Characterization of Loading Rate Effects on the Interactions Between Crack Growth and Inclusions in Cementitious Material

• 作者: Shuai Zhou Xiaoying Zhuang
• 来源期刊: 计算机、材料和连续体(英文)
• 学科: 工学
• 关键词: MICROCAPSULE LOADING rate CRACKING processes DEM COMPRESSIVE LOADING
• 年，卷（期）: 2018,（12）
• 页码范围: 417-446
• 页数: 30页
• 分类号: TG1

摘要

The microcapsule-enabled cementitious material is an appealing building material and it has been attracting increasing research interest.By considering microcapsules as dissimilar inclusions in the material,this paper employs the discrete element method(DEM)to study the effects of loading rates on the fracturing behavior of cementitious specimens containing the inclusion and the crack.The numerical model was first developed and validated based on experimental results.It is then used to systematically study the initiation,the propagation and the coalescence of cracks in inclusion-enabled cementitious materials.The study reveals that the crack propagation speed,the first crack initiation stress,the coalescence stress,the compressive strength and the ultimate strain increase with the loading rate.The initiation position,the propagation direction,the cracking length and the type of the initiated cracks are influenced by the loading rates.Two new crack coalescence patterns are observed.It is easier to cause the coalescence between the circular void and a propagating crack at a slow loading rate than at a fast loading rate.