Visco-elastoplastic damage constitutive model for compressed asphalt mastic  

作　　者：曾国伟 杨新华 白凡 高虎 

机构地区：[1]School of Civil Engineering and Mechanics, Huazhong University of Science and Technology [2]School of Science, Wuhan University of Science and Technology

出　　处：《Journal of Central South University》2014年第10期4007-4013,共7页中南大学学报（英文版）

基　　金：Project(2011CB013800)supported by the National Basic Research Program of China;Project(10672063)supported by the National Natural Science Foundation of China;Project(Y201119)supported by the Hubei Province Key Laboratory of Systems Science in Metallurgical Process,China

摘　　要：In order to describe the three-stage creep behavior of compressed asphalt mastic, a visco-elastoplastic damage constitutive model is proposed in this work. The model parameters are treated as quadratic polynomial functions with respect to stress and temperature. A series of uniaxial compressive creep experiments are performed at various stress and temperature conditions in order to determine these parameter functions, and then the proposed model is validated by comparison between the predictions and experiments at the other loading conditions. It is shown that very small permanent deformation at low stress and temperature increases rapidly with elevated stress or temperature and the damage may initiate in the stationary stage but mainly develops in the accelerated stage. Compared with the visco-elastoplastic models without damage, the predictions from the proposed model is in better agreement with the experiments, and can better capture the rate-dependency in creep responses of asphalt mastic especially below its softening point of 47 ℃In order to describe the three-stage creep behavior of compressed asphalt mastic, a visco-elastoplastic damage constitutive model is proposed in this work. The model parameters are treated as quadratic polynomial functions with respect to stress and temperature. A series of uniaxial compressive creep experiments are performed at various stress and temperature conditions in order to determine these parameter functions, and then the proposed model is validated by comparison between the predictions and experiments at the other loading conditions. It is shown that very small permanent deformation at low stress and temperature increases rapidly with elevated stress or temperature and the damage may initiate in the stationary stage but mainly develops in the accelerated stage. Compared with the visco-elastoplastic models without damage, the predictions from the proposed model is in better agreement with the experiments, and can better capture the rate-dependency in creep responses of asphalt mastic especially below its softening point of 47 °C.

关 键 词：asphalt mastic visco-elastoplastic damage model compressive creep 

分 类 号：TQ334[化学工程—橡胶工业]