巻号一覧
28 巻 (1990)
- 6 号 p. 276-
- 5 号 p. 218-
- 4 号 p. 166-
- 3 号 p. 114-
- 2 号 p. 62-
- 1 号 p. 4-
前身誌
28 巻, 2 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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山浦 晃央, 山口 忠政, 志賀 千晃, 上田 修三1990 年 28 巻 2 号 p. 62-70
発行日: 1990/03/25
公開日: 2010/08/05
ジャーナル フリーNarrow gap submerged arc welding consumables for V-modified 21/4 Cr-1 Mo steels are developed through the investigation of effects of V and Nb contents in weld metals on tensile strength, toughness and creep rupture strength of weld metals. Tensile and creep rupture strengths of the weld metals increase with increasing V and Nb contents in the weld metals. However excessive Nb addition up to 0.033% deteriorates toughness of the weld metal. The optimum V and Nb contents in the weld metal to satisfy both creep rupture strength and toughness are 0.2-0.3% and 0.02%, respectively. Coarse precipitates contained Cr, Mo, Fe, and V are observed in the conventional weld metal contained 0.07%V with a transmission electron microscopy. On the other hand, fine precipitates which contained Cr, Mo, Fe, V, and Nb are observed in the newly developed weld metal contained 0.29%V and 0.018%Nb besides the coarse ones. Due to these fine precipitates, a newly developed weld metal shows about 10MPa higher creep rupture strength at 755K for 100, 000h than the conventional one and shows excellent resistance to hydrogen attack.抄録全体を表示PDF形式でダウンロード (2064K) -
臼井 俊央, 景山 昭二, 國重 博史, 田村 英樹, 澤岡 昭1990 年 28 巻 2 号 p. 71-81
発行日: 1990/03/25
公開日: 2010/08/05
ジャーナル フリーUsing the PISCES-2DELK code, the hypervelocity impact phenomena of a spherical projectile of steel or polycrystalline spinel to a 2024-T3 aluminum alloy plate were investigated. Debris cloud characteristics predicted by the hydrocode were compared with experimental results. The impact with velocity of 4km/s produced a debris cloud, consisting mainly of solid and partly of liquid. When the projectile is incompletely shattered to fine particles and the velocity vectors of them are little laterally dispersed, the coarse particles act as a concentrated load on the mainwall. The plastic flow and breakup behaviors of a projectile and a target plate at the initial penetration stage are also discussed using the ratio of internal energy to kinetic energy.抄録全体を表示PDF形式でダウンロード (6594K) -
山内 芳彦1990 年 28 巻 2 号 p. 82-90
発行日: 1990/03/25
公開日: 2010/08/05
ジャーナル フリーOverpressure for a fixed-roof tank dishes the roof, pulling the roof-to-shell junction radially inward and uplifts the bottom plate adjacent to the shell. It usually results in a failure of the fillet weld joining the roof plate to the shell when the stress in the junction reaches the yield point of the material before failure occurs anywhere else in the tank.
E. E. Morgenegg indicated the importance of frangible roof design and apprehended that roofs on tanks smaller than about 15 meters in diameter would not fail as intended although designed by API Standard 650 Appendix F.
So, the author developed the finite element code “CNCL-ND” and showed the nonlinear dynamic behavior of typical fixed-roof tank under impulsive internal pressure. Furthermore, in this paper, the author have developed a joint element for a continuous fillet weld joining the roof plate to the shell termed a “Fillet Weld Element” and define the fracture mechanics parameter Φw. For the shell-to-bottom junction, a simple method is proposed to estimate the stress intensity factor KI* applying the Dugdale-Barenblatt model. By using these parameters, it can be evaluated the reliability of frangible roof design numerically.抄録全体を表示PDF形式でダウンロード (861K) -
田村 広治, 小山 輝夫, 佐藤 恭1990 年 28 巻 2 号 p. 91-97
発行日: 1990/03/25
公開日: 2010/08/05
ジャーナル フリーMaterials of boiler components operated at high temperature and pressure conditions are mainly damaged by creep. Nondestructive creep life assessing techniques of boiler materials based on a metallographical exanimation were studied.
As a result of metallographical exanimation, the MDG (Micro Deformation of Grain) Method was newly developed enabling the evaluation of Cr-Mo base metals which could not have been evaluated. The Cavity Method applying the area fraction of cavities was established for Cr-Mo welds (HAZ and weld metal) and austenitic stainless steels. These methods have been pratically applied to residual life evaluations and life extention programs for boiler components.抄録全体を表示PDF形式でダウンロード (4816K)
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