em>Abstract—This paper deals with the failure analysis of air heat exchanger. The natural frequency and vibration mode of air heat exchanger are obtained based on a three-dimensional finite element model. A flow-induced vibration is analyzed on the basis of modal simulation results. A thermal-structural interaction simulation for air heat exchanger is carried out by using the multi-physical field coupling method. The stress distribution and strain distribution of air heat exchanger are calculated by using the results of temperature field simulation. A Manson-Coffin model based on equivalent plastic strain range and cycle life is used to describe fatigue life, and the equivalent plastic strain range was obtained by the thermal-structural interaction simulation. The analysis results show that the major reason of fatigue failure of air heat exchange tube bundle is the thermal stress and flow-induced vibration.
Index Terms—Heat exchanger, failure, simulation, modal.
The authors are with Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, 116024 China (e-mail: miaoqing@mail.dlut.edu.cn, zhengw@dlut.edu.cn, wanglu@dlut.edu.cn).
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Cite: Q. Miao, Z. Wang, and L. Wang, "A Failure Analysis of Air Heat Exchanger Based on Modal Calculation and Thermal-Structural Interaction Simulation," International Journal of Materials, Mechanics and Manufacturing vol. 5, no. 3, pp. 164-168, 2017.
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