巻号一覧
48 巻 (2010)
- 6 号 p. 303-
- 5 号 p. 252-
- 4 号 p. 184-
- 3 号 p. 114-
- 2 号 p. 61-
- 1 号 p. 4-
前身誌
48 巻, 5 号
選択された号の論文の4件中1～4を表示しています
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論文
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吉田 聖一原稿種別: 論文
2010 年 48 巻 5 号 p. 252-263
発行日: 2010/09/25
公開日: 2010/12/03
ジャーナル フリーThe floating roofs are used in large aboveground oil storage tanks to prevent evaporation of the content. The single-deck floating roofs, which are considered herein, consists of a thin circular plate called a deck attached to a buoyant ring of box-shaped cross section called a pontoon. Under the accumulated rain water condition, the deck is deflected largely, and both its edge part and the pontoon are compressed circumferentially. Since the load condition due to the rain water depends on the deflected deck shape, it is difficult to find the unique equilibrium condition. This paper describes the deformation analysis for the single-deck floating roofs under the accumulated rain water condition using the axisymmetric shell finite element method. The load incremental method, in which the equivalent nodal forces due to the rain water converges to identify to the rain water load derived from the deflected deck shape, is used.抄録全体を表示PDF形式でダウンロード (1695K) -
吉田 聖一原稿種別: 論文
2010 年 48 巻 5 号 p. 264-275
発行日: 2010/09/25
公開日: 2010/12/03
ジャーナル フリーThe floating roofs are used in aboveground oil storage tanks to prevent evaporation of the content. The single-deck floating roof consists of a thin circular plate called a deck attached to a buoyant ring of box-shaped cross section called a pontoon. In large diameter tanks, a center pontoon may be attached on the center of deck plate of the single-deck floating roof. The center pontoon is a small cylinder with cone roof, and is considered to reduce the risk of pontoon buckling under the accumulated rain water condition. This paper describes the deformation analysis of the single-deck floating roofs with center pontoon under the accumulated rain water condition using the axisymmetric shell finite element method. The load incremental method, in which the equivalent nodal forces due to the rain water converges to identify to the rain water load derived from the deflected deck shape, is used.抄録全体を表示PDF形式でダウンロード (1931K) -
國吉 和男, 真壁 朝敏, 藤川 正毅, 篠原 大作原稿種別: 論文
2010 年 48 巻 5 号 p. 276-282
発行日: 2010/09/25
公開日: 2010/12/03
ジャーナル フリーTo make fine grain material by plastic working is one of the methods for improvement of material strength. In this study, from the viewpoint of basic plastic working, the variations of static ultimate tensile strength and fatigue strength after the application of plastic torsional deformation on pure copper were investigated. Tensile test, Vickers hardness test and Rotating bending fatigue test were performed. The hardness of the materials varied from surface layer to center section in cross sectional area. The tensile strength was improved after applying torsional deformation. However, the fatigue strength was not improved. This is strongly related to hardness distribution around the surface layer of the specimen. Thus, the plastic softening was occurred in surface layer when the very fine grain was created by torsional deformation.抄録全体を表示PDF形式でダウンロード (913K) -
三村 宏原稿種別: 論文
2010 年 48 巻 5 号 p. 283-290
発行日: 2010/09/25
公開日: 2010/12/03
ジャーナル フリーExperimental data on the fatigue fracture toughness test cited from two papers are shown to be well explained on the basis of the Beremin model. It is suggested that estimation for fracture probability of structures should be made by taking into account fatigue propagation path length, and that fatigue fracture toughness test might give a useful means to study the fracture probability in the low fracture toughness and low fracture probability region.抄録全体を表示PDF形式でダウンロード (103K)
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