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| Numerical Simulation of Thermal Stress Distribution in CF/BMI Composite Subjected to Thermal Cycles |
| YU Qi1, CHEN Ping2, LU Chun1 |
1. School of Aerospace Engineering & Liaoning Key Laboratory of Advanced Polymer Matrix Composites, Shenyang Aerospace University, Shenyang 110136
2. School of Chemical Engineering & Liaoning Key Laboratory of Advanced Polymer Matrix Composites, Dalian University of Technology, Dalian 116024 |
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Cite this article:
YU Qi CHEN Ping LU Chun. Numerical Simulation of Thermal Stress Distribution in CF/BMI Composite Subjected to Thermal Cycles. Chinese Journal of Materials Research, 2012, 26(6): 583-589.
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Abstract Finite element analysis was used to analyze thermal stress distribution in CF/BMI composite under exposure to thermal cycles. Parabolic failure criterion was used to predict the potential failure zone in composite. Birth and death element technique was used to reveal the microcracks distribution in composite induced by thermal stress. Thermal stress at composite free end zone is higher than that in inner zone, and the maximum stress locates at the fiber surface in resin-rich area of free end zone.
The potential failure zones locate at free end zone with the microcracks distributed along the interface, thus leads to interfacial debonding failure in composite. During the following thermal cycle, the thermal stress which is alleviated to some extent and redistributed, extends from free end zone to inner zone, thus exacerbates the degree of interfacial debonding. Properties evolution of CF/BMI composite subjected to thermal cycles were investigated, showing that the interfacial bond property was decreased due to the formation of microcracks along the interface. The numerical simulation results are in good agreement with the experiment results, which reasonably expect the potential failure zone in composite and analyze the reason of decrease in interfacial bond property induced by thermal cycles.
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Received: 20 September 2012
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| Fund: Supported by National Defense 12th 5 year Program Foundational Research Program No.A352xxxxxxx, Scientific Research Fund of Liaoning Provincial Education Department No.L2012055, and Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Dalian University of Technology) of the Education Ministry Foundation No.DP1051204. |
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