A NEW FATIGUE-CREEP LIFE PREDICTION METHODOLOGY

Acta Metall Sin

2008, Vol. 44

Issue (10): 1167-1170 DOI:

Research Articles

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A NEW FATIGUE-CREEP LIFE PREDICTION METHODOLOGY

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国家压力容器与管道安全工程技术研究中心；中国科学技术大学

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. A NEW FATIGUE-CREEP LIFE PREDICTION METHODOLOGY. Acta Metall Sin, 2008, 44(10): 1167-1170 .

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Abstract Based on the concept of the equivalent crack and theories of crack growth, a fatigue-creep life prediction model is presented. The influence of time independent fatigue , time dependent static creep and cyclic creep on the equation of micro crack growth speed is considered. Tomkins micro crack growth model is applied to time independent crack propagation while C* parameter is applied to time dependent crack propagation.1.25Cr0.5Mo steel fatigue creep life with stress control at 540°C is predicted by the model. The predicted results are correlated well with the experimental ones.

Key words: Micro Crack Equivalent Crack Fatigue-Creep Life Prediction

Received: 15 January 2008

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2008/V44/I10/1167

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