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| FDM-DEM耦合方法模拟月壤水冰模拟物的SHPB冲击试验 |
| Simulation of SHPB impact tests on lunar water ice simulants using FDM-DEM coupling method |
| 投稿时间：2023-07-19 修订日期：2023-08-31 |
| DOI： |
| 中文关键词: 月壤水冰模拟物 分离式霍普金森压杆(SHPB)试验 FDM-DEM耦合 动态冲击特性 破坏形态 |
| 英文关键词:Lunar water ice simulant SHPB tests FDM-DEM coupling method impact dynamic properties failure pattern |
| 基金项目:国家自然科学基金项目(项目编号. 52009097, 12172259); 湖北省教育厅科学研究计划项目 (项目编号： B2021080) |
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| 中文摘要: |
| 全球对月球的探索在近几年再次掀起一阵热潮，下一阶段的探月任务主要集中于对月球极地的取样与资源勘探，涉及月球极地水冰混合物的大量动力学问题研究。本文采用有限差分法(FDM)与离散元法(DEM)的耦合方法，开展了月壤水冰模拟物的分离式霍普金森压杆（SHPB）试验模拟，研究了月壤水冰模拟物在冲击载荷下的动力学性能及损伤特性。通过与试验结果对比发现本文提出的FDM-DEM模型能够很好模拟月壤水冰模拟物的SHPB冲击测试。获得了月壤水冰模拟物峰值强度与应变率的关系，发现月壤水冰模拟物表现出应变率增强效应，即应变率越高，峰值应力越大,与砂土的应变率不敏感性存在明显差异。冲击过程中，试样的损伤随着冲击速度的增加而增大，但损伤持续时间减小。损伤裂纹首先出现在试样与压杆的交界处，随着试样的压实，试样内部产生裂纹，最终内外部裂纹相互扩展交汇，直至破坏。研究结果为深入理解月球极地月壤水冰混合物的动力学性能和失效行为提供了重要的参考。 |
| 英文摘要: |
| 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 mixtures. 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 simulant, and the dynamic properties and damage characteristics of lunar water ice simulant under impact load 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, it 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. Eventually, the internal and external cracks of the sample propagate and intersect with each other until failure. The results provide important references for a deeper understanding of the dynamic performance and failure behavior of lunar water ice mixtures in the lunar polar regions. |
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