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首页> 外文会议>R. Lytton Symposium on Mechanics of Flexible Pavements; 20050601-03; Baton Rouge,LA(US) >The Development of a Microstructural-Based Continuum Model for Hot Mix Asphalt
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The Development of a Microstructural-Based Continuum Model for Hot Mix Asphalt

机译：基于微观结构的热拌沥青连续体模型的开发

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摘要

Permanent deformation is one of the primary distresses in hot mix asphalt (HMA). It is influenced by the properties of the mix constituents including microstructural features such as aggregate directional distribution (anisotropy), and damage. Conventional continuum constitutive models do not explicitly consider the influence of microstructure distribution on the macroscopic response. The main objective of this paper is to develop an elasto-visco-plastic continuum model that accounts for aggregate directional distribution and damage. This is accomplished by modifying the Drucker-Prager yield function to account for these microstructural features. This yield function is incorporated into Perzyna's viscoplastic flow function. The model is implemented in finite element (FE) using an implicit numerical integration algorithm. FE analysis is conducted to study the influence of key factors such as anisotropy and damage on the model response. In addition, the FE model is used to simulate the response of HMA to compressive and extension triaxial tests at different loading rates and confining pressures, and the numerical results are compared to experimental measurements.
机译：永久变形是热拌沥青（HMA）的主要困扰之一。它受混合成分特性的影响，包括微观结构特征，如聚集体的方向分布（各向异性）和损伤。传统的连续本构模型没有明确考虑微观结构分布对宏观响应的影响。本文的主要目的是建立一个弹-粘塑性连续体模型，该模型考虑了总的方向分布和损伤。这可以通过修改Drucker-Prager屈服函数以解决这些微结构特征来实现。该屈服函数被合并到Perzyna的粘塑性流动函数中。该模型使用隐式数值积分算法在有限元（FE）中实现。进行有限元分析以研究诸如各向异性和损伤等关键因素对模型响应的影响。此外，有限元模型用于模拟HMA在不同加载速率和围压下对压缩和拉伸三轴试验的响应，并将数值结果与实验测量结果进行比较。

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