著者

安藤 孝弘 田中 義照 佐久間 正明 遠藤 久芳 Takahiro ANDO Yoshiteru TANAKA Masaaki SAKUMA Hisayoshi ENDO 国土交通省船舶技術研究所構造強度部 国土交通省船舶技術研究所機関動力部 国土交通省船舶技術研究所構造強度部 国土交通省船舶技術研究所構造強度部

雑誌

船舶技術研究所総合報告資料

巻号頁・発行日

vol.平成12年度, pp.85-112, 2001-03-31 (Released:2017-04-14)

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Recently, the extensive use of high-tensile steel for ship hull structures has realized the decrease of plate thickness, under the design condition that no members yield for the design loads. However, the post buckling design as well as air planes is required to aim at the further making the most of high-tensile strength. This study had been performed as a designated study of Ship Research Institute for three years, in order to investigate the applicability of the post buckling design for ship structures assembled by welding. The details are as follows: ・Investigation of buckling analysis methods of panel or stiffened panel ・Model tests and numerical analysis of stiffened panel ・fatigue tests of stiffened panel subjected to pulsating compressive and shear load ・Investigation of the applicability of the post buckling design for ship structures

著者

佐久間 正明

出版者

Tohoku University

巻号頁・発行日

2017-03-24

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課程

著者

前中 浩 佐久間 正明 松岡 一祥

出版者

社団法人溶接学会

雑誌

溶接学会論文集 : quarterly journal of the Japan Welding Society (ISSN:02884771)

巻号頁・発行日

vol.4, no.1, pp.95-101, 1986-02-05

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The stress relief phenomena in pre-loading on butt welded plates and the changes of material properties owing to the pre-loading were investigated theoretically and experimentally. A over-matching welded joint composed of a 50 kgf/mm^2 class weld metal by automatic CO_2 welding and a mild steel of 16 mm thickness was tested. The strain distributions measured by strain gages showed the same tendency to those calculated by FEM, under pre-loadings in directions perpendicular and parallel to the weld line. The perpendicular loading was superior to the parallel loading in terms of reducing the plastic strains caused of the stress releaving. Strain aging embrittlement of weld metal, HAZ and base metal obtained by 2 mm V notched Charpy test was quite proportional to prestrain, and significant difference among them could not be found. The equations for estimation of the brittle fracture initiation temperature were checked. The rise in the temperature caused by the pre-loading was less than that due to the weld residual stress. It was concluded that the effective pre-loading method recommended in the present paper was sufficiently safe.

著者

前中 浩 佐久間 正明 松岡 一祥

出版者

JAPAN WELDING SOCIETY

雑誌

溶接学会論文集 (ISSN:02884771)

巻号頁・発行日

vol.4, no.1, pp.95-101, 1986

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The stress relief phenomena in pre-loading on butt welded plates and the changes of material properties owing to the pre-loading were investigated theoretically and experimentally. A over-matching welded joint composed of a 50kgf/mm<SUP>2</SUP> class weld metal by automatic CO<SUB>2</SUB> welding and a mild steel of 16 mm thickness was tested.<BR>The strain distributions measured by strain gages showed the same tendency to those calculated by FEM, under pre-loadings in directions perpendicular and parallel to the weld line. The perpendicular loading was superior to the parallel loading in terms of reducing the plastic strains caused of the stress releaving.<BR>Strain aging embrittlement of weld metal, HAZ and base metal obtained by 2 mm V notched Charpy test was quite proportional to prestrain, and significant difference among them could not be found. The equations for estimation of the brittle fracture initiation temperature were checked. The rise in the temperature caused by the pre-loading was less than that due to the weld residual stress. It was concluded that the effective pre-loading method recommended in the present paper was sufficiently safe.