ABSTRACT

In this paper, fatigue response under cyclic loading of a high-modulus asphalt mixture (EME14) is numerically investigated based on a coupling approach between damage mechanics and visco-elastoplasticity. The DBN (Di Benedetto-Neifar) model along, an isotropic damage, and a fatigue damage law are adopted to implement both visco-elastoplastic and damage constitutive equations. A set of laboratory experiments are conducted to calibrate the numerical model parameters. In the small deformation domain, complex modulus test results (complex modulus and viscosity) were experimentally fitted based on the 2S2P1D model. Direct tension parameters (stress levels in tension and in compression) were identified through the Di Benedetto viscoplastic criterion. Then, the experimental results of the fatigue test were interpreted to evaluate the damage amount associated with each cycle N and accordingly processed by the DGCB method, developed at the ENTPE (École Nationale des Travaux Publics de l’Etat), to eliminate parasitic effects commonly present in fatigue tests. Hence, a MATLAB program was implemented for uniaxial tension and compression load to estimate damage and fatigue modulus. The consistency between the numerical model outcomes and the experimental measurements showcased the capability of our coupling approach to accurately predict fatigue response under cyclic loading of a high-modulus asphalt mixture (EME14).

摘要

在本文中，基于损伤力学和粘弹塑性之间的耦合方法，数值研究了高模量沥青混合料 (EME14) 在循环载荷下的疲劳响应。采用 DBN (Di Benedetto-Neifar) 模型、各向同性损伤和疲劳损伤定律来实现粘弹塑性和损伤本构方程。进行了一组实验室实验以校准数值模型参数。在小变形域，复数模量测试结果（复数模量和粘度）基于2S2P1D模型进行实验拟合。通过 Di Benedetto 粘塑性准则确定直接张力参数（张力和压缩应力水平）。然后，疲劳测试的实验结果被解释为评估与每个循环 N 相关的损坏量，并相应地通过 ENTPE（École Nationale des Travaux Publics de l'Etat）开发的 DGCB 方法进行处理，以消除通常存在的寄生效应疲劳测试。因此，针对单轴拉伸和压缩载荷实施了 MATLAB 程序，以估计损伤和疲劳模量。数值模型结果与实验测量结果之间的一致性展示了我们的耦合方法能够准确预测高模量沥青混合料 (EME14) 循环载荷下的疲劳响应。消除疲劳测试中常见的寄生效应。因此，针对单轴拉伸和压缩载荷实施了 MATLAB 程序，以估计损伤和疲劳模量。数值模型结果与实验测量结果之间的一致性展示了我们的耦合方法能够准确预测高模量沥青混合料 (EME14) 循环载荷下的疲劳响应。消除疲劳测试中常见的寄生效应。因此，针对单轴拉伸和压缩载荷实施了 MATLAB 程序，以估计损伤和疲劳模量。数值模型结果与实验测量结果之间的一致性展示了我们的耦合方法能够准确预测高模量沥青混合料 (EME14) 循环载荷下的疲劳响应。