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Journal of Zhejiang University SCIENCE A 2010 Vol.11 No.3 P.223-230

http://doi.org/10.1631/jzus.A0900248


Simulation of top-down crack propagation in asphalt pavements


Author(s):  Hui LUO, Hong-ping ZHU, Yu MIAO, Chuan-yao CHEN

Affiliation(s):  School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China; more

Corresponding email(s):   hpzhu@mail.hust.edu.cn

Key Words:  Road engineering, Top-down crack, Coupled element free Galerkin (EFG) and finite element (FE) method, Stress intensity factor (SIF), Crack propagating path


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Hui LUO, Hong-ping ZHU, Yu MIAO, Chuan-yao CHEN. Simulation of top-down crack propagation in asphalt pavements[J]. Journal of Zhejiang University Science A, 2010, 11(3): 223-230.

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author="Hui LUO, Hong-ping ZHU, Yu MIAO, Chuan-yao CHEN",
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pages="223-230",
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doi="10.1631/jzus.A0900248"
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%T Simulation of top-down crack propagation in asphalt pavements
%A Hui LUO
%A Hong-ping ZHU
%A Yu MIAO
%A Chuan-yao CHEN
%J Journal of Zhejiang University SCIENCE A
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%@ 1673-565X
%D 2010
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0900248

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T1 - Simulation of top-down crack propagation in asphalt pavements
A1 - Hui LUO
A1 - Hong-ping ZHU
A1 - Yu MIAO
A1 - Chuan-yao CHEN
J0 - Journal of Zhejiang University Science A
VL - 11
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SP - 223
EP - 230
%@ 1673-565X
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A0900248


Abstract: 
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. Using the coupled element free Galerkin (EFG) and finite element (FE) method, top-down crack propagation in asphalt pavements is numerically simulated on the basis of fracture mechanics. A parametric study is conducted to isolate the effects of overlay thickness and stiffness, base thickness and stiffness on top-down crack propagation in asphalt pavements. The results show that longitudinal wheel loads are disadvantageous to top-down crack because it increases the compound stress intensity factor (SIF) at the tip of top-down crack and shortens the crack path, and thus the fatigue life descends. The SIF experiences a process “sharply ascending—slowly descending—slowly ascending—sharply ascending again” with the crack propagating. The thicker the overlay or the base, the lower the SIF; the greater the overlay stiffness, the higher the SIF. The crack path is hardly affected by stiffness of the overlay and base.

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Reference

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