Combined analysis method for low-cycle fatigue damage variables in the welded joint of steam turbine rotors

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Abstract

Analyses of low-cycle fatigue damage to welded joints in turbine rotors are significant to safety assessments. In this paper, fatigue damage mechanics are used to analyze low-cycle fatigue in a 1:1 simulated sample of a NiCrMoV steel low-pressure (LP) steam turbine welded rotor. The elastic modulus method and the stress amplitude method both cannot accurately represent the fatigue damage variable, so this paper presents a combined analysis method, which considers the material damage during cyclic softening (or hardening) in cyclic softening materials or materials with cyclic hardening followed by softening. The results are better than with previous methods for low-cycle fatigue analyses of NiCrMoV steel LP steam turbine welded rotors.

Keywords NiCrMoV steel welded rotor low-cycle fatigue damage variable

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Issue Date: 15 February 2014

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	Zhipeng CAI
	Jiandong WU
	Zhinan TANG
	Boqi ZHANG
	Jiluan PAN
	Xia LIU

Cite this article:

Zhipeng CAI,Jiandong WU,Zhinan TANG, et al. Combined analysis method for low-cycle fatigue damage variables in the welded joint of steam turbine rotors[J]. Journal of Tsinghua University(Science and Technology), 2014, 54(2): 178-184.

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http://jst.tsinghuajournals.com/EN/ OR http://jst.tsinghuajournals.com/EN/Y2014/V54/I2/178

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