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Development of creep-fatigue evaluation method for modified 9Cr-1Mo steel

改良9Cr-1Mo鋼のクリープ疲労評価法の開発

高屋 茂 ; 永江 勇二 ; 浅山 泰 

Takaya, Shigeru; Nagae, Yuji; Asayama, Tai

日本機械学会設計・建設規格$$<$$高速炉規格$$>$$2012年版で新しく材料登録された改良9Cr-1Mo鋼を対象としたクリープ疲労評価法について述べる。本手法では、クリープ損傷と疲労損傷を個別に求め、線形損傷則に基づき破損の判定を行う。ここでは、設計係数等を考慮しない場合の手法としての保守性について、試験データを用いて検討した。さらに試験データを得ることが難しい長時間保持条件については、改良延性消耗則との比較を行った。これらの結果から、本手法が設計係数以外にも保守性を含んだものであることを示した。

This paper describes a creep-fatigue evaluation method for modified 9Cr-1Mo steel, which has been newly included in the 2012 edition of the JSME code for design and construction of fast reactors. In this method, creep and fatigue damages are evaluated on the basis of Miner's rule and the time fraction rule, respectively, and the linear summation rule is employed as the failure criterion. The conservativeness of this method without design factors was investigated using material test results, and it was shown that the time fraction approach can conservatively predict failure life.Comparison with the modified ductility exhaustion method, which is known to have good failure life predictability in material test results, shows that the time fraction approach predicts failure lives to be shorter in long-term strain hold conditions. These results confirm that the creep-fatigue evaluation method in the JSME FRs code has implicit conservatism.

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パーセンタイル:29.88

分野:Engineering, Mechanical

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