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Heat Transfer Research
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ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2017014264
pages 935-954

THERMAL-MECHANICAL COUPLING PROPAGATION AND TRANSIENT THERMAL FRACTURE IN MULTILAYER COATINGS

Long Zhang
Department of Engineering Mechanics, Chongqing University, Chongqing, 400044, P.R.China; Department of Theoretical and Applied Mechanics, Chongqing University of Science and Technology, Chongqing, 401331, P.R.China
Xiaomin Zhang
Department of Engineering Mechanics, Chongqing University, Chongqing, 400044, P.R.China
Song Peng
Department of Engineering Mechanics, Chongqing University, Chongqing, 400044, P.R.China
Zimin Yan
Department of Engineering Mechanics, Chongqing University, Chongqing, 400044, P.R.China
Yuan Liang
School of Foreign Language, Chongqing University of Science and Technology, Chongqing, 401331, P.R.China
Bo Yan
Department of Engineering Mechanics, Chongqing University, Chongqing, 400044, P.R.China
Qibin Li
Department of Engineering Mechanics, Chongqing University, Chongqing, 400044, P.R.China

ABSTRACT

A definite solution problem of a coupled thermal-mechanical model is considered for in-plane double-layer coatings, subjected to a heat pulse. The general solution of the governing coupled equations is obtained using the dual-phase lag model of the non-Fourier heat conduction law. The temperature increment T and volumetric strain θ are derived, which are related to the logarithmic heat rate ε. A thermal-mechanical failure analysis of the coating system is made and the possible failure mode is also investigated. The results show that the wave front propagates along the interface because of the reflection and superposition at the convex part of the interface. Transient stress intensity factors of mode I are obtained in the double-layer system with cracks close to the interface. Moreover, the influences of different relaxation times and of the radius of the interface curvature are discussed.


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