沥青混合料粘弹性行为ABAQUS有限元模拟

ABAQUS finite element simulation of viscoelasticity behaviors for asphalt mixture

以粘弹性力学理论为基础,选用广义Maxwell模型作为沥青混合料粘弹性的本构关系,运用ABAQUS中的广义Prony级数描述其松弛特性。对应力松弛和TSRST试验进行有限元模拟,并分析降温速率和初始温度对TSRST试验数值模拟的影响。模拟结果表明,数值模拟与试验结果非常接近,采用ABAQUS粘弹性有限元对实际问题进行分析计算是准确可靠的;初始温度与降温速度对模拟结果影响显著;不论起始温度和降温速率如何变化,当温度高于5℃时,数值模拟中的TSRST试件温度收缩应力的累积值非常小;对于新建的沥青路面,在最低气温高于5℃的情况下一般不会产生一次性降温所产生的温度裂缝。

Based on the theory of viscoelasticity, generalized Maxwell model has been used as the constitutive equations of viscoelastic properties of asphalt mixture, and generalized Prony series in ABAQUS was used to describe the stress relaxation of asphalt mixture. Numerical simulation was carried out by ABAQUS on stress relaxation test and TSRST, and the influence of cooling speed and initial temperature on numerical simulation of TSRST was analyzed. The results indicate that, numerical simulation results are very close to test results. It is accurate and reliable that practical problems are analyzed and calculated by viscoelastic finite element of ABAQUS; The initial temperature and cooling speed distinctly affect the result of simulation; No matter how the initial temperature and cooling speed vary, the cumulated value of thermal shrinkage stress in TSRST specimen is low when the temperature is higher than 5 ℃ ; For the newly - built asphalt pavement, if minimum temperature is higher than 5℃ the pavement would not normally have a one - time temperature crack generated by cooling the temperature.