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| Simulation of SHPB impact tests on lunar water ice simulants using FDM-DEM coupling method |
| Received:July 19, 2023 Revised:August 31, 2023 |
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| DOI：10.7511/jslx20230719002 |
| KeyWord:lunar water ice simulants SHPB tests FDM-DEM coupling method impact dynamic properties failure patterns |
| Author | Institution |
| 李云丽 |
武汉工程大学 土木工程与建筑学院 岩土与地下工程系, 武汉 |
| 杨振睿 |
武汉工程大学 土木工程与建筑学院 岩土与地下工程系, 武汉 |
| 吴文平 |
武汉大学 土木工程学院 工程力学系, 武汉 |
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| Abstract: |
| In recent years,there has been a resurgence of global interest in exploring the moon.The next phase of lunar exploration missions will mainly focus on sampling and resource exploration in the lunar polar regions,involving a large amount of dynamic research of lunar water ice simulants.In this paper,the coupling method of finite difference method (FDM) and discrete element method (DEM) is used to carry out the split Hopkinson pressure bar (SHPB) test of lunar water ice simulants,and the dynamic properties and damage characteristics of lunar water ice simulants under impact loading are studied.By comparing with the experimental results,it is found that the FDM-DEM model proposed in this paper can effectively simulate the SHPB impact testing of lunar water ice simulants.The relationship between peak strength and strain rate of lunar water ice simulants is obtained.It is found that lunar water ice simulants exhibit a strain rate enhancement effect,where a higher strain rate results in a higher peak stress,which is significantly different from the strain rate insensitivity of sandy soils.During the impact process,the damage of the sample increases with the increase of impact speed,but the duration of the damage decreases.The damage cracks first appear at the interface between the sample and the compression rod.As the sample is compacted,cracks are generated inside the sample,and eventually the internal and external cracks of the sample propagate and intersect with each other until failure occurs.The results provide important references for a deeper understanding of the dynamic performance and failure behavior of lunar water ice simulants in the lunar polar regions. |
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