Theoretical and experimental investigations of ultrasonic sound fields in thin bubbly liquid layers for ultrasonic cavitation peening

Bai, Fushi; Long, Yangyang; Saalbach, Kai-Alexander; Twiefel, Jens

doi:10.1016/j.ultras.2018.11.010

Cited by 19 publications

(11 citation statements)

References 26 publications

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“…A vibratory horn is placed close to the surface of the material to be treated. It was found that at submillmeter horn to target distances the aggressive intensity changed drastically [21], and this was confirmed experimentally and theoretically by Bai et al [22]. As the sensitivity to distance of ultrasonic cavitation limits its applications, it was not examined in this paper, and only cavitation induced by a submerged water jet and using a submerged pulsed laser were investigated.…”

Section: Introductionmentioning

confidence: 69%

Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel

Soyama

2019

Metals

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The traditional technique used to modify the surface of a metallic material is shot peening; however, cavitation peening, a more recent technique in which shot is not used, was developed, and improvements in the fatigue strength of metallic materials were demonstrated. In order to compare the fatigue properties introduced by shot peening with those introduced by cavitation peening, crack initiation and crack growth in specimens of austenitic stainless steel (Japanese Industrial Standards JIS SUS316L) treated using these techniques were investigated. With conventional cavitation peening, cavitation is produced by injecting a high speed water jet into water. In the case of submerged laser peening, bubbles are generated using a pulsed laser after laser ablation, and the impact produced when the bubbles collapse is larger than that due to laser ablation. Thus, in this study, cavitation peening using a water jet and submerged laser peening were investigated. To clarify the mechanisms whereby the fatigue strength is improved by these peening techniques, crack initiation and crack growth in specimens with and without treatment were examined by means of a K-decreasing test, where K is the stress intensity factor, and using a constant applied stress test using a load controlled plane bending fatigue tester. It was found that the improvement in crack initiation and the reduction in crack growth were roughly in a linear relationship, even though the specimens were treated using different peening methods. The results presented here show that the fatigue strength of SUS316L treated by these peening techniques is closely related to the reduction in crack growth, rather than crack initiation.

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Section: Introductionmentioning

confidence: 69%

Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel

Soyama

2019

Metals

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“…During ultrasonic cavitation peening, the vibratory horn is placed to the target surface at a certain distance from the target. The aggressive intensity of ultrasonic cavitation drastically changes with the distance from the target [70], which was confirmed both experimentally and theoretically [75]. Unfortunately, the sensitivity of aggressive intensity to the distance using ultrasonic cavitation limits the practical applications.…”

Section: Ultrasonic Cavitationmentioning

confidence: 60%

Cavitation Peening: A Review

Soyama

2020

Metals

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The most popular surface modification technology used to enhance the mechanical properties of metallic materials is shot peening. Shot peening improves fatigue life and strength by introducing local plastic deformation pits. However, the pits increase surface roughness, which is a disadvantage for fatigue properties. Recently, cavitation peening, in which cavitation bubble collapse impacts are used, has been developed as an advanced surface modification technology. The advantage of cavitation peening is the lesser increase in surface roughness compared with shot peening, as no solid collisions occur in cavitation peening. In conventional cavitation peening, cavitation is generated by injecting a high-speed water jet into water. However, cavitation peening is different from water jet peening, in which water column impacts are used. In the present review, to avoid confusing cavitation peening and water jet peening, fundamentals and mechanisms of cavitation peening are described in comparison to water jet peening, and the effects and applications of cavitation peening are reviewed compared with the other peening methods.

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“…When taking the sound interaction among bubbles in vibratory test into account, 14 the theoretical model used to describe bubble’s evolution process is a coupled Keller–Miksis equation, which reads where, R i = R i ( t ) and R j = R j ( t ) are the time-dependent radius of bubble i and bubble j , r ij is the distance between the centers of bubbles i and j , N is the number of bubbles, ρ is the density of water, t is the time, c is the speed of the sound in the water, d / dt denotes the time derivative, and P is a local water pressure in the flow field of the vibratory test rig where R 0 is the initial radius of the bubble, γ is the adiabatic index, μ is the viscosity of the water, σ is the surface tension constant of the water, P sta the static pressure, P w is an external pressure applied at the bubble wall. In the case of a single frequency ultrasonic excitation of the bubble, it can be written in the form 23 where f is the frequency of sound wave and P a is the acoustic pressure amplitude. According to Bai et al., 23 at 23 kHz, the average acoustic pressure of the center in thin bubbly liquid layers is from 80 × 10 3 Pa to 115 × 10 3 Pa at different driving currents.…”

Section: Dynamic Analysis Of Bubblesmentioning

confidence: 99%

“…In the case of a single frequency ultrasonic excitation of the bubble, it can be written in the form 23 where f is the frequency of sound wave and P a is the acoustic pressure amplitude. According to Bai et al., 23 at 23 kHz, the average acoustic pressure of the center in thin bubbly liquid layers is from 80 × 10 3 Pa to 115 × 10 3 Pa at different driving currents. So a maximal acoustic pressure value of P a = 115 × 10 3 Pa is assumed in our study.…”

Section: Dynamic Analysis Of Bubblesmentioning

confidence: 99%

Bubble–bubble interaction effects on multiple bubbles dynamics in an ultrasonic cavitation field

Cheng

Zhao

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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A vibratory erosion test rig is used to study the cavitation erosion of 6061 alloy. Some craters and material fracture are found on the specimen surface at the beginning of test. A cavitation model in an ultrasonic field is developed by applying the bubble–bubble interaction effect into Keller–Miksis equation to obtain the bubbles dynamic characteristics. The results reveal that the bubble cloud configuration is suitable for the explanation of cavitation erosion, and the erosion surfaces of the specimen were subjected to the effect of both massive bubbles collapsing, occurring in the thin liquid layer between the horn and the specimen. It is concluded that the optimal coupling strength of bubbles increases with the decrease of the bubble initial radius, and stable cavitation only occurs when the acoustic pressure amplitude is higher than a threshold value, which can well predict the experimental results.

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Theoretical and experimental investigations of ultrasonic sound fields in thin bubbly liquid layers for ultrasonic cavitation peening

Cited by 19 publications

References 26 publications

Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel

Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel

Cavitation Peening: A Review

Bubble–bubble interaction effects on multiple bubbles dynamics in an ultrasonic cavitation field

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