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为模拟沥青混凝土的低温断裂行为,合理选择了内聚力本构模型;在获取了小梁试件数字图像的基础上,结合ABAQUS有限元软件建立了二维细观断裂模型,验证了模型的正确性和适用性。结果表明:本文建立的二维细观断裂模型能够很好的反映实际三点弯曲试验的能量消耗—位移响应;沥青混凝土断裂过程可分为试件损伤、裂缝产生、裂缝扩展和试件破坏等四个阶段。
In order to simulate the low temperature fracture behavior of asphalt concrete, a cohesive constitutive model was selected reasonably. On the basis of obtaining the digital images of the trabecular specimens, a 2D mesoscopic fracture model was established with ABAQUS finite element software to verify the correctness of the model And applicability. The results show that the two-dimensional mesoscopic fracture model established in this paper can well reflect the energy consumption-displacement response of the actual three-point bending test. The fracture process of asphalt concrete can be divided into specimen damage, crack generation, crack propagation and specimen destruction four stages.