破壊靱性を考慮した船体用鋼板使用区分に関する提案(その2)

概要

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In the previous papers, some Use of Material Grades for Hull Structural Members (plate thickness≦80mm), in which the allowable crack lengths corresponding to the critical plate thicknesses were reasonable, were proposed at low temperatures down to -50℃ considering fracture toughness. In this paper, based on the ship hull structural member category in IACS Rules (1996), the stresses on structural members are determined according to NK Rules, and then two Use of Material Grades for Hull Structural Members are proposed at the service temperature -10℃ for the mild steel plate and high-tensile steel plate respectively. And also, for the application of ship hull steel plate at low temperatures, the critical plate thicknesses of ship hull steel plate for various grades are determined. Some conclusions are drawn as follows: (1) The use of material grades are depend on the importance and locations of structural members. (2) Comparing with the mild steel plate, for the high-tensile steel plate, the use of material grades are severe, since the assumed stresses are rather large on structural members.
社団法人日本船舶海洋工学会の論文
1999-09-04