Title of Paper:对流和辐射换热对金属高周疲劳能量耗散估计的影响

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Date of Publication:2022-06-30

Journal:Jixie Gongcheng Xuebao/Journal of Mechanical Engineering

Volume:57

Issue:10

Page Number:187-195

ISSN No.:0577-6686

Abstract:Fatigue fracture is the main reason of failure for engineering structures and components. Due to the disadvantages of traditional fatigue prediction methods, such as long cycle and high economic cost, the rapid evaluation of high cycle fatigue performance of metals based on infrared thermography has attracted wide attention. During the high-cycle fatigue experiments of metal materials, the irreversible energy dissipation which causes the temperature rise of the sample is taken as a key index in the infrared thermography method, and the accuracy of the estimated dissipation determines the precision of the fatigue performance evaluation. A high-cycle fatigue energy dissipation estimation method is proposed based on infrared thermography, and a natural convection and radiation heat resistance is introduced according to the heat transfer theory. The correctness and precision of the present method are verified through the numerical simulation and experimental procedure. It is found that the heat loss caused by natural convection and radiation cannot be directly ignored when energy dissipation is estimated in high-cycle fatigue experiments. The present method is compared with the temperature drop method which also considered convection and radiation effects. The results show that the temperature drop method is suitable for the estimation of local energy dissipation and is very sensitive to time, while the present method is more suitable for the fatigue experiment of smooth flat sample, and the process is simple with stable results, which is convenient for the application in engineering practice. © 2021 Journal of Mechanical Engineering.

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