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Kunio Nishioka

Bio: Kunio Nishioka is an academic researcher from Sumitomo Metal Industries. The author has contributed to research in topics: Fatigue limit & Fretting. The author has an hindex of 7, co-authored 21 publications receiving 393 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the relation between the frictional force and the relative slip amplitude was investigated experimentally, and the alternating stress amplitude, σfw1, which is the fatigue limit based upon the initation of fatigue cracks under the condition of fretting, could be expressed in the following equation as a function of relative slip.
Abstract: The fact that the fretting fatigue strength is significantly influenced by the relative slip amplitude was confirmed experimentally and reported in the previous paper. In the present paper, in order to make clear why the relative slip has a marked influence upon the fretting fatigue strength, the relation between the frictional force and the relative slip is investigated experimentally. As the result, the alternating stress amplitude, σfw1, which is the fatigue limit based upon the initation of fatigue cracks under the condition of fretting, could be expressed in the following equation as a function of relative slip, S, σfw1=σw1-2μp0{1-exp (-S/κ)}, where σw1 is the fatigue strength of plain specimen, μ is the coefficient of friction, and k is a constant.

106 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the initiation of fatigue cracks in relation to the contact stresses caused by fretting and found that the reduction of fatigue strength is mainly attributed to the stress concentration caused by the frictional force due to fretting.
Abstract: It has been known that the fatigue strength related to fretting is significantly reduced and that non-propagating fatigue cracks are often observed in the superficial layer of fretted area. In order to clarify the causes of such phenomena, the initiation of fatigue cracks is investigated in relation to the contact stresses caused by fretting. The main results obtained are as follows. (1) The reduction of fatigue strength is mainly attributed to the stress concentration caused by the frictional force due to fretting. Fatigue cracks are located at the stress concentrated area. (2) The fatigue cracks show inclinations to the surface, and the direction can also be explained by the contact stresses.

71 citations

Journal ArticleDOI
TL;DR: In this paper, the construction and features of a fretting fatigue testing machine designed by the authors are explained, and the experimental results obtained by using the testing machine are stated concerning mainly the relative slip which is considered to be one of the most significant factors affecting the fatigue strength.
Abstract: In the present paper, the construction and features of a fretting fatigue testing machine designed by the authors are explained, and the experimental results obtained by using the testing machine are stated concerning mainly the relative slip which is considered to be one of the most significant factors affecting the fretting fatigue strength. The following are known from this investigation. In fretting fatigue, many shallow micro-cracks which seem not to propagate to a complete fracture are formed and develop somewhat obliquely from the surface of specimen because of the effect of frictional force due to fretting. Fatigue strength is reduced significantly by the effect of fretting, and the strength reduction factors, concerning both nucleation of fatigue cracks and fatigue fracture, are greatly influenced by the magnitudes of relative slips. The fatigue strength is most significantly reduced when the relative slips are about 0.015∼0.020 mm, and reduced to less than 1/5 of its strength without fretting, and if the relative slips could be kept less than 0.005 mm, a marked improvement would be expected.

65 citations

Journal ArticleDOI
TL;DR: Fretting fatigue tests have been made about the effect of clamping pressure, p0, and hardness of materials on the initiation of non-propagating cracks and also complete fracture under the conditions where the relative slip is fully controlled.
Abstract: Fretting fatigue tests have been made about the effect of clamping pressure, p0, and hardness of materials on the initiation of non-propagating cracks and also complete fracture under the conditions where the relative slip is fully controlled. The main results obtained are as follows. (1) Fretting fatigue strength based on the initiation of fatigue cracks, σw1, decreases linearly with the increase of p0. (2) Fretting fatigue strength based on fracture, σw2, decreases gradually with the increase of contact pressure, and reaches a critical strength when p0 is beyond a certain value. (3) These results in (1) and (2) are analogous to fatigue phenomena of notched specimens, when the stress concentration caused by fretting is considered. (4) When the relative slip of fretting is relatively large, σw1 is affected by the susceptibility of materials to wear.

54 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of mean stresses on the initiation of minute fatigue cracks in superficial layer and on their propagation to complete fracture, under controlled conditions of fretting slip amplitude, are investigated using the fretting fatigue testing machine described in the previous paper.
Abstract: A series of investigations is proceeding to clarify the phenomena of fretting fatigue. In the present paper, the effects of mean stresses on the initiation of minute fatigue cracks in superficial layer and on their propagation to complete fracture, under controlled conditions of fretting slip amplitude, are investigated using the fretting fatigue testing machine described in the previous paper. Annealed specimens and induction hardened specimens made of carbon steel are employed in the experiment. The following are the main results obtained. (1) The range of alternating stress amplitude at which no fatigue cracks initiate is not affected by the mean stresses, but is a constant value depending on the materials. The fatigue limit can be raised by induction hardening. (2) A fatigue limit against propagation of minute cracks (maximum alternating stress amplitude at which the minute fatigue cracks do not propagate) is cosiderably affected by the mean stresses, and it decreases with the increase of mean stress.

48 citations


Cited by
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Journal ArticleDOI
01 Sep 1988-Wear
TL;DR: In this article, three different regimes of fretting are distinguished using dynamic tangential force and displacement measurements and the corresponding modes of surface damage can be identified from post-test metallographic examination.

756 citations

Journal ArticleDOI
01 Oct 1996-Wear
TL;DR: In this paper, a closed-form solution for the 2D elastic stress field is adapted for reduced loading configurations modeled in a recently constructed fretting fatigue experiment that applies loads relevant to aircraft lap joints.

402 citations

Journal ArticleDOI
01 Oct 1998-Wear
TL;DR: In this article, a multiaxial fatigue analysis based on the stress-strain cycle experienced by each point of the bodies subjected to the fretting loads reveals that the critical location for crack formation is the trailing edge of contact, consistent with observations made in the laboratory.

228 citations

Journal ArticleDOI
TL;DR: A review of recent developments in the area of fretting fatigue can be found in this article, where the importance of the size effect is highlighted and an analogy is made between fretting and notch fatigue.

220 citations

Journal ArticleDOI
01 Jun 1970-Wear
TL;DR: In this article, the authors brought up-to-date the known facts concerning the mechanism of fretting wear in metals with special reference to the common engineering materials iron and steel under normal conditions.

204 citations