Distinct element method investigation on mechanical behavior within shear bands in granulates under the Earth and the Moon conditions

• Published in: Theoretical and applied mechanics letters Vol. 3; no. 2; pp. 25 - 29
• Main Authors: Jiang, Mingjing, Zhang, Wangcheng
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.2013
• Subjects: distinct element method; lunar regolith; micromechanics; shear band; van der Waals forces; 剪切带; 力学行为; 地球; 旋转速率; 月球; 机械; 离散元方法; 颗粒; distinct element method; lunar regolith; shear band; van der Waals forces; micromechanics
• ISSN: 2095-0349; 2095-0349
• DOI: 10.1063/2.1302105

This letter mainly aims to investigate the mechanical behavior within shear bands in regolith both under the Earth and the Moon conditions via the distinct element method, in which a novel contact model considering interparticle van der Waals forces and rolling resistance is employed. The results show that for regolith under both conditions the stress paths are almost identical inside and outside the shear bands but void ratio, average pure rotation rate, and strain paths are rather distinct with dilation, particle rotation and the second invariant of strain tensor mainly occurring within the bands. However, the regolith under the Moon condition has higher peak strength and more significant strain localization than those under the Earth condition.