著者

清水 澄 荒木 睦郎 越賀 房夫

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1961, no.109, pp.417-423, 1961

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The bigger the size of ship becomes, the more complicate questions arise on the hull construction. The gunwale connection in the mammouth ship is one of the most grave questions, because of the poor purchasability of the big size gunwale angles, the hard workmanship on the riveting of large diametres, and etc. As the countermeasures for the above-mentioned questions, the Tee-section or angle built-up by welding, or else the rounded gunwale, were already proposed.<BR>The authors examine the current practices of the gunwale connection in the mammouth ship and propose a new type of welded gunwale, "L-gunwale", as the most promising.

著者

越賀 房夫 田中 甚吉 栗田 義之

出版者

公益社団法人日本船舶海洋工学会

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

no.129, pp.267-276, 1971-06

被引用文献数

2

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Effects of stress-relieving heat treatment on brittle fracture initiation in welded structures are quantitatively discussed in terms or fracture mechanics. The basic concept employed for discussion is that brittle fracture should initiate when tensile yield zone formed ahead of a pre-existing crack attains a critical size depending on the material. The critical zone size as a function of temperature is predictable from Charpy-V transition temperature. Metallurgical information on welding residual stress and Charpy-V data for various conditions of heat treatment is compiled and put into the proposed logical frame of fracture mechanics. There is a divergence of conclusion for every case of steel type. Cases studied are those of an ordinary mild steel, two kinds of quenched-and-tempered high strength steels and a Mn-Mo steel for nuclear pressure vessels.