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首页> 外文期刊>Journal of aerospace engineering >Discrete Element Modeling of Strength Properties of Johnson Space Center (JSC-1A) Lunar Regolith Simulant
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Discrete Element Modeling of Strength Properties of Johnson Space Center (JSC-1A) Lunar Regolith Simulant

机译：约翰逊航天中心（JSC-1A）月球雷戈利斯模拟物强度特性的离散元建模

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This paper simulates the three-dimensional axisymmetric triaxial compression of JSC-1A lunar regolith simulant under lunar and terrestrial gravity environments under a wide range of confining pressures and relative densities. To accomplish this, the discrete element method (DEM), using Particle Flow Code In Three-Dimensional (PFC3D) software, was employed. The paper focuses on the peak and the critical state (CS) friction angles, which were predicted in the ranges of 35.4°-82.7° and 31.2°-79.8°, respectively, depending on the specimen density and confining pressure. A significant increase in peak and CS friction angles was predicted at near-zero confining pressure. The DEM results validated an empirical model that relates the peak friction angle with the CS friction angle, relative density, and mean effective stress at the CS. Comparison of DEM results with lunar in situ measurements of friction angle, from Apollo missions and other extraterrestrial laboratory experiments under a microgravity environment, shows a favorable agreement.
机译：本文在大范围的围压和相对密度下，模拟了月球和陆地重力环境下JSC-1A月球重塑模拟物的三维轴对称三轴压缩。为此，采用了使用三维颗粒流代码（PFC3D）软件的离散元素方法（DEM）。本文着重讨论了峰值和临界状态（CS）摩擦角，这些摩擦角分别根据样品密度和围压在35.4°-82.7°和31.2°-79.8°范围内预测。预计在接近零的围压下，峰值和CS摩擦角会显着增加。 DEM结果验证了一个经验模型，该模型将峰值摩擦角与CS摩擦角，相对密度和CS处的平均有效应力相关联。将DEM结果与月球原位测量的摩擦角（在阿波罗任务和其他外星实验室实验中在微重力环境下进行的比较）进行了比较，发现了良好的一致性。

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