无限大平板黏聚裂纹模型的数值解

发布时间：2018-05-02 19:02

本文选题：混凝土 + 裂缝　；参考：《水利学报》2014年S1期

【摘要】：本文采用数值方法分析了混凝土非线性断裂中断裂过程区的力学特性。以无限大板中心拉伸裂缝模型为例,在黏聚裂纹模型的基础上,假设裂纹尖端应力奇异性消失,将过程区黏聚力表达式转化为Fredholm II型积分方程,并通过数值积分方法求解。本文得到了断裂过程区上的位移分布,黏聚力分布,断裂过程区长度与外荷载之间的关系,并得出了最大荷载与初始裂纹长度的关系,并讨论了混凝土断裂的其它特性。
[Abstract]:In this paper, the mechanical properties of fracture process zone in nonlinear fracture of concrete are analyzed by numerical method. Taking the center tensile crack model of infinite plate as an example, the stress singularity at the crack tip is assumed to disappear on the basis of the cohesive crack model, and the cohesive force expression in the process zone is transformed into the Fredholm II integral equation, and solved by numerical integration method. In this paper, the relationship between displacement distribution, cohesive force distribution, length of fracture process zone and external load is obtained, and the relationship between maximum load and initial crack length is obtained, and other characteristics of concrete fracture are discussed.
【作者单位】：重庆交通大学河海学院;
【基金】：交通部应用基础项目(2012319814210) 重庆市科委项目(cstc2012jj A1026)
【分类号】：TU528

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