舶用プロペラ材料の疲れ強さにおよぼす溶接補修の影響

概要

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To make clear the effect of weld repair on the fatigue strength of marine propellers, a series of tests has been carried out with the base metal and the welded metal under the condition of 3% synthetic sea water, plane bending load and stress ratio<I>R</I>=0.4 in which actual propellers are in service.<BR>The large specimens were manufactured of which measurements are 700 mm in length, 200 mm in width and 50 mm in thickness, to make the stress gradient of specimens the same with that of full-scale propellers. As to the material of specimens, two kinds of propeller materials were used such as Ni-Al-bronze and Mn-bronze.<BR>There were no differences in the fatigue strength between the base metal and the welded metal. Moreover the residual stress around the welded zone was successfully measured and the fatigue fractures of those materials were observed by the fractography.
社団法人日本マリンエンジニアリング学会の論文