:(On the Fatigue Strength of the Piston Crown of Diesel Engine)

概要

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Piston crown of marine Diesel engine is subjected to the thermal and the mechanical stress which are superposed each other. The behavior of engineering metal under superposed stress should be evaluated, when the design and the fatigue life prediction are carried out. Two kinds of plain bending unnotched specimen of cast steel were tested under two kinds of superposed stress. One of them was the sequence with square wave variation of mean stress, and the other was the sequence with sinusoidal variation of mean stress. Two kinds of fatigue testing machine were used, one of them was Schenck type mechanical plain bending fatigue testing machine, and the other was an electro-hydraulic closed loop plain bending fatigue testing machine. Coefficients β and f have been proposed to explain the behavior of engineering metal under superposed stress. They were calculated from experimental results. A new method was proposed to predict the fatigue life of metal under superposed stress and on cumulative fatigue damage procedure. The predicted lives were in pretty well agreement with the service lives of piston crown and cylinder cover of marine Diesel engine.
公益社団法人日本マリンエンジニアリング学会の論文