Fractographic Analysis of Low Cycle Fatigue Specimens from a Failed Steam Turbine Rotor

2009 ◽  
pp. 249-249-26
Author(s):  
LD Kramer
Keyword(s):  
Steam Turbine ◽  
Low Cycle Fatigue ◽  
Turbine Rotor ◽  
Fractographic Analysis ◽  
Cycle Fatigue ◽  
Steam Turbine Rotor

The Fatigue and Fracture Analysis of Steam Turbine Rotor Shafts Containing Defects

2019 ◽  
Vol 795 ◽  
pp. 254-261
Author(s):  
Shang Wang ◽  
Wei Qiang Wang ◽  
Ming Da Song ◽  
Hao Zhang
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Steam Turbine ◽  
Fatigue Crack Propagation ◽  
Low Cycle Fatigue ◽  
Turbine Rotor ◽  
Initial Surface ◽  
Cycle Fatigue ◽  
Steam Turbine Rotor ◽  
Fatigue Crack Propagation Life

In this study, the assessment and calculation methods for the crack propagation life of steam turbine rotor shafts containing defects are presented. The analytic methods for estimating the average stress and the alternating stress amplitude of the steam turbine rotor shafts are introduced. The defects on/in the rotor shafts were regularized by the method of fracture mechanics, and the high cycle fatigue crack propagation life and low cycle fatigue crack propagation life of the rotor shafts are estimated from Paris formula. Taking the 60MW turbine rotor shafts containing an initial surface defect and an initial internal defect as the examples respectively, the crack propagation life of them were calculated. The results indicated that the assessment method for the crack propagation life can preliminarily be both used to estimate the safety-operating life and to analyze the fracture reason of a steam turbine rotor shaft containing defects. This paper can provide reference for periodic maintenance and safety evaluation of turbine rotor shafts.

scholarly journals Low cycle fatigue modelling of a steam turbine rotor steel

2019 ◽  
Vol 23 ◽  
pp. 149-154
Author(s):  
Ahmed Azeez ◽  
Robert Eriksson ◽  
Mattias Calmunger ◽  
Stefan B. Lindström ◽  
Kjell Simonsson
Keyword(s):  
Steam Turbine ◽  
Low Cycle Fatigue ◽  
Turbine Rotor ◽  
Rotor Steel ◽  
Cycle Fatigue ◽  
Steam Turbine Rotor

Low Cycle Fatigue Characterization of a HP-IP Steam Turbine Rotor

2009 ◽  
pp. 1237-1237-24 ◽  
Author(s):  
Bicego V ◽  
Fossati C ◽  
Ragazzoni S
Keyword(s):  
Steam Turbine ◽  
Low Cycle Fatigue ◽  
Turbine Rotor ◽  
Cycle Fatigue ◽  
Steam Turbine Rotor

Assessment of Low Cycle Fatigue Life of Steam Turbine Rotor Based on a Thermodynamic Approach

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Yong-Jian Sun ◽  
Li-Sheng Hu
Keyword(s):  
Fatigue Life ◽  
Steam Turbine ◽  
Nonlinear Model ◽  
Damage Mechanics ◽  
Low Cycle Fatigue ◽  
Continuum Damage Mechanics ◽  
Turbine Rotor ◽  
Cyclic Stress ◽  
Cycle Fatigue ◽  
Steam Turbine Rotor

A new nonlinear model is proposed to assess the low cycle fatigue life of a 300 MW steam turbine rotor. Manson-Coffin equation and cyclic stress-strain relationship are employed to eliminate the unmeasured parameters, so all the parameters in model are measurable. Through comparison with that from the linear accumulation theory and continuum damage mechanics theory the results show this new nonlinear model describes the damage accumulation well and precisely in accordance with the practical test data. This approach supplies a new way to assess the damage of steam turbine rotor with satisfactory precision in engineering.

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