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논문 기본 정보

자료유형
학술대회자료
저자정보
Kuai, Hai Dong (Department of Civil & Environmental Engineering, Sejong University) Lee, Hyn-Jong (Department of Civil & Environmental Engineering, Sejong University) Zi, Goang-Seup (Department of Civil, Environmental & Architectural Engineering Korea University) Mun, Sung-Ho (Expressway & Transportation Research Institute)
저널정보
한국도로학회 한국도로학회 학술발표회 논문집 한국도로학회 2008년도 추계학술대회 논문집
발행연도
2008.1
수록면
93 - 102 (10page)

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An energy based crack growth model is developed in this study to simulate the propagation of top-down cracking in asphalt pavements. A viscoelastic fracture mechanics approach, generalized J integral, is employed to model the crack growth of asphalt concrete. Laboratory fatigue crack propagation tests for three different asphalt mixtures are performed at various load levels, frequencies and temperatures. Disk-shaped specimens with a proper loading fixture and crack growth monitoring system are selected for the tests. It is observed from the tests that the crack propagation model based on the generalized J integral is independent of load levels and frequencies, while the traditional Paris' law model based on stress intensity factor is dependent of loading frequencies. However, both models are unable to take care of the temperature dependence of the mixtures. The fatigue crack propagation model proposed in this study has a good agreement between experimental and predicted crack growth lives, which implies that the energy based J integral could be a better parameter to describe fatigue crack propagation of viscoelastic materials such as asphalt mixtures.

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