Improving the fatigue strength of the elements of a steel belt for CVT by cavitation shotless peening

Soyama, Hitoshi; Shimizu, Masanori; Hattori, Yuji; Nagasawa, Yuji

doi:10.1007/s10853-008-2743-6

Cited by 41 publications

(24 citation statements)

References 10 publications

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“…Cavitation clouds shed periodically from the nozzle and spread out across the surface being treated, and when the bubbles collapse they produce impacts which can deform the material [10]. A cavitating jet can be used to treat surfaces set parallel to the jet axis [11] and also introduce compressive residual stress at depth beneath the surface [12]. Thus, it may be possible to use such a jet to treat the surfaces of the walls of fastener holes.…”

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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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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“…However, cavitation impact can also be utilized to improve the surface in the same way as shot peening. [1][2][3][4][5][6][7][8][9][10] As shot are not required, the peening method using cavitation impact is called "cavitation shotless peening" [11][12][13][14][15][16][17][18][19] or simply "cavitation peening". 20) One of the major advantages of cavitation shotless peening is that the peened surface is very smooth compared with a shot peened one, as there are no collisions between solid materials.…”

Section: Introductionmentioning

confidence: 99%

“…Cavitation shotless peening can introduce compressive residual stress to mitigate stress corrosion cracking or to eliminate fretting fatigue, 8,12,14) and enhance the fatigue strength of metallic materials. 11,13,[15][16][17][18][19] In order to develop cavitation shotless peening for practical applications, it is very important to enhance the cavitation impact to achieve better results and shorten the processing time.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of the Fatigue Strength of Stainless Steel SUS316L by a Cavitating Jet with an Associated Water Jet in Water

2008

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Cavitation impact induced by a cavitating jet can be utilized to improve fatigue strength in the same way as shot peening. The peening method using cavitation impact is known as "cavitation shotless peening", as shot are not required. For practical purposes, enhancement of the cavitation impact is required in order to get a better peening effect and to shorten the processing time. In the present paper, intensification of the cavitation impact was successfully realized by injecting a low-speed water jet around a cavitating jet in water, and an improvement in the fatigue strength of stainless steel was demonstrated by subjecting treated materials to a fatigue test. The fatigue strength of stainless steel was improved by about 28 % by cavitation shotless peening compared with a non-peened specimen. In order to clarify the mechanism for surface enhancement by cavitation shotless peening, the residual stress on the surface was measured using an X-ray diffraction method. It was shown that cavitation shotless peening using a cavitating jet with an associated low-speed water jet in water introduced compressive residual stress on the surface of the steel. Interestingly, it was also found that the full width at half maximum of the X-ray diffraction profile from the surface decreased, even though compressive residual stress of about 500 MPa had been introduced by the cavitation shotless peening.

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“…Secondly, cavitation peening does not require the chemical cleaning which is needed to remove iron adhering to the surface when shot peening is applied, since cavitation peening uses only water. Thirdly, cavitation peening can be used to treat surfaces in narrow spaces where shot cannot reach, e.g., fastener holes in aircraft components [13], the bottoms of gears [14] or elements of the steel belts used for Continuously Variable Transmission (CVT) [15].…”

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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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Improving the fatigue strength of the elements of a steel belt for CVT by cavitation shotless peening

Cited by 41 publications

References 10 publications

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

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

Improvement of the Fatigue Strength of Stainless Steel SUS316L by a Cavitating Jet with an Associated Water Jet in Water

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

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