裂纹止裂技术及裂纹动态扩展规律研究

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Abstract In order to study the crack dynamic propagation behavior of cement fly ash mortar under dynamic loading, a large-scale semi-circular edge crack with V-shaped bottom (SECVB) specimen was proposed.The V-shaped bottom has crack arrest function and has three angles of 180, 150 and 120 degrees.Impact tests were carried out with a drop impact device, and crack propagation parameters were measured with Crack propagation gauges (CPGs).The finite difference code AUTODYN was used to simulate the crack propagation behavior, and the finite element program ABAQUS was used to calculate the dynamic stress intensity factor (DSIF).The critical stress intensity factor was determined according to the crack initiation time and propagation time measured by CPG.Experimental and numerical results show that SECVB specimens are suitable for studying crack propagation and crack arrest behavior of cement fly ash mortar under dynamic loading.In the process of crack propagation, the crack may stop for a period of time, and the fracture toughness of cement fly ash mortar crack at the beginning is higher than that of crack propagation.

Key words： mortar specimen impact loading crack arrest technique V-shaped bottom

Received: 28 September 2018 Published: 15 February 2020

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	Articles by authors
	LANG Lin1
	2
	ZHU Zheming1
	2
	WAN Duanying1
	2
	DENG Shuai1
	2
	WANG Lei1
	2
	WANG Xingyu1
	2

Cite this article:

LANG Lin1,2,ZHU Zheming1, et al. A study on crack arrest technology and dynamic propagation law of crack[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(4): 38-48.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I4/38

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