Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load

被引:0
|
作者
Ge, Yongxiang [1 ,2 ]
Ren, Gaofeng [1 ,2 ]
Zhang, Congrui [1 ,2 ]
Shi, Yihu [1 ,2 ]
Zhang, Luwei [1 ,2 ]
机构
[1] Wuhan Univ Technol, Sch Resources & Environm Engn, Wuhan 430070, Peoples R China
[2] Key Lab Mineral Resources Proc & Environm Hubei Pr, Wuhan 430070, Peoples R China
基金
中国国家自然科学基金;
关键词
rock dynamics; split Hopkinson pressure bar; strain rate effect; finite element simulation; failure modes; SANDSTONE; FRACTURE; SIZE;
D O I
10.3390/ma16103711
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The objective of this work was to investigate the damage characteristics and failure modes of gypsum rock under dynamic impact loading. Split Hopkinson pressure bar (SHPB) tests were performed under different strain rates. The strain rate effects on the dynamic peak strength, dynamic elastic modulus, energy density, and crushing size of gypsum rock were analyzed. A numerical model of the SHPB was established using the finite element software, ANSYS 19.0, and its reliability was verified by comparing it to laboratory test results. The results showed that the dynamic peak strength and energy consumption density of gypsum rock increased exponentially with strain rate, and the crushing size decreased exponentially with the strain rate, both findings exhibited an obvious correlation. The dynamic elastic modulus was larger than the static elastic modulus, but did not show a significant correlation. Gypsum rock fracture can be divided into crack compaction, crack initiation, crack propagation, and breaking stages, and is dominated by splitting failure. With increasing strain rate, the interaction between cracks is noticeable, and the failure mode changes from splitting to crushing failure. These results provide theoretical support for improvements of the refinement process in gypsum mines.
引用
收藏
页数:17
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