基于RPC试件的爆炸应力波作用下I型裂纹扩展行为的研究

doi:10.13722/j.cnki.jrme.2019.0573

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Abstract In order to study dynamic propagation of mode I cracks under blast loads，a rectangle plate specimen with a crack，prepared by PMMA with good homogeneity and transparency，was proposed in this paper. The experimental system consists of a high dynamic strain amplifier，an oscilloscope，a constant source，strain gauges and crack propagation gauges. The strain gauges and crack propagation gauges(CPGs) were used to measure the blast load and crack propagation speed respectively，and the scanning electron microscope was applied in studying the property of the fracture surface. AUTODYN was applied in simulating crack dynamic propagation behavior. The JWL equation of state(EOS) and a linear EOS were respectively applied to describe the explosive detonation products and the relationship between the pressure and density of PMMA. A modified principle stress failure criterion was employed to assess the material state. Based on displacement extrapolation method，a numerical model was established in ABAQUS code to acquire dynamic stress intensity factors at the crack tip. The experimental and numerical results show that the propagation of mode-I cracks under blast stress wave can be divided into stable propagation and unstable propagation stages，Fracture surface roughness will decline with crack propagation in the stable propagation stage and fracture surface is relatively smooth in the unstable propagation stage. It is also revealed that crack propagation velocity varies in a certain range in the stage of crack stable propagation.

Key words： rock mechanics blast stress wave crack propagation fracture toughness dynamic stress intensity factor

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	Articles by authors
	WAN Duanying1
	2
	ZHU Zheming1
	2
	LIU Ruifeng1
	2
	LIU Bang1
	2
	LI Jianfei1
	2

Cite this article:

WAN Duanying1,2,ZHU Zheming1, et al. Study of propagation behaviors of mode I cracks under blasting stress#br# wave based on RPC specimens[J]. , 2019, 38(12): 2478-2490.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0573 OR http://www.rockmech.org/EN/Y2019/V38/I12/2478

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