考虑压痕尺寸效应的岩石矿物摩擦特性研究

doi:10.13722/j.cnki.jrme.2023.0978

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Abstract The difference between the mechanical properties of rock mineral components is a key factor affecting the macroscopic friction behavior. Based on the target test method，the indentation mechanical properties of sandstone minerals are tested under eight normal loads，and the scratch friction properties of these minerals are studied under basically stable normal load. The results show that as the normal load increases，the deformation parameters(hardness and elastic modulus) of hard-phase minerals exhibit a negative indentation size effect，while the indentation size effect of deformation parameters of soft-phase minerals is not obvious，and the comprehensive basic stable normal load for the four minerals is determined as 8 mN. Under the stable normal load，as the scratch length increases，the friction force of quartz and albite in the hard-phase minerals increase rapidly and then remain stable，while the friction force of calcite and chlorite in the soft-phase minerals both increase rapidly and then slowly. Statistical calculations show that the average elastic recovery rates for the four minerals are 13.29%，15.81%，35.91% and 42.28% respectively. Further combined with the analysis of microscopic mechanism，it is found that dislocation creep and dislocation evolution of minerals are the key factors affecting the indentation size effect and scratch stick-slip behavior respectively. The above research results provide reference significance for the study of correlation between macro and micro mechanical behaviors of rocks.

Key words： rock mechanics nanoindentation nano-scratch indentation size effect dislocation stick-slip

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	Articles by authors
	HUANG Man1
	2
	LIU Haijun1
	2
	HONG Chenjie2
	3
	LIU Dan2
	3
	DU Shigui2
	4
	LUO Zhanyou2
	4

Cite this article:

HUANG Man1,2,LIU Haijun1, et al. Study on friction characteristics of rock minerals considering indentation size effect[J]. , 2024, 43(6): 1371-1382.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0978 OR http://rockmech.whrsm.ac.cn/EN/Y2024/V43/I6/1371

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