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Yoshiyasu Morita

Bio: Yoshiyasu Morita is an academic researcher. The author has contributed to research in topics: Detent & Axle. The author has an hindex of 2, co-authored 5 publications receiving 11 citations.
Topics: Detent, Axle, Fatigue limit, Tread, Thermal conduction

Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors calculate the stresses of a wheel with the finite element method and establish a general calculation method for the wheel's stresses, and the results of calculation show good agreement with experiments.
Abstract: Reactions between the wheel and the rail have a great effect on the strength of the railroad wheel. These forces comprise a vertical force acting on the tread of wheel and a lateral force onto the flange, and they induce high stresses on the wheel disc. Those stresses fluctuate in accordance with the rotation of wheel and cause principally the fatigue of wheel disc. However, it is usually very difficult to analyze those stresses exactly because of the specific intricate contour of wheel. the authors then calculate the stresses with the finite element method, and try to establish a general calculation method for stresses of the wheel. Results of calculation show good agreement with experiments.

5 citations

Journal ArticleDOI
TL;DR: In this article, the Naghdi's equations for the torispherical head of pressure vessels are treated by means of the numerical method, which is developed by W. K. Sepetoski and others, and the effect of transverse shear deformation for the problem mentioned above is elucidated.
Abstract: The Naghdi's basic differential equations for the general axially symmetric shell, which include the effect of transverse shear deformation, have not hitherto been solved numerically for some definite shell problems. In this paper, the Naghdi's equations for the problem of the torispherical head of pressure vessels are treated by means of the numerical method, which is developed by W. K. Sepetoski and others, and the effect of transverse shear deformation for the problem mentioned above is elucidated.

2 citations

Journal ArticleDOI
TL;DR: In this article, the temperature distributions in the rim were calculated approximately as a problem of the linear heat conduction through a semi-infinite plate with a line heat source, and the thermal stresses in the wheel disc corresponding to the temperature distribution were analyzed, based on the shell theory.
Abstract: When the tread brake is applied to the conventional railroad wheel, the temperature in the rim rises and a thermal expansion of the rim occurs. Since this expansion of the rim causes a redial tensile force to act on the wheel disc, it is necessary to know how the force affects the strength of the wheel. In this paper, the temperature distributions in the rim were calculated approximately as a problem of the linear heat conduction through a semi-infinite plate with a line heat source, and the thermal stresses in the wheel disc corresponding to the temperature distributions were analysed, based on the shell theory. On the other hand, brake tests on the actual wheel were conducted on a brake testing bench, and the theoretical results were compared with the experimental values.

1 citations


Cited by
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Journal ArticleDOI
Dongfang Zeng1, Yuanbin Zhang1, L. Lu1, Lang Zou1, Shengyang Zhu1 
TL;DR: In this article, a finite element model for the prediction of fretting fatigue crack initiation in the full-scale railway axle was proposed, which took into account the influence of the stress redistribution due to fretting wear on the fatigue.

35 citations

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TL;DR: In this paper, the natural vibrations of railway wheels made of composite materials have been theoretically estimated by the finite element method and compared with those in wheels made by steel, and a conical shell element with displacements in the axial, radial and circumferential directions has been used in the analysis.

4 citations

Journal ArticleDOI
TL;DR: In this paper, the use of metal matrix composites in railway wheel applications is explored and the static and dynamic analysis of railroad wheels made of metal matrices is made using the finite element method.

4 citations

Journal ArticleDOI
TL;DR: The applicability of the following four design formulas of the single-ply unreinforced U-shaped bellows is examined: (1) Kellogg`s formula, (2) formula of EJMA, (3) formula by Hamada and Takezono, (4) formula as presented in this article.
Abstract: The applicability of the following four design formulas of the single-ply unreinforced U-shaped bellows is examined: (1) Kellogg`s formula, (2) formula of EJMA, (3) formula by Hamada and Takezono, (4) formula by Hamada et al. Examination is carried out by comparing results of the design stress and the fatigue life estimated by these four formulas with each other and with experimental data.

3 citations

Journal ArticleDOI
TL;DR: In this article, a comparison of results obtained from two elements based on a thin and a thick shell theory have been made, and it is found that the stresses predicted by the thick shells theory are slightly higher than those predicted by thin shells theory.

3 citations