Study on the Crack Extension Properties under Ultrasonic Vibration Uniaxial Tensile Load

Xue Li Cheng; Chang Liu Tian

doi:10.4028/www.scientific.net/AMR.538-541.1751

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 538-541Study on the Crack Extension Properties under...

Study on the Crack Extension Properties under Ultrasonic Vibration Uniaxial Tensile Load

Abstract:

In this paper, the ultrasonic vibration uniaxial tension experiment was carried out on the 20# steel with a set of ultra-high-frequency vibration device. It showed that the material defect was the important factors of ultrasonic “soften” mechanism and obtained the crack extension mechanism under ultrasonic fatigue loading, there were：(1)The high frequency vibration of the ultrasonic fatigue loading weakened the influence of the plastic zone of the crack tip and residual stress on crack extension; (2)When the fatigue crack extension, the ultrasonic wave spread in the specimen, and reflected in the crack surface, resulting the crack closure effect decreased, the plastic zone of the crack tip decreasing; (3)The high vibration frequency and deformation velocity resulted the increase of the thermal effect, crack extension energy spread to the continuous medium in the form of heat, promoting crack extension and releasing energy. It also study the influence of different groove depth and groove curvature on the material ultrasound fatigue limit, and obtained the relation curve of fatigue limit with groove depth and groove curvature.

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Periodical:

Advanced Materials Research (Volumes 538-541)

Pages:

1751-1754

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.538-541.1751

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Online since:

June 2012

Authors:

Xue Li Cheng, Chang Liu Tian

Keywords:

Crack Extension, Fatigue Loading, Ultrasonic Vibration, Uniaxial Tension

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References

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