基于XFEM和粘结面技术的自愈混凝土愈合裂缝长度和界面粘结性能影响的计算断裂模型

J. Hanna, Ahmed Elamin
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引用次数: 0

摘要

自愈模式是影响自愈混凝土(SHC)结构断裂机制的关键问题。即使在结构的正常运行条件下,如持续施加载荷或快速裂纹扩展,也可能发生部分愈合裂缝。本文通过计算研究了控制愈合模式的两个主要因素,即愈合裂纹长度和固化愈合剂与裂纹表面之间的界面粘结性能对愈合SHC试样的承载能力和断裂机制的影响。提出了基于扩展有限元法(XFEM)和内聚面(CS)技术的计算建模框架,对二维愈合的SHC试样在单轴拉伸试验下的断裂和脱粘机理进行了建模。界面内聚性能和愈合裂缝长度对固化固化剂的承载能力、裂缝的起裂、扩展以及与混凝土基体的脱粘势有显著影响。它们的值越高,承载能力越高。当固化愈合剂的界面内聚性能低于固化愈合剂断裂性能的25%时,固化愈合剂将与混凝土基体发生脱粘。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Computational Fracture Modeling for Effects of Healed Crack Length and Interfacial Cohesive Properties in Self-Healing Concrete Using XFEM and Cohesive Surface Technique
Healing patterns are a critical issue that influence the fracture mechanism of self-healing concrete (SHC) structures. Partial healing cracks could happen even during the normal operating conditions of the structure, such as sustainable applied loads or quick crack spreading. In this paper, the effects of two main factors that control healing patterns, the healed crack length and the interfacial cohesive properties between the solidified healing agent and the cracked surfaces on the load carrying capacity and the fracture mechanism of healed SHC samples, are computationally investigated. The proposed computational modeling framework is based on the extended finite element method (XFEM) and cohesive surface (CS) technique to model the fracture and debonding mechanism of 2D healed SHC samples under a uniaxial tensile test. The interfacial cohesive properties and the healed crack length have significant effects on the load carrying capacity, the crack initiation, the propagation, and the debonding potential of the solidified healing agent from the concrete matrix. The higher their values, the higher the load carrying capacity. The solidified healing agent will be debonded from the concrete matrix when the interfacial cohesive properties are less than 25% of the fracture properties of the solidified healing agent.
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