FATIGUE-CREEP INTERACTION LIFE PREDICTION METHOD BASED ON DUCTILITY EXHAUSTION

Acta Metall Sin

2006, Vol. 42

Issue (4): 415-420 DOI:

Research Articles

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FATIGUE-CREEP INTERACTION LIFE PREDICTION METHOD BASED ON DUCTILITY EXHAUSTION

Zhichao Fan;;;

合肥通用机械研究所压力容器工程部

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Zhichao Fan. FATIGUE-CREEP INTERACTION LIFE PREDICTION METHOD BASED ON DUCTILITY EXHAUSTION. Acta Metall Sin, 2006, 42(4): 415-420 .

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Abstract Ductility exhaustion theory premises that material flow caused by loads under fatigue-creep conditions can be described by dynamic viscosity, and the criterion of failure is that dynamic viscosity equals material toughness. A new fatigue-creep life prediction method has been put forward based on ductility exhaustion theory with the assumption that ductility consumption only relates to plastic strain and creep strain caused by tensile stress, and plastic strain occurs only when tensile stress equates with σmax-(σmaxσa)^1/2. The method given is applicable for stress control mode, and includes effects of stress ratio, stress rate, tensile hold time, and mean strain velocity. Applicability of the new method is assessed with fatigue, creep, and fatigue-creep data on 1.25Cr0.5Mo under stress control at 540℃, and the prediction is found to be very satisfactory with a factor of ±×1.25.

Key words: fatigue creep ductility stress control high temperature

Received: 28 July 2005

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I4/415

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