A micromechanical study of the breakage mechanism of microcapsules in concrete using PFC2D
A micromechanical study of the breakage mechanism of microcapsules in concrete using PFC2D
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使用 PFC2D 进行混凝土微胶囊破裂机理的微观力学研究
DOI：
10.1016/j.conbuildmat.2016.04.067
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发表时间：
2016-07
影响因子：
7.4
通讯作者：
Zhang Lianyang
中科院分区：
文献类型：
--
作者：
Zhou Shuai;Zhu Hehua;Yan Zhiguo;Ju J Woody;Zhang Lianyang
Concrete containing micro-encapsulated healing agents is appealing due to its self-healing capacity. Although much research has been conducted on concrete containing microcapsules, the mechanism for their breakage due to microcracking is still not well understood. By considering microcapsules as circular voids, this paper uses the two-dimensional particle flow code (PFC2D) to study the fracturing behavior of concrete specimens containing one microcapsule and one microcrack. Specifically, the PFC2D model was first developed and validated based on experimental results. Then the validated model was used to systematically study the initiation, propagation and coalescence of cracks and the corresponding stress and strain at each cracking stage. The results indicate that the propagating cracks include both the first (primary) and secondary cracks. The initiation location and stress of the first cracks depend on both the preexisting crack inclination angle and the ligament length. The initiation and propagation of the first and secondary cracks disturb the stress and displacement fields of the specimen. The crack coalescence between the preexisting crack and the hole is also influenced by the preexisting crack inclination angle and the ligament length. The research enhances the understanding of the effect of different factors on the cracking behavior of concrete containing a circular hole and a preexisting crack and paves the way for using discrete element method (DEM) to investigate the breakage mechanism of microcapsules in concrete.
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DOI：
10.1201/b14917-31
发表时间：
2013
期刊：
ISRM SINOROCK
影响因子：
--
作者：
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通讯作者：
Chun Junwei;X. Zhuang;Hehua Zhu;Chen Xueqin
影响因子：
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作者：
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影响因子：
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DOI：
10.1016/s0148-9062(98)00005-9
发表时间：
1998-10-01
影响因子：
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作者：
Bobet, A;Einstein, HH
通讯作者：
Einstein, HH
DOI：
10.1016/j.ijrmms.2011.09.016
发表时间：
2011-12
影响因子：
7.2
作者：
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通讯作者：
Qi Zhang;Hehua Zhu;Lianyang Zhang;Xiaobin Ding