隅を圓めた長方形孔を有する板の周邊應力に就て
スポンサーリンク
概要
- 論文の詳細を見る
Applying the elliptic-hypotrochoidal co-ordinates recently introduced by Prof. Y. Watanabe, the author investigated the stress distribution in a plate, or in a deep beam having an elliptic-hypotrochoidal hole (representing such as hatchway, deck-opening, cargo-port etc.), small enough in comparison with the size of the plate or the beam, under (1) uniform tension, (2) simple shear and (3) simple bending, respectively. Although the decisive conclnsion should be retained owing to the lack of experimental verifieations, the author states the augumentation of the stresses in the following degree in the presence of the hole in a plate or a beam. For a plate or a beam having a rectangular hole with moderately rounded corners, and with the ratio of the breadth to the length of the hole being 2〜0.4. a) When it is subjected to a uniform tension T parallel to one side of the hole, the max pull stress occurs in the neighbourhood of corners and amounts to 3.5〜3 times the mean pull stress at the vicinity clear of the hole. The values of pull stresses at the mid-point of the sides parallel to the pull direction, are about 2.3〜1.2T. Whatever the form of corner-rounding may be, the more the hole lengthens in the pull direction, the more the stress will diminish. b) When it is subjected to a shearing stress S, parallel to one side of the hole, the max. tension or the max. compression occurs at the vicinity of corners of the plate, as in the case (a), and is of the value of 8 S thereabout. The more the hole tends to a square shape rather than a rectangular one, the more the max. stress will diminish. c) When a deep beam having such a hole in the web, as its edges being parallel to the axis of beam, is subjected to a uniform bending, the stress at the mid-point of the edge of the hole amounts to 1〜1.5 <ββ>^^^-_0,where <ββ>^^^⌒_0 is the bending stress at the same point of the intact beam, and as the hole lengthens in the direction of the neutral axis of beam, the stress will diminish. When the edge of a hole is inclined and its centre lies out of the neutral axis of a beam, the calculation may be somewhat complicated, but it can be carried out in a similar manner. It is also observed that the general expressions (7). After slight modifications. may be applied to the cylindrical or anticastic bending of a plate having especially a circular hole or an elliptic one.
- 社団法人日本船舶海洋工学会の論文
- 1934-11-20
著者
関連論文
- 推進器逆轉による船の惰性前進距離竝に時間の計算式に就て
- 各種の斷面型を有する直〓周りの絶對流跡に就て
- On Launching a Glider by Means of Rubber Cords
- 隅を圓めた長方形孔を有する板の周邊應力に就て
- BOUNCING AND SHOCK LOAD OF AN AEROPLANE IN LANDING