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Fatigue crack propagation experimental evaluation and modeling in an austenitic steel elbow from a LMFBR primary system piping

液体金属高速増殖炉一次系配管エルボーの疲労き裂進展に関する実験的・解析的評価

Garcia Rodriguez, D.; 榊原 安英*

Garcia Rodriguez, D.; Sakakibara, Yasuhide*

高速増殖原型炉もんじゅのエルボーの高温(400$$^{circ}$$C)における面内曲げでの低サイクル疲労き裂進展の挙動を3つの段階に分けて評価した。初めに、実寸法の試験片を用いた実験の測定値を評価した。この実験は、最大応力が生じる部位に、人工的な欠陥を設け、変位制御下で行われた。次に、FEAを用い、負荷されたエルボーの実際の応力分布をシミュレーションした。最後に、FEAデータを用いてJ積分基準の確定論的疲労き裂進展を行い、その結果と実験データを比較した。

The behavior of high temperature (400$$^{circ}$$C) low-cycle fatigue crack propagation during in-plane bending of an elbow from Monju LMFBR is presented in three stages. 1st, experimental measurements made in a real-size laboratory specimen are presented. This test was carried out under displacement-controlled conditions, with artificial defects introduced in the crown parts, where the maximum stress arises. 2nd, the experimental setup is simulated making use of FEA, in order to obtain the actual stress distribution through the loaded elbow. Finally, based on the FEA data, deterministic fatigue crack propagation based on the J-integral criterion is compared with the experimental data.

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