点击次数：

论文类型：期刊论文

发表时间：2021-01-10

发表刊物：CONSTRUCTION AND BUILDING MATERIALS

卷号：264

ISSN号：0950-0618

关键字：Asphalt concrete; Visco-elastic; K-R creep damage theory; Finite element method

摘要：The creep of asphalt and asphalt concrete were numerically studied extensively. However, most of the previous studies only researched the decelerated creep stage and equi-velocity creep stage while rarely shed light on the accelerated creep stage. This paper proposes a novel 3 dimensional visco-elastic damage model utilizing two spring and one dashpot components coupled with Kachanov and Robotnov (K-R) creep damage theory to describe the whole stages of the creep of asphalt and asphalt concrete, i.e., decelerated creep stage, equi-velocity creep stage, and accelerated creep stage. The damage evolution equation based on the K-R creep damage theory is integrated into the visco-elastic constitutive model by the continuum mechanics, and then the uniaxial creep damage solution is deducted. A robust numerical algorithm of this model is developed. Through numerical tests on uniaxial compression and pre-notched three-point bending beam, the numerical curves are analogue to measured creep curves, which justifies the accuracy and efficiency of the visco-elastic model coupling with K-R creep damage theory and the corresponding numerical algorithm. This paper provides not only an accurate and robust creep damage constitutive model for the asphalt and asphalt concrete, but also a valuable model and an efficient numerical method to evaluate the damage and rupture behavior of large-scale infrastructures fabricated by asphalt and asphalt concrete. (C) 2020 Elsevier Ltd. All rights reserved.