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为了研究沥青混凝土的疲劳特性,提出了基于双线性内聚力模型(CZM)的数值模拟方法.建立了疲劳损伤演化模型并将其与内聚力模型耦合,以反映沥青混凝土在循环荷载作用下的软化行为.通过编制用户材料子程序,实现了疲劳损伤模型在有限元软件ABAQUS中的应用,并对劈裂疲劳试验进行了模拟.研究结果表明:模拟得到的疲劳寿命与实验室结果基本一致;疲劳损伤随加载次数的累积是非线性的,且损伤累积阶段是疲劳破坏的主要阶段;应力比增大时,损伤稳态发展阶段的寿命明显减小.可以发现提出的疲劳损伤数值模型是一种预估沥青混凝土疲劳损伤的有效方法.
In order to study the fatigue characteristics of asphalt concrete, a numerical simulation method based on bilinear cohesion model (CZM) is proposed.The fatigue damage evolution model is established and coupled with the cohesion model to reflect the softening behavior of asphalt concrete under cyclic loading The application of fatigue damage model in finite element software ABAQUS was realized by compiling user material subroutine, and the splitting fatigue test was simulated.The results show that the simulated fatigue life is basically the same as that in laboratory, and the fatigue damage The cumulative number of loadings is non-linear, and the cumulative damage stage is the main stage of fatigue failure. When the stress ratio increases, the life span of the damaged stage of steady damage decreases obviously. It can be found that the proposed fatigue damage numerical model is an estimation Effective method of fatigue damage of asphalt concrete.