Mesomechanical modeling of the thermo-viscoelastic, thermo-viscoplastic, and thermo-viscodamage response of asphalt concrete
Mesomechanical modeling of the thermo-viscoelastic, thermo-viscoplastic, and thermo-viscodamage response of asphalt concrete
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DOI：
10.1007/s12572-011-0028-9
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发表时间：
2011-12-01
影响因子：
0.9
通讯作者：
Little, Dallas N.
中科院分区：
文献类型：
--
作者：
Abu Al-Rub, Rashid K.;You, Taesun;Little, Dallas N.
本文重点研究了沥青混凝土混合料的热-力学响应的细观计算模型，首次采用了压缩耦合的热粘弹、热粘塑性和热粘损伤本构模型。沥青混凝土是由二维图像的微观结构，包括三个阶段：集料，基质，和界面传输区（ITZ）。基体和界面被认为是热粘弹性，热粘塑性，和热粘损伤材料，而骨料被认为是弹性的。研究了单轴拉伸、压缩和反复蠕变-恢复加载条件下，骨料形状、分布、体积分数、界面强度、应变率和温度变化对沥青混凝土的降解和微损伤模式的影响。结果表明，集料体积分数及其分布对沥青混凝土的细观力学响应有显著影响。研究结果表明，本文提出的沥青混凝土本构模型可以根据沥青混凝土微观结构组分的分布及其性质，为预测沥青混凝土的宏观性能提供计算工具。因此，该计算模型的结果可以用于指导沥青混凝土混合料的设计。
This paper focuses on the meso-scale computational modeling of the thermo-mechanical response of asphalt concrete mixes using for the first time a compressive coupled thermo-viscoelastic, thermo-viscoplastic, and thermo-viscodamage constitutive model. Asphalt concrete is represented by two-dimensional images of the microstructure that consist of three phases: aggregate, matrix, and interfacial transmission zone ( ITZ). The matrix and ITZ are considered as thermo-viscoelastic, thermo-viscoplastic, and thermo-viscodamaged materials, while the aggregate is considered to be elastic. The effects of variation in aggregate shape, distribution, volume fraction, ITZ strength, strain rate, and temperature on the degradation and micro-damage patterns in asphalt concrete are investigated under uniaxial tension, compression, and repeated creep-recovery loading conditions. It is concluded that the aggregate volume fraction and distribution significantly influence the micromechanical response of asphalt concrete. Additionally, the results indicate that the constitutive model presented in this paper can provide a computational tool for predicting the overall macroscopic behavior of asphalt concrete based on the distribution of the microstructure constituents and the properties of these constituents. As such, the results of this computational model can be used to guide the design of asphalt concrete mixtures.