Research on Propagation and Frictional Heat of Crack in Ultrasonic Fatigue Loading

doi:10.3901/JME.2016.04.103

Abstract

Abstract: The initiation and propagation of the fatigue crack coupled with slightly temperature evolution under high frequency cyclic loading. The evolution of temperature reflects the characteristics of fatigue damage. The evolution of temperature during the initiation and propagation of internal crack in a kind of carbon manganese steel under very high cycle fatigue loading is observed by the 20 kHz ultrasonic fatigue test. A friction modeling of micro-structure of internal fatigue crack is introduced based on heat analysis of internal crack friction during the fatigue damage process of material. Numerical simulation of the friction of internal crack is presented with the fractal theory at the micro scale, and the frictional heat of the process is calculated. The comparison of simulation results with experiment result is presented. The relationship between the micro-crack propagation and frictional heat is discussed. A model of the relationship between crack propagation and temperature evolution of crack surface in ultrasonic fatigue is constructed with considering of the Paris-Hertzberg-McClintock crack growth rate law.

Key words: crack, frictional heat, temperature evolution, ultrasonic fatigue, very high cycle fatigue

CLC Number:

O346

LI Zhi, XUE Hongqian. Research on Propagation and Frictional Heat of Crack in Ultrasonic Fatigue Loading[J]. Journal of Mechanical Engineering, 2016, 52(4): 103-110.

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