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For estimation of the fatigue life of the combustion chamber walls, a study has to be made on the influence of various stress fluctuation on the fatigue strength of material.<BR>From this point of view, taking the cooling side of combustion chamber walls as the object of study, the fatigue tests on Cr-Mo cast steel were carried out through four types fluctuating stress wave patterns set on the basis of the measurement results of load on ship under service condition and stress analysis.<BR>The following results have been obtained:<BR>1) It has been confirmed that the fatigue life under superimposed stress wave pattern decreases even when superimposed stress amplitude is below the fatigue limit of the material.<BR>2) The fatigue life <I>Nt</I> by various fluctuating stress wave patterns is nearly within a range of 3<I> Ne</I> - 1/3<I> Ne</I> of the estimated life <I>Ne</I> by the modified Miner rule. This means that rough life estimation of the combustion chamber walls can be made by this method.<BR>3) The influence of the stress change by cleaning work of turbo chargers and the engine starting/stopping in a harbor, the fatigue strength of cooling side of the combustion chamber walls is small. This can be neglected.<BR>4) It has been clarified that there exists a linear relationship between number of superimposed stress cycle and fatigue life in log-log scale. Based on this result, we proposed an experimental equation on the influence of number of the superimposed stress cycle to the superimposed fatigue strength of material.
- 公益社団法人 日本マリンエンジニアリング学会の論文
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