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细观尺度下大孔隙环氧沥青混合料损伤演化分析

Keywords: 大孔隙环氧沥青混合料,双线性内聚力模型,非均质细观结构,裂纹扩展与损伤演化

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Abstract:

通过数字图像技术获取了大孔隙环氧沥青混合料的多相细观结构,建立了包含集料、沥青砂浆、空隙在内的细观结构有限元仿真模型,引入了内聚力模型,通过劈裂试验数值模拟,对内部结构应力响应、裂纹扩展及损伤演化过程进行了分析.研究结果表明:空隙、集料等细观结构的不均匀分布,对混合料的应力响应及其分布均造成一定影响;劈裂试验模拟过程中,损伤变量D值达到1时,试件开始启裂,预设内聚力单元模拟的启裂位置与室内试验观察较为一致,而后裂缝开始扩展,但扩展速率逐渐变小;双线性内聚力模型较好地模拟了混合料损伤规律与裂纹启裂、扩展路径.

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