Fatigue-creep damage interaction model of asphalt mixture under the semi-sine cycle loading
Fatigue-creep damage interaction model of asphalt mixture under the semi-sine cycle loading
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DOI：
10.1016/j.conbuildmat.2020.119070
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发表时间：
2020-08-10
影响因子：
7.4
通讯作者：
Yang, Yi
中科院分区：
文献类型：
--
作者：
Liu, Hongfu;Yang, Xinyu;Yang, Yi
为了合理描述沥青混合料在半正弦循环荷载作用下的疲劳-蠕变损伤交互作用，根据半正弦疲劳应力可分解为蠕变应力和简单疲劳应力的原理，进行了0.5、1、1.5和2 MPa 4种应力水平下的直接拉伸疲劳试验。另外，在0.25、0.5、0.75、1 MPa四个应力水平下进行了拉压疲劳和静态蠕变试验。对于每个测试，在相同的应力水平下进行五个平行测试。采用Chaboche疲劳损伤模型和Kachanov蠕变损伤模型对混合料在疲劳和蠕变试验中的损伤演化进行了分析。根据试验结果，揭示了不同试验过程和应力水平下的损伤演化趋势，得到了3种不同试验方法的损伤演化模型。基于半正弦疲劳应力分解原理，以归一化参数（X = N/N-f = t/t（R））为中间变量，建立了考虑疲劳和蠕变损伤交互作用的疲劳-蠕变损伤交互作用模型。结果表明，沥青混合料在半正弦循环荷载作用下的损伤不是疲劳损伤和蠕变损伤的简单线性累积，而是疲劳损伤、蠕变损伤以及疲劳-蠕变损伤相互作用的综合结果。疲劳-蠕变损伤交互作用模型与实验数据吻合较好，与经典损伤模型具有较高的一致性。该模型能够较好地描述沥青混合料在半正弦循环荷载作用下的损伤演化趋势以及疲劳损伤和蠕变损伤的交互作用。(C)2020爱思唯尔有限公司保留所有权利。
To describe the interaction of fatigue-creep damage of an asphalt mixture under the action of semi-sine cyclic loading reasonably, a direct tension fatigue test was carried out under four different stress levels (0.5, 1, 1.5, and 2 MPa) based on the fact that semi-sine fatigue stress can be decomposed into creeping stress and simple fatigue stress. In addition, tension-compression fatigue and static creep tests were carried out under four stress levels: 0.25, 0.5, 0.75, 1 MPa. For each test, five parallel tests were carried out at the same stress level. The Chaboche fatigue damage model and Kachanov creep damage model were employed to evaluate the damage evolution of the mixture both in the fatigue and creep tests. According to the test results, the damage evolution trends were revealed under different test processes and stress levels, and the damage evolution models of three different test methods were obtained. Then, based on the principle of semi-sine fatigue stress decomposition, a fatigue-creep damage interaction model considering the interaction of fatigue and creep damage was established using normalized parameters (X = N/N-f = t/t(R)) as the intermediate variable. The results indicated that the damage of asphalt mixture under the action of the semi-sine cyclic load was not a simple linear accumulation of fatigue damage and creep damage, but an overall result of the interaction of fatigue damage, creep damage, and fatigue-creep damage. The fatigue-creep damage interaction model provided a good fit with the experimental data and showed a high degree of consistency with the classical damage model. The model could be used to describe the damage evolution trend of asphalt mixture under the action of semi-sine cycle load and the interaction effect of fatigue damage and creep damage. (C) 2020 Elsevier Ltd. All rights reserved.