104 実働状態の把握と強度評価(設計・生産技術現場における強度信頼性と安全性の確保)

概要

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To improve the strength reliability of machines, it is important to evaluate not only materials strength but also the service load. In this paper, taking the component of gas turbines, the evaluation methods for service loads are described. Design of expriments is employed for evaluating service temperature condition based on materials microstructure changes. For compressor stall loads, measurements of the pressure or strain was directly performed to assess the fatigue damage of blades. In the first-stage nozzle of gas turbine, surface cracks were observed from inspection data and scraps of nozzles. These cracks are very shallow because the thermal gradient in the nozzle is very steep. It is suggested that the maximum crack length is more proper parameter for estimating to nozzles. In order to evaluate material degradation, small punch test was conducted and the fracture energy obtained. The results showed good correlation with crack density. These suggest the efficiency of this method in evaluating service loads and residual strength in gas turbine.
一般社団法人日本機械学会の論文
2001-03-27