THE STUDY ON TOP-DOWN CRACK PROPAGATION IN ASPHALT PAVEMENTS BASED ON THE COUPLED EFG AND FE METHOD
Top-down crack in asphalt pavements has been reported as a widespread mode of failure.A solid understanding of the mechanisms of crack growth is essential to predict pavement performance in the context of thickness design, as well as in the design and optimization of mixtures.By using the coupled element free Galerkin (EFG) and finite element (FE) method, top-down crack propagation in asphalt pavement is numerically simulated based on the fracture mechanics. With the analysis of the following three indicators, the stress intensity factor (SIF) which varies as the crack propagating, the crack path and the fagitue life, the mechanism of top-down crack is discussed.Furthermore, a parametric study is conducted to isolate the effects of various parameter on top-down crack propagation. The results show that the SIF experiences a process sharply ascending- slowly descending- slowly ascending- sharply ascending again as the crack propagating; the thicker overlay or base is, the lower the SIF becomes; the greater overlay stiffness is, the higher the SIF should be;the crack path is obviously affected by the stiffness of overlay and base; the greater the stiffness is,the longer the crack path gets.
Road engineering Top-down crack The coupled EFG and FE method Stress intensity factor Crack propagating path Fatigue life
Hui Luo Hong-Ping Zhu Chuan-Yao Chen
School of Civil Engineering and Mechanics, Huazhong University of Science & Technology,Wuhan 430074, P.R. China Hubei Key Laboratory of Control Structure, Huazhong University of Science & Technology,Wuhan 430074. P.R. China
国际会议
第十届国际结构工程青年学者研讨会(The Tenth International Symposium on Structural Engineering for Young Experts)
长沙
英文
165-171
2008-10-19（万方平台首次上网日期，不代表论文的发表时间）