基于VB-SCSC岩石试样的动态断裂韧度测试方法研究

doi:10.13722/j.cnki.jrme.2017.0351

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Abstract In order to arrest the extending cracks，the specimen with SCSC configuration has been improved，and a new type of specimen with VB-SCSC configuration having a V-shaped boundary was thus proposed in this paper. Under the impacting loads，the compressive stress waves propagate towards the crack tips，and the compressive stress waves restrain the propagating of cracks. The experiments were performed by using the impact load of low & medium speed and the crack propagation time and propagation speed were measured with the propagation gauges(CPGs). The VB-SCSC specimens with three angles of V-shaped bottoms 120°，150° and 180°(straight bottom) were tested，and the former two specimens have the arrest function on the propagating cracks. The finite difference code AUTODYN was applied in the simulation of crack propagation behavior，and the results agree well with the test results. The finite element code ABAQUS was applied in the calculation of stress intensity factors，and Freund?s function was applied in the correction of stress intensity factors. Finally，the dynamic fracture toughness was determined by using the crack initiation time and propagation time. The results show that the 120° VB-SCSC specimens arrest the propagating cracks well and are recommended for the future experimental study. The dynamic fracture toughness is inversely proportional to the crack propagation speed.

Key words： rock mechanics dynamic crack arrest V-shaped boundary of SCSC numerical simulation crack arrest toughness

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	Articles by authors
	WANG Xiaomeng1
	2
	ZHU Zheming1
	2
	SHI Zebing1
	2
	FAN Yong1
	2
	KANG Jiming1
	2

Cite this article:

WANG Xiaomeng1,2,ZHU Zheming1, et al. A method measuring dynamic fracture toughness of rock using VB-SCSC specimens#br#[J]. , 2018, 37(2): 302-311.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0351 OR http://www.rockmech.org/EN/Y2018/V37/I2/302

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