実働状態の P-S-N 曲線を用いた燃焼室壁部材の寿命推定と疲労寿命設計法

概要

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In this paper, the fatigue life evaluation method for the components of combustion chamber was considered on the basis of P-S-N curve obtained in service conditions. Also, the fatigue life design method for these components and some results of its application were described. First, the stress pattern in service load was modeled as the two step duplicated alternative stress pattern by applying Range Pair Mean Method for reading stress cycle frequency and Modified Goodman's Theory for evaluating mean stress. Then, the P-S-N curve in service condition was analysed for some examples of failure through calculation of fatigue damage by the linear damage theory and the non-linear damage theory. The values of the experimental constants and the relation between them were obtained in these fatigue damage calculation methods. According to the above mentioned results, the allowable stress ranges for several components were calculated under the condition that the allowable probability of failure was assumed to be 0. 1 % or 1. 0% and the required life to be ten years. By comparing the obtained allowable stress ranges with those learned in experience, the present fatigue life evaluation method was confirmed to have sufficient reliability to be used as a fatigue life design method for these components.
社団法人日本材料学会の論文
1981-08-15