Details
| Original language | English |
|---|---|
| Pages (from-to) | 38-44 |
| Number of pages | 7 |
| Journal | Ultrasonics |
| Volume | 84 |
| Early online date | 13 Oct 2017 |
| Publication status | Published - Mar 2018 |
Abstract
Ultrasonic cavitation peening is a novel surface treatment technology which utilizes the effect of cavitation bubble collapses to improve the properties of metal surfaces. In order to obtain high impact during ultrasonic cavitation peening, a small standoff distance between a sound radiator and a rigid reflector (the surface of treated specimen) is necessary. However, the effects of different standoff distances on the capability of ultrasonic cavitation peening are not yet clear. In this paper, a simplified model was developed to evaluate the cavitation capability at different standoff distances. Meanwhile, to validate the theoretical model, the plastic deformation or erosion on the peening surface before and after treatment were compared. It was found that at a very small standoff distance the impact pressure generated by cavitation bubbles did not cause much deformation or erosion, as the dynamics of cavitation bubbles was limited. At a large standoff distance, due to much attenuation of sound propagation in the bubbly liquid, little impact pressure was generated by the collapse of cavitation bubbles and reached the treated surface. A fixed vibration amplitude, however, corresponded to a standoff distance which caused the largest deformation or erosion on the treated surface.
Keywords
- Cavitation bubbles, Standoff distance, Thin liquid layer, Ultrasonic cavitation peening
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Acoustics and Ultrasonics
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In: Ultrasonics, Vol. 84, 03.2018, p. 38-44.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Capability evaluation of ultrasonic cavitation peening at different standoff distances
AU - Bai, Fushi
AU - Saalbach, Kai Alexander
AU - Long, Yangyang
AU - Twiefel, Jens
AU - Wallaschek, Jörg
N1 - © 2017 Elsevier B.V. All rights reserved.
PY - 2018/3
Y1 - 2018/3
N2 - Ultrasonic cavitation peening is a novel surface treatment technology which utilizes the effect of cavitation bubble collapses to improve the properties of metal surfaces. In order to obtain high impact during ultrasonic cavitation peening, a small standoff distance between a sound radiator and a rigid reflector (the surface of treated specimen) is necessary. However, the effects of different standoff distances on the capability of ultrasonic cavitation peening are not yet clear. In this paper, a simplified model was developed to evaluate the cavitation capability at different standoff distances. Meanwhile, to validate the theoretical model, the plastic deformation or erosion on the peening surface before and after treatment were compared. It was found that at a very small standoff distance the impact pressure generated by cavitation bubbles did not cause much deformation or erosion, as the dynamics of cavitation bubbles was limited. At a large standoff distance, due to much attenuation of sound propagation in the bubbly liquid, little impact pressure was generated by the collapse of cavitation bubbles and reached the treated surface. A fixed vibration amplitude, however, corresponded to a standoff distance which caused the largest deformation or erosion on the treated surface.
AB - Ultrasonic cavitation peening is a novel surface treatment technology which utilizes the effect of cavitation bubble collapses to improve the properties of metal surfaces. In order to obtain high impact during ultrasonic cavitation peening, a small standoff distance between a sound radiator and a rigid reflector (the surface of treated specimen) is necessary. However, the effects of different standoff distances on the capability of ultrasonic cavitation peening are not yet clear. In this paper, a simplified model was developed to evaluate the cavitation capability at different standoff distances. Meanwhile, to validate the theoretical model, the plastic deformation or erosion on the peening surface before and after treatment were compared. It was found that at a very small standoff distance the impact pressure generated by cavitation bubbles did not cause much deformation or erosion, as the dynamics of cavitation bubbles was limited. At a large standoff distance, due to much attenuation of sound propagation in the bubbly liquid, little impact pressure was generated by the collapse of cavitation bubbles and reached the treated surface. A fixed vibration amplitude, however, corresponded to a standoff distance which caused the largest deformation or erosion on the treated surface.
KW - Cavitation bubbles
KW - Standoff distance
KW - Thin liquid layer
KW - Ultrasonic cavitation peening
UR - http://www.scopus.com/inward/record.url?scp=85032865743&partnerID=8YFLogxK
U2 - 10.1016/j.ultras.2017.10.013
DO - 10.1016/j.ultras.2017.10.013
M3 - Article
C2 - 29073486
AN - SCOPUS:85032865743
VL - 84
SP - 38
EP - 44
JO - Ultrasonics
JF - Ultrasonics
SN - 0041-624X
ER -