利用TWSRC试件进行砂岩与PMMA脆性材料裂纹断裂特性研究

doi:10.13722/j.cnki.jrme.2018.1305

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Abstract The fracture parameters such as crack initiation time，crack propagation velocity and dynamic crack initiation toughness of different brittle materials will be different under impact loads. In this paper，the crack propagation characteristics of four types of common brittle materials including green sandstone，red sandstone，black sandstone and PMMA(polymethyl methacrylate) were investigated under dynamic loading.. The crack propagation velocity and crack initiation time were measured by utilizing TWSRC(tunnel with single radial crack) samples and crack propagation gauges(CPG)，and the initiation fracture toughness was calculated by experimental-numerical approach. The failure behaviors of the TWSRC samples were analyzed by the finite difference code AUTODYN. Through comparisons between the test results and the numerical results，some significant conclusions were obtained as follows. The crack propagation velocity increases with increasing the elastic modulus of the brittle materials and，conversely，the crack initiation time decreases. The dynamic crack initiation toughness of brittle materials increases with increasing the elastic modulus of the brittle materials. Under the same impact loading，the failure behaviors of three types of rock materials are greatly different from those of PMMA.

Key words： rock mechanics brittle material TWSRC crack propagation velocity crack initiation time crack initiation toughness

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	Articles by authors
	ZHOU Lei
	ZHU Zheming
	DONG Yuqing
	FAN Yong
	DENG Shuai
	ZHOU Changlin

Cite this article:

ZHOU Lei,ZHU Zheming,DONG Yuqing, et al. Study on crack fracture characteristics of sandstone and PMMA brittle materials by utilizing TWSRC samples[J]. , 2019, 38(5): 888-899.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.1305 OR http://www.rockmech.org/EN/Y2019/V38/I5/888

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