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首页> 外文期刊>Journal of materials in civil engineering >Three-Dimensional Simulations of Asphalt Pavement Permanent Deformation Using a Nonlinear Viscoelastic and Viscoplastic Model
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Three-Dimensional Simulations of Asphalt Pavement Permanent Deformation Using a Nonlinear Viscoelastic and Viscoplastic Model

机译：非线性粘弹性和粘塑性模型对沥青路面永久变形的三维模拟

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The writers recently developed a nonlinear viscoelastic-viscoplastic constitutive model, in order to represent the response of asphalt mixtures under different temperatures and rates of loading. This model has been implemented in the finite-element (FE) code Abaqus via the user material subroutine UMAT, and it was verified through comparisons with experimental data of asphalt mixtures at various stress levels and temperatures. This research develops a three-dimensional FE model using Abaqus to represent a three-layer pavement structure and to simulate the viscoelastic and viscoplastic responses under repeated loading at different temperatures. The results demonstrate the capability of the model in simulating the influence of temperature on permanent deformation and in predicting viscoelastic and viscoplastic strain distributions in the asphalt layer. The simulations show that tensile viscoplastic strain accumulates at the pavement surface, a phenomenon that could be associated with cracking of asphalt pavements. In addition, the results show that at high pavement temperature (40 ℃), tensile viscoplastic strain develops at the sides of the applied load due to asphalt mixture heave associated with permanent deformation and dilation.
机译：作者最近开发了一种非线性粘弹-粘塑性本构模型，以表示沥青混合物在不同温度和加载速率下的响应。该模型已通过用户材料子例程UMAT在有限元（FE）代码Abaqus中实现，并且通过与各种应力水平和温度下的沥青混合料的实验数据进行比较进行了验证。这项研究使用Abaqus开发了三维有限元模型，以表示三层路面结构，并模拟了在不同温度下反复加载下的粘弹性和粘塑性响应。结果证明了该模型在模拟温度对永久变形的影响以及预测沥青层中的粘弹性和粘塑性应变分布方面的能力。模拟表明，拉伸粘塑性应变累积在路面上，这种现象可能与沥青路面开裂有关。此外，结果表明，在较高的路面温度（40℃）下，由于沥青混合料的胀大与永久变形和膨胀有关，在施加荷载的侧面会产生拉伸粘塑性应变。

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