拉伸荷载作用下裂纹扩展过程及交汇模式试验研究及其数值模拟

doi:10.13722/j.cnki.jrme.2018.1387

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Abstract In numerical simulation，the multi-crack propagation and intersection mode under tensile stress are mainly studied by hypothesis. In order to explore the real mode of multi-crack propagation and intersection under tensile stress，the tensile tests of PMMA specimen with two random cracks and parallel inclined double cracks are carried out. The relationship between the contour distribution characteristics of the displacement field and the precast crack of the specimen under tensile load by digital speckle correlation method，the influence on the crack propagation and the crack intersection form when the specimen destroyed are obtained. Meanwhile，the failure process of the test model under tensile load is simulated with two different intersection mode algorithms based on the extended finite element method. The results show that the existence of precast cracks has a significant effect on the contour distribution of the displacement field under tensile load，and the contour line near the precast crack is approximately perpendicular to the precast，which has a certain influence on the crack propagation path. In the crack propagation process，the pre-crack existing in the front has an inducing effect on the growing crack，deflecting the crack propagation，and finally intersecting it. And it is found that the intersection mode determined in parameterized form based on the coordinates of crack-tip and the normalized direction vector of crack propagation is consistent with the crack intersection mode observed by the test.

Key words： rock mechanics tension load digital speckle correlation method extended finite element method crack propagation intersection mode

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	Articles by authors
	HUANG Zhenghong1
	2
	DENG Shouchun1
	2
	LI Haibo1
	2
	YU Chong1
	2
	ZHENG Xing1
	2

Cite this article:

HUANG Zhenghong1,2,DENG Shouchun1, et al. Experimental study and numerical simulation of crack propagation process and intersection mode under tensile load[J]. , 2019, 38(S1): 2712-2723.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1387 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2712

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