TJ-1模拟月壤颗粒几何特性

颗粒几何特性是颗粒材料的一个重要物理性质,是决定颗粒材料力学性质的一个重要因素.针对软着陆模型试验所用的TJ-1模拟月壤颗粒进行了体视显微镜扫描,获取数字图像后用图形处理软件对各粒径组的颗粒进行了几何特性各指标参数的量化统计,获得了模拟月壤颗粒在延伸度、圆度和凹凸度等的具体数值,为进一步研究TJ-1模拟月壤物理力学性质与颗粒几何特性的关系提供了相关试验数据.试验结果表明:TJ-1模拟月壤颗粒具有棱角、钩角、锯齿等不规则结构,表面相对凹凸,大粒径颗粒具有明显的蜂窝状气孔结构;颗粒形状各异,主要形状有长条状、类三角形和类四边形.最后对TJ-1模拟月壤颗粒和真实月壤颗粒在几何特性方面进行了对比分析.

Geometric Characteristics of TJ-1 Lunar Soil Simulant Particles

The geometric characteristics of particle is an important physical property of granular material， as well as a principal aspect in determining their mechanical properties. The TJ-1 lunar soil simulant particles used in soft landing model tests were scanned and photographed by using a stereo microscope. Then， a digital imaging processing software was used to statistically analyze the geometric characteristics of particles of each grain size group， and aspect ratio， circularity and roundness of particles were obtained to provide the experimental data for further research of the relationship between geometric characteristics of particles and soil physical and mechanical properties. The research results show that the TJ-1 lunar soil simulant particles have irregular structures of corners， cheicers and sawtooth. Consequently， the surface of particles is relatively rough. Big size particles have obvious honeycomb-like pore structure. The shape of particles differs from each other， the main shapes are long striped， quasi-triangle and quasi-quadrangle. Finally， the geometric characteristics of TJ-1 lunar soil simulant particles is compared to the one of real lunar soil particles.