Peening the tip of a notch using ultrasonic cavitation

•Ultrasonic cavitation was adopted to peen the tips of deep notches.•It was demonstrated that the ultrasonic intensity is concentrated at the notch.•It was visually confirmed that ultrasonic cavitation was intensified at the notch tip.•Ultrasonic cavitation at the notch tip generated compressive res...

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Bibliographic Details
Published in:Ultrasonics 2018-01, Vol.82, p.322-326
Main Authors: Jung, Sunghwan, Prabhu, Murugesan, Lee, Hyungyil
Format: Article
Language:English
Subjects:
Cavitation
Notch
Peening
Tip
Ultrasonic
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Summary:•Ultrasonic cavitation was adopted to peen the tips of deep notches.•It was demonstrated that the ultrasonic intensity is concentrated at the notch.•It was visually confirmed that ultrasonic cavitation was intensified at the notch tip.•Ultrasonic cavitation at the notch tip generated compressive residual stresses. A peening technique using ultrasonic cavitation was proposed to peen the tip of deep notches. The working theory of the present peening technique for the notch tip was described and numerically demonstrated. An experiment using a deep notch shape and an ultrasonic loading with a frequency of 20kHz achieved noticeable compressive residual stresses at the notch tip.
ISSN:0041-624X
1874-9968
DOI:10.1016/j.ultras.2017.09.004