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A Study on fatigue and creep-fatigue life assessment using cyclic thermal tests with Mod.9Cr-1Mo steel structures

改良9Cr-1Mo鋼構造物の熱疲労試験による疲労及びクリープ疲労寿命評価法の検討

安藤 勝訓 ; 金崎 宏*; 伊達 新吾*; 菊地 浩一*; 佐藤 健一郎*; 高正 英樹*; 月森 和之

Ando, Masanori; Kanasaki, Hiroshi*; Date, Shingo*; Kikuchi, Koichi*; Sato, Kenichiro*; Takasho, Hideki*; Tsukimori, Kazuyuki

改良9Cr-1Mo鋼構造物試験体を用いて熱疲労試験を実施した。得られた結果について有限要素法解析をもとに寿命を評価し、有限要素法に基づく寿命評価法について検討した。温度制御のための短時間保持及び周方向の温度分布を適切に考慮することで改良9Cr-1Mo鋼構造物は提案された評価法により適切に評価できることが明らかとなった。

To assess the failure estimation methods, cyclic thermal loading tests of cylindrical models with thick part were performed. In the tests, crack initiation and propagation processes at stress concentration area were observed by replica method. Besides those, finite element analysis (FEA) was carried out to estimate the number of cycles to failure. The crack initiation life was in a good agreement with the FEA result by considering the short term compressive holding. Through these test and FEA results, fatigue and creep-fatigue life assessment methods of Mod.9Cr-1Mo steel including evaluation of cyclic thermal loading, short term compressive holding and failure criterion, were discussed.

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