ガスタービン静翼材の熱疲労き裂シミュレーションによる寿命評価

概要

論文の詳細を見る
Life assessment methodology is presented for gas turbine nozzles severely damaged due to thermal stress fluctuations. There are two steps in the assessment. The first step is trend analysis and the second is multiple crack growth simulation. The trend analysis is performed to get crack destribution characteristics and crack growth trends by using a relational data base system for periodical inspection. In the multiple crack growth simulation, dendrite structure of nozzle superalloy is reproduced as an area filled with fractal geometry and multiple cracks are located on the area with the specific distribution. Multiple crack growth simulation is conducted by calculating cumulative damage distribution for each crack. The crack distribution by simulation agrees well with exprimental results. The life prediction by simulation can be used for run/repair/retire decision effectively.
1992-03-10