Corrosion Behavior of Pressure Vessel Steel Exposed to Residual Bubbles After Cavitation Bubble Collapse

Soyama, Hitoshi

doi:10.5006/1.3548733

Cited by 10 publications

(3 citation statements)

References 15 publications

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“…(Soyama et al, 1990). The cavitator produces cavitation bubbles, and these cavitation bubbles become tiny residual bubble after collapsing (Soyama, 2011b). The residual bubbles then function as cavitation nuclei for cavitation bubbles further downstream.…”

Section: Experimental Facilities and Proceduresmentioning

confidence: 99%

Enhancing the aggressive intensity of a cavitating jet by introducing a cavitator and a guide pipe

Soyama

2014

JFST

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In order to enhance the aggressive intensity of a cavitating jet for practical applications, such as cavitation peening, a nozzle equipped with an additional nozzle upstream from the main nozzle, i.e., a cavitator, and a guide pipe downstream from the main nozzle was proposed and optimized. The aggressive intensity of the jet was evaluated by the residual plastic deformation, i.e., the radius of curvature, in duralumin plate specimens subjected to the jet perpendicullary. The radius of curvature can be considered to be directly related to the aggressive intensity of the jet, as the plastic deformation such as introduction of compressive residual stress and/or work hardening in metallic materials is important parameters on cavitation peening. The deformation occurs because the pressure due to cavitation impacts is beyond the yield stress of the specimens. It was demonstrated that a nozzle equipped with an optimized cavitator and optimized guide pipe increased the aggressive intensity of the jet by a factor of 4.2 without an increase of the jet power, compared to the jet obtained with a conventional nozzle with neither cavitator nor guide pipe, as the cavitator fed cavitation nuclei for the jet and the guide pipe enlarged the cavitation clouds of the jet.

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Section: Experimental Facilities and Proceduresmentioning

confidence: 99%

Enhancing the aggressive intensity of a cavitating jet by introducing a cavitator and a guide pipe

Soyama

2014

JFST

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“…In order to avoid suction vortices, a floating plate is placed near the nozzle. After the cavitation bubbles collapse, residual bubbles [19] remaining in the test water are recirculated. These residual bubbles give rise to a cushion effect that reduces the shock wave produced by cavitation bubbles collapsing.…”

Section: Introductionmentioning

confidence: 99%

The Use of Cavitation Peening to Increase the Fatigue Strength of Duralumin Plates Containing Fastener Holes

Soyama

2014

MSA

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An effective method for improving the fatigue life of Duralumin plates with fastener holes, such as those used in the construction of aircraft, is to introduce a compressive residual stress around the fastener holes. Cavitation peening is a novel peening method that uses the cavitation impact produced when a high-speed water jet is injected into a water-filled chamber. In this paper, Duralumin plate specimens with holes were treated by cavitation peening under various conditions, and the fatigue strength of the specimens was determined using a plate bending fatigue test. It was revealed that a compressive residual stress was introduced not only on surfaces perpendicular to the axis of the cavitating jet but also on the walls of holes which were parallel to this. It was found that a 51% improvement in fatigue strength could be achieved by cavitation peening. Note that this is first report demonstrating an improvement in the fatigue life of Duralumin plates with fastener holes by cavitation peening.

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“…The test section is open to the ambient air. As residual bubbles which remain after the cavitation bubbles have collapsed might reduce the shock wave, a partition plate is placed in tank B to remove residual bubbles remaining in the test water [17]. The geometrical parameters of the nozzle are given in Table 1.…”

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confidence: 99%

Using Cavitation Peening to Improve the Fatigue Life of Titanium Alloy Ti-6Al-4V Manufactured by Electron Beam Melting

Sato¹,

Takakuwa²,

Nakai³

et al. 2016

MSA

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Although Electron Beam Melting (EBM) is an innovative technology, the fatigue properties of materials manufactured by EBM may be lower than those of casted and wrought materials due to defects and surface roughness. In order to enhance the fatigue life of components or structures manufactured by EBM, a mechanical surface treatment technology, e.g., peening, would be effective because peening introduces high compressive residual stress at the surface which can extend the fatigue life considerably. In the present study, specimens were manufactured by EBM using titanium alloy Ti-6Al-4V powder. Two types of specimens were prepared: as-built and as-machined specimens. Specimens of each type were treated by cavitation peening or shot peening. The fatigue lives of the specimens were evaluated by a plate bending fatigue tester. The residual stress and surface roughness were also evaluated. The results obtained showed that the fatigue strength of as-built specimens can be improved by 21% by cavitation peening or shot peening, and the fatigue life under particular applied stresses can also be extended by 178% by cavitation peening.

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Corrosion Behavior of Pressure Vessel Steel Exposed to Residual Bubbles After Cavitation Bubble Collapse

Cited by 10 publications

References 15 publications

Enhancing the aggressive intensity of a cavitating jet by introducing a cavitator and a guide pipe

Enhancing the aggressive intensity of a cavitating jet by introducing a cavitator and a guide pipe

The Use of Cavitation Peening to Increase the Fatigue Strength of Duralumin Plates Containing Fastener Holes

Using Cavitation Peening to Improve the Fatigue Life of Titanium Alloy Ti-6Al-4V Manufactured by Electron Beam Melting

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