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On the Yield Point of Mild Steel
https://jaxa.repo.nii.ac.jp/records/35336
https://jaxa.repo.nii.ac.jp/records/35336d8cbf5b2-e939-49f7-a7e9-98e85a65a1f3
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
SA4146512.pdf (2.4 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||
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| 公開日 | 2015-03-26 | |||||||
| タイトル | ||||||||
| タイトル | On the Yield Point of Mild Steel | |||||||
| 言語 | en | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||
| 資源タイプ | departmental bulletin paper | |||||||
| 著者 |
NAKANISHI, Fujio
× NAKANISHI, Fujio
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| 出版者 | ||||||||
| 出版者 | 東京帝國大學航空研究所 | |||||||
| 出版者（英） | ||||||||
| 出版者 | Aeronautical Research Institute, Tokyo Imperial University | |||||||
| 書誌情報 |
東京帝國大學航空研究所報告 en : Report of Aeronautical Research Institute, Tokyo Imperial University 巻 6, 号 72, p. 83-140, 発行日 1931-06 |
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| 抄録（英） | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | Various theories concerning the elastic limit have been advanced, but none of them can account for the yielding of mild steel. The object of this paper is to propose a new theory. The author considers that the yielding of material is a problem of stability, analogous to the critical point of viscous flow through a pipe. The material will yield when the state of stress becomes unstable; all the stress distribution in the body must therefore have effect on the yield point. When a specimen yields under tension, there exist, during the yielding of the specimen, two portions, yielded and not yet yielded; the strain in the yielded portion is constant for the material and is very large compared with that in the portion not yet yielded. When some part in the body yields, the strain of this part shifts suddenly from the elastic strain to the yielded strain. The average strain of the specimen increases as such yielded parts increase. In like manner, when a cylinder yields under torsion, a thin part between some two cross-sections yields at first, and the yielding spreads all over the cross-section. Then such parts come out in succession; thus the twisting moment remains constant during the yielding of the whole length. This fact confirms the author's idea. Moreover, it has been shown by torsion tests of hollow cylinders that the stresses at yield points are not constant. Such a way of yielding cannot be accounted for by any of the theories hitherto advanced. Before the yielded portion is strained further, the adjacent portion not yet yielded will begin to yield; hence the stress will be constant where two portions, yielded and not yet yielded, coexist. At the end of the horizontal part of the twisting-moment-twisted-angle diagram the two portions exist in the inner part of the specimen, so in that state the stress may be considered to be uniform. From this fact we have, M_y=τ_yK, where My is the twisting moment at the yield point of a solid or hollow cylinder, τy the shearing stress definite for the material, and K the moment of area of the cross-section about the axis. The same relation can be derived from the fact that, at the yield point of a cylinder, the yielding has the tendency to spread throughout the cross-section when a very small part of it begins to yield. The yield point of prisms under torsion can be obtained in the same manner if we take the value of K properly. The yield points of beams of symmetrical cross-section under uniform bending can also be obtained similarly, viz., M_y=σ_yK, where My is the bending moment at the yield point, σ_y the tensile stress definite for the material, and K the moment of area of the cross-section about the neutral axis. By the author's theory, σ_y=2τ_y. All these relations were confirmed by experiments. | |||||||
| 書誌レコードID | ||||||||
| 収録物識別子タイプ | NCID | |||||||
| 収録物識別子 | AA00387631 | |||||||
| 資料番号 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 資料番号: SA4146512000 | |||||||
