Micro‐mechanical damage and rough crack closure in cementitious composite materials
Micro‐mechanical damage and rough crack closure in cementitious composite materials
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DOI：
10.1002/nag.551
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发表时间：
2007-02
影响因子：
4
通讯作者：
A. Jefferson;T. Bennett
中科院分区：
文献类型：
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作者：
A. Jefferson;T. Bennett
提出了一种基于细观力学的损伤模型，该模型采用含有硬币状裂纹的弹性体的解。这项工作的主要新方面是在模型中加入了一个粗略的裂纹闭合组件。该模型使用了一个用变换应变分量描述的损伤面。通过考虑弹性材料等效带上的总方向应变，然后去掉弹性分量，计算出每个方向上的非弹性应变分量。在Mathcad表格中给出了模型实现的详细信息。给出了单轴和双轴拉伸和压缩应力/应变路径的一系列单点模拟结果。每条路径都是用完整的模型和不模拟裂纹闭合效应的仅损伤模型来计算的。结果表明，粗糙接触分量的加入使模型能够再现压缩膨胀峰后行为，并能以合理的精度模拟水泥基复合材料的双向强度包络的形状。版权所有©2006 John Wiley&Sons，Ltd.
A micro‐mechanics based damage model is presented which uses the solution of an elastic body with penny‐shaped cracks. The major new aspect of the work is the inclusion of a rough crack closure component in the model. The model uses a damage‐surface, described in terms of transformed strain components. Inelastic strain components in each direction are computed by considering the total directional strains on an equivalent band of elastic material and then removing the elastic component. Details of the model implementation in a Mathcad sheet are given. The results from a series of single point simulations are given for uniaxial and biaxial tension and compression stress/strain paths. Each path is computed with the full model and with a damage only version of the model which does not simulate crack closure effects. It is shown that the incorporation of the rough contact component allows the model to reproduce dilatant post‐peak behaviour in compression and to simulate, with reasonable accuracy, the shape of the biaxial strength envelope for cementitious composite materials. Copyright © 2006 John Wiley & Sons, Ltd.