity v0 can be expressed by the Poncelet model at all gravitational accelerations;d and total drop distances H exhibit a power law relationship of d~ Hn,where n is 0.32 when the total fall distance H is less than 10 m,While n drops to 0.211 when H is greater than 10 m.In addition,the acceleration of gravity has no effect on the deceleration process of the impactor when the penetration depth is smaller than the radius of the impactor.At all gravitational accelerations,the collision duration of the impactor is constant and proportional to the -1/2 power of gravity when the impact velocity is greater than 5 m/s. |
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