低应变状态下橡胶混凝土细观裂缝数值分析

为了研究橡胶混凝土内部微裂缝的开展形态和影响裂缝开展的原因,基于APDL语言对ANSYS进行二次开发,建立了由砂浆、骨料、橡胶、橡胶-砂浆界面、骨料-砂浆界面五相组成的随机骨料模型,进行了橡胶混凝土压缩模拟,并在此基础上使用灰度识别对各级配骨料及橡胶分布与裂缝分布的关系进行了研究。结果表明裂缝在橡胶分布密集区域快速开展,低橡胶掺量时裂缝像素个数与橡胶分布密集度成正比;高橡胶掺量时裂缝像元个数随橡胶分布密集度的提高先减少后提高。

Numerical Analysis of Micro-cracks in Rubber Concrete under Low Strain Conditions

To explore the propagation form of micro-cracks in rubber concrete and the factors affecting crack propagation, a random aggregate model composed of five phases (mortar, aggregate, rubber, rubber-mortar interface, and aggregate-mortar interface) was established by ANSYS redevelopment in APDL language. The model was applied to simulating the compression of rubber concrete, and on such basis, the relations of aggregate gradation with rubber and cracks distribution were examined by using grayscale recognition. Results illustrated that cracks developed rapidly in areas with dense rubber distribution. The number of crack pixels was proportional to the density of rubber distribution in the presence of low rubber content; when rubber content was high, the number of crack pixels first decreased and then increased with the densification of rubber distribution.