岩石I/II复合断裂韧度测试的单边切槽深梁试件：数值分析与标定

doi:10.13722/j.cnki.jrme.2015.1450

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Abstract A new specimen，namely the single edge notched deep beam(SENDB) specimen，which could test the mixed-mode fracture toughness of rock materials was proposed. The finite element method(FEM) was used to analyze and calibrate the mode I and mode II dimensionless stress intensity factors(i.e. YI and YII) and the dimensionless T-stress(i.e. T*) of the new specimen. Numerical results demonstrated that the SENDB specimen indeed could test the mixed-mode fracture toughness of rocks in a full range of mode mixities from pure mode I to pure mode II by different combinations of the crack inclined angle ，the crack length a and the half distance S between the two bottom supports. The dimensions of the new specimen significantly differed with the ones of the classic single edged notched beam(SENB) specimen，and the mixed-mode loadings can be introduced by an inclined crack in a SENDB specimen while for a SENB specimen mixed-mode loadings are introduced with asymmetry three points bend test(which can not introduce pure mode II loading) or four points bend test(which requires a complex loading fixture). In the aspect of the investigation on scale effect，the SENDB specimen is more suitable than the disc-type specimens，especially for very large size. Compared to the edge crack triangular(ECT) specimen recently proposed by other researchers，the SENDB specimen can conduct mixed-mode fracture tests within a large range of dimensionless crack length and dimensionless span distance. To successfully conduct a pure mode II fracture test，a relative small span distance and a relative long crack are recommended for SENDB，SCB and ECT specimens.

Key words： rock mechanics fracture toughness single edge notched deep beam specimen three-points bend test mixed-mode fracture

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	Articles by authors
	LUO Yi1
	2
	REN Li1
	2
	XIE Lingzhi1
	2
	LI Cunbao1
	2
	WANG Jun1
	2
	GAO Chao2

Cite this article:

LUO Yi1,2,REN Li1, et al. Single edge notched deep beam specimen to test I/II mixed-mode fracture toughness of rocks： numerical analysis and calibration[J]. , 2016, 35(S2): 3633-3643.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1450 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/3633

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