Creep-fatigue crack growth behavior of low alloy steel under displacement-controlled conditions

H. Kino, T. Igari, T. Tokiyoshi, F. Kawashima, Fujita Masaaki, T. Teramae, Shin Yoshino
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引用次数: 2

Abstract

A practical evaluation of crack growth lifetime using nonlinear fracture mechanics is needed for remaining-life assessment of high-temperature structural components after long-term service. In this study, creep-fatigue crack growth behavior under displacement-controlled conditions was examined using CT specimens on 2 1/4Cr-1Mo steel. The J-integral estimation method and the crack growth prediction method using the fully plastic solution were also examined. Creep-fatigue crack growth under displacement hold could be separated into fatigue crack growth in the cyclic portion and creep crack growth in the holding portion. These two mechanisms were competitive with each other, and crack growth behavior was determined by the dominant mechanism of fatigue and creep. The J-integral approach using the fully plastic solution was introduced for predicting low cycle fatigue crack growth and creep-fatigue crack growth with relaxation. The suitability of this solution was verified by comparing prediction with experimental data obtained via the slope-line-control method.
位移控制条件下低合金钢蠕变疲劳裂纹扩展行为
高温结构件长期使用后的剩余寿命评估需要用非线性断裂力学对裂纹扩展寿命进行实用的评估。本研究采用CT试样对2 1/4Cr-1Mo钢在位移控制条件下的蠕变疲劳裂纹扩展行为进行了研究。研究了j积分估计方法和全塑性解裂纹扩展预测方法。位移保持下蠕变-疲劳裂纹扩展可分为循环段的疲劳裂纹扩展和保持段的蠕变裂纹扩展。两种机制相互竞争,裂纹扩展行为由疲劳和蠕变主导机制决定。采用全塑性解的j积分法对低周疲劳裂纹扩展和蠕变-疲劳裂纹扩展进行了预测。通过与坡线控制法实测数据的对比,验证了该方法的适用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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