Fatigue Damage Evaluation of Shot Peened High Strength Aluminum Alloy

Oshida, Yoshiki; Daly, J. J.

doi:10.1007/978-94-009-0773-7_42

Cited by 9 publications

(5 citation statements)

References 13 publications

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“…As a result, such treated surfaces exhibit higher surface energy, indicating higher surface chemical and physical activities, and enhancing fatigue strength as well as fatigue life due to compressive residual stress [114]. …”

Section: Surface Texturingmentioning

confidence: 99%

“…Sand-blasting, as well as shot-peening (which will be discussed in the following section), has three purposes: (1) cleaning surface contaminants prior to further operation, (2) roughening surfaces to increase effective surface area (for example, under some circumstances, the effective surface area could be double than the original surface area), and (3) producing beneficial surface compressive residual stress [ 114 ]. As a result, such treated surfaces exhibit higher surface energy, indicating higher surface chemical and physical activities, and enhancing fatigue strength as well as fatigue life due to compressive residual stress [ 114 ].…”

Section: Surface Texturingmentioning

confidence: 99%

See 1 more Smart Citation

Dental Implant Systems

Oshida

Tuna

Aktören

et al. 2010

IJMS

174

115

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Among various dental materials and their successful applications, a dental implant is a good example of the integrated system of science and technology involved in multiple disciplines including surface chemistry and physics, biomechanics, from macro-scale to nano-scale manufacturing technologies and surface engineering. As many other dental materials and devices, there are crucial requirements taken upon on dental implants systems, since surface of dental implants is directly in contact with vital hard/soft tissue and is subjected to chemical as well as mechanical bio-environments. Such requirements should, at least, include biological compatibility, mechanical compatibility, and morphological compatibility to surrounding vital tissues. In this review, based on carefully selected about 500 published articles, these requirements plus MRI compatibility are firstly reviewed, followed by surface texturing methods in details. Normally dental implants are placed to lost tooth/teeth location(s) in adult patients whose skeleton and bony growth have already completed. However, there are some controversial issues for placing dental implants in growing patients. This point has been, in most of dental articles, overlooked. This review, therefore, throws a deliberate sight on this point. Concluding this review, we are proposing a novel implant system that integrates materials science and up-dated surface technology to improve dental implant systems exhibiting bio- and mechano-functionalities.

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Section: Surface Texturingmentioning

confidence: 99%

Section: Surface Texturingmentioning

confidence: 99%

Dental Implant Systems

Oshida

Tuna

Aktören

et al. 2010

IJMS

174

115

View full text Add to dashboard Cite

show abstract

“…It is well documented that shot-peening has been employed as an effective way to improve characteristics, especially in terms of improved fatigue behaviour and/or corrosion resistance of metallic materials [2]. This improvement is recognized as enhanced fatigue strength or reduced fatigue crack growth, and also retardation in the susceptibility to stress corrosion cracking [3,41.…”

Section: Introductionmentioning

confidence: 99%

“…This improvement is recognized as enhanced fatigue strength or reduced fatigue crack growth, and also retardation in the susceptibility to stress corrosion cracking [3,41. Because only the surface layer is plastically deformed by shot-peening and the bulk material remains undeformed, this inhomogeneous deformation induces compressive residual macrostresses in a relatively thin surface laYer [2]. Because residual stresses act as if they are mean stresses in the fatigue cycling process, compressive residual stress developed at the surface layers reduces the mean stress in the surface layer, resulting in the retardation of the initiation of early fatigue crack growth [2, 53. Research in the biomedical applications of shotpeening has been limited.…”

Section: Introductionmentioning

confidence: 99%

Effects of shot-peening on surface contact angles of biomaterials

Oshida

Sachdeva

Miyazaki

et al. 1993

J Mater Sci: Mater Med

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It was shown previously that (i) if the surface of a biomaterial is covered with TiO2 (tetragonal structure oxide), it shows a high initial contact angle and a high change rate in contact angle (i.e. a higher spreading process); while (ii) cubic structure oxides show relatively lower spreading rates in 1% NaCI solution at 25 °C. Shot-peening has been applied to biomaterials (especially titanium and its alloys) to improve their fatigue strength. It is well known that shot-peening causes surface roughening. The effects of surface roughness on wettability are not well documented. Therefore, in the present study, the effects of shot peening on the initial contact angle and changes in it as a function of time, were investigated. In addition, the spontaneous half-cell potential of all tested biomaterials were measured to correlate the wettability phenomenon to initial surface chemistry. Pure titanium and its alloys, including Ti-6AI-4V and NiTi alloys, AISI Type 316L stainless, Co-Cr alloy, and pure nickel, were mechanically polished, shot-peened and pre-oxidized at 300 °C for 30 min in pure oxygen. It was found that (i) shot-peening homogenized the surface conditions in terms of initial contact angles, (ii) TiO2 oxide shows a higher spreading coefficient, while cubic structure oxides show a lower value, and (iii) the spreading coefficient was correlated to the magnitude of the spontaneous half-cell potential.

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“…Previous studies [4] indicated that the effect of shot peening on the fatigue characteristics were mainly observed in the high stress region of S-N curves. Oshida [5] pointed out that the compressive residual stress and surface roughness on the fatigue characteristics of aluminum alloys and there was an optimum region to obtain the highest fatigue performance. But, up to now, the compressive residual stress introduced by shot peening and its effect upon fatigue characteristics have not been quantitatively discussed.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Compressive Residual Stress on the Fatigue Characteristics of Al6061

Park

Huh

Lee

et al. 2006

KEM

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Recently, the steel parts used at the aerospace and automobile industries are required to be used high stress more than ever before in need of the weight down. Therefore, used material steel have to be a high stress, which is an indispensable condition in this field. At the consideration of parts design, high hardness of the lightweight parts has an benefit of saving fuel and material. In this study, the surface conditions are measured to know the influence on fatigue properties by shot peening. In this study, the optimum shot peening condition is investigated. Fatigue test was accomplished to investigate the effects of compressive residual stress by shot peening on fatigue characteristics. Test results show the fatigue characteristics were increased by optimum peening condition. But the fatigue characteristics were decreased by under peening or over peening condition.

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Fatigue Damage Evaluation of Shot Peened High Strength Aluminum Alloy

Cited by 9 publications

References 13 publications

Dental Implant Systems

Dental Implant Systems

Effects of shot-peening on surface contact angles of biomaterials

The Effect of Compressive Residual Stress on the Fatigue Characteristics of Al6061

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