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Computational modeling of fracture in encapsulation-based self-healing concrete using cohesive elements

机译：基于粘结单元的基于封装的自愈混凝土断裂计算模型

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摘要

Fracture behavior of encapsulation- based self-healing concrete (SHC) is investigated numerically. In this paper, we study the influence of capsules including its volume ratio and core-shell thickness on the load carrying capacity and fracture likelihood of the capsules. In order to randomly create the mesoscale structure of self-healing concrete, an efficient packing algorithm is employed. For a given number of circular capsules with particular diameter and shell thickness, the aggregates are generated from prescribed distributions of their size and volume fraction. The capsules are made of Poly Methyl Methacrylate and potential cracks are represented by pre-inserted cohesive elements with tension and shear softening laws along all element boundaries including the interfaces between different phases. The effects of the volume fraction of capsules and core-shell thickness ratio on the load carrying capacity and fracture probability of the capsules are analyzed. It is found that the load-carrying capacity of self-healing concrete decreases as the capsules volume fraction increases. The capsule core-shell thickness ratio has no significant influence on the specimen strength but a very significant impact on the breakage of capsule shell. Given a fixed volume fraction of capsules, the higher core-shell thickness ratio, the higher is the number of capsules which fracture. Assuming the core-shell ratio thickness is fixed, increasing the volume fraction of capsules will increase the probability of capsules which break.
机译：数值研究了基于封装的自修复混凝土（SHC）的断裂行为。在本文中，我们研究了包括其体积比和核壳厚度在内的胶囊对胶囊的承载能力和破裂可能性的影响。为了随机创建自修复混凝土的中尺度结构，采用了一种有效的打包算法。对于给定数量的具有特定直径和壳厚度的圆形胶囊，聚集体由其大小和体积分数的规定分布产生。胶囊由聚甲基丙烯酸甲酯制成，潜在的裂纹由预插入的内聚元素表示，这些元素沿包括不同相之间界面在内的所有元素边界具有拉伸和剪切软化定律。分析了胶囊的体积分数和核壳厚度比对胶囊的承载能力和破裂概率的影响。发现随着胶囊体积分数的增加，自愈混凝土的承载能力降低。胶囊的核壳厚度比对样品强度没有显着影响，但对胶囊壳的破裂影响很大。在胶囊的体积分数固定的情况下，核-壳厚度比越高，破裂的胶囊的数量越高。假设核壳比的厚度是固定的，增加胶囊的体积分数将增加胶囊破裂的可能性。

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  • 来源
    《Composite Structures》 |2018年第7期|63-75|共13页
  • 作者

    Mauludin Luthfi M.; Zhuang Xiaoying; Rabczuk Timon;

  • 作者单位

    Bauhaus Univ Weimar, Inst Struct Mech, D-99425 Weimar, Germany|Gegerkalong Hilir Ds Ciwaruga, Politekn Negeri Bandung, Tekn Sipil, Bandung 40012, Indonesia;

    Tongji Univ, Dept Geotech Engn, Coll Civil Engn, Shanghai 200092, Peoples R China;

    Ton Duc Thang Univ, Div Computat Mech, Ho Chi Minh City, Vietnam|Ton Duc Thang Univ, Fac Civil Engn, Ho Chi Minh City, Vietnam;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Self-healing concrete; Capsules; Core-shell thickness ratio; Cohesive;

    机译：自愈混凝土;胶囊;核壳厚度比;内聚性;

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