Fatigue behavior of carbon steel by symmetric bending ultrasonic frequency method

Weiwei Tang; Hong Wang; Lixun Cai

doi:10.1117/12.839351

27 August 2009 Fatigue behavior of carbon steel by symmetric bending ultrasonic frequency method

Weiwei Tang, Hong Wang, Lixun Cai

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73755O (2009) https://doi.org/10.1117/12.839351
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

In order to further broaden the scope of the study on ultrasonic fatigue test and realize a variety of loading, a new experimental method named as symmetric bending ultrasonic fatigue (SBUF) method to determine the fatigue behavior of materials by symmetric bending loading is presented in this paper. A series of SBUF tests of two carbon steels with stress ratio R = -1 were carried out. Fatigue behaviors of the two carbon steels were researched by SBUF tests. The results show that the S-N curves under ultrasonic symmetric bending loading display the characteristic of "continually decreasing type" up to 10⁹ cycles and exhibit no traditional horizontal plateau beyond 10⁶ cycles, when the fatigue cycles is over 10⁹, fatigue failure do occurs; S-N curves under ultrasonic symmetric bending loading can be described with the equation of Basquin. Compared to the S-N curves under the axial ultrasonic symmetric tension-compression loading, the results show that in high-cycle stage (<10⁷cycles), the loading method has a significant effect on fatigue properties, but in ultra-high-cycle stage (>10⁷cycles), the loading method has no significant impact on fatigue properties. An influence coefficient of the loading method is introduced in order to describe the influence of loading method of the ultrasonic fatigue.

Citation Download Citation

Weiwei Tang, Hong Wang, and Lixun Cai "Fatigue behavior of carbon steel by symmetric bending ultrasonic frequency method", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73755O (27 August 2009); https://doi.org/10.1117/12.839351

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