High Cycle Fatigue Behavior Evaluation of Q235 Steel Based on Energy Dissipation

  • FAN Junling
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  • Aircraft Strength Research Institute, AVIC, Xi'an 710065

Received date: 2017-05-27

  Revised date: 2017-10-10

  Online published: 2018-03-20

Abstract

Using the theories of macro micro mechanics and continuum thermodynamics, the energy dissipation calculation method is derived for high-cycle fatigue evaluation. The local heat diffusion equation is used to create a method for rapid fatigue limit evaluation. This method with definite physical meaning eliminates the arguments on the thermographic method. Fatigue limits by the traditional tests and the present method are compared, and an error of 9.9% is given, showing the accuracy of this method. It is shown that in the process of fatigue when the heat generation rate is equal to the heat dissipation rate, the energy dissipation tends to be an asymptotic value. Therefore, the limiting energy is determined as the product of the energy dissipation and the whole fatigue life, and a method for rapid fatigue life prediction is developed. It is noted that the slope of the predicted S-N curve, with an error of 9.4%, is in good agreement with the traditional result. Consequently, the potential prospect of the present method in rapid fatigue behavior evaluation is presented.

Cite this article

FAN Junling . High Cycle Fatigue Behavior Evaluation of Q235 Steel Based on Energy Dissipation[J]. Journal of Mechanical Engineering, 2018 , 54(6) : 1 -9 . DOI: 10.3901/JME.2018.06.001

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