TMCP型HT50鋼板溶接継手の曲げおよび圧縮強度に関する検討

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Recently Thermo-Mechanical Control Process steels, that is TMCP steels, have begun to pervade as ship hull materials. TMCP steel plate, that have less carbon equivalent (Ceq.), is generally superior to conventional steel with same strength level in respect to weld cracking property, joint toughness etc.. And selection of these steels also seems to be promoted by a strong demand of ship owners and shipbuilders on hull weight saving and fabrication efficiency improvement. So that, hereafter, it seems that these steels are increasing more and more in ship and off-shore structure building. TMCP steel joints, however, subject to large heat input which is desirable from fabricating efficient point of view are apt to have soft heat affected zone (soft HAZ) which might weaken joint strength. In these circumstences, the authors have investigated the effect of soft HAZ on several kinds of strength characteristics essential to structural design. And in this report, bending and compressive strength of TMCP type HT50 steel welded joints are shown. Especially, following four items are considered. 1. Effect on collapse load by a plastic analysis in which hinge mechanism is considered. 2. Estimate of allowable soft HAZ to maintion load-carring capability in bending. 3. Effect on buckling stress as an eigen value. 4. Effect on ultimate strength in compression. And those were conducted 4 point bend test using TMCP type HT50 welded joints whose Ceq. are 0.25% and 0.32%, and several kinds of numerical analyses. As a result of this study, it has shown that the degraded bending strength by soft HAZ would be compensable by careful consideration on the work hardening of the material and the drop of compressive strength due to the soft HAZ would be rather small in contrast with some other factors such as initial deflections.
社団法人日本船舶海洋工学会の論文
1985-08-24

TMCP型HT50鋼板溶接継手の曲げおよび圧縮強度に関する検討

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