SHPB tests and analysis of lunar soil simulant under different negative temperatures and water contents
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摘要: 为了解月球永久阴影区月壤的动态力学性能,以玄武质模拟月壤进行动态冲击试验,研究不同负温、不同含水率及不同应变率加载下模拟月壤的动态应力-应变曲线特性、动态抗压强度和破坏特征,分析动态抗压强度、动弹性模量与模拟月壤负温、含水率、应变率的关系。试验结果表明:动态抗压强度与应变率呈正相关关系;破坏形态类型主要为锥形剪切破坏和颗粒状粉碎破坏;破碎块度分布具有良好的分形特征。研究结果能为未来月球资源研究提供参考。Abstract: In order to study the dynamic mechanical properties of the frozen lunar soil in the permanent shadow area of the moon, the basaltic lunar soil simulant was used as the research object, and the dynamic impact test was performed on it. The dynamic stress-strain curve, dynamic compressive strength and failure of simulated lunar soil under different negative temperature, different moisture content and different strain rate were studied. The relationship between dynamic compressive strength, dynamic elastic modulus and simulated lunar soil temperature, moisture content and strain rate was analyzed. The test results show that the dynamic compressive strength is positively related to the strain rate; the failure modes are mainly conical shear failure and granular crushing failure; the fragmentation distribution has good fractal characteristics. Provide reference for future research on lunar building materials.
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表 1 各种模拟月壤与月壤样品成分对比表
Table 1. Composition of various lunar soil simulant and lunar soil samples
% 样品 SiO2 TiO2 Al2O3 FeO MnO MgO CaO K2O P2O5 Apollo 11[17] 42.20 7.80 13.60 15.30 0.20 7.80 11.90 0.16 0.05 Apollo 14[17] 48.10 1.70 17.40 10.40 0.14 9.40 10.70 0.55 0.51 JSC-1[9] 47.71 1.59 15.02 10.79 0.18 9.01 10.42 0.82 0.66 CAS-1[18] 49.24 1.91 15.08 11.47 0.14 8.72 7.25 1.03 0.30 CUG-1A[19] 48.32 2.38 16.01 12.50 0.15 6.95 7.39 2.12 0.54 试验样品 48.05 1.18 17.08 8.60 0.14 5.58 8.45 1.20 0.61 表 2 模拟月壤颗粒级配
Table 2. Gradation of lunar soil simulant particles
粒径/mm 2.00~5.00 0.50~2.00 0.25~0.50 0.075~0.25 <0.075 含量/% 15 21.5 16 27.5 20 表 3 试验方案
Table 3. Test plan
变量 数值 温度/℃ -5、-10、-15、-20 冲击气压/MPa 0.2、0.3、0.35 含水率/% 5、8、10 -
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