Service Load and Fatigue Strength : Report 13, The Effects of One Superposed Impulsive Load on the Fatigue Crack Propagation and the Final Fracture under Constant Stress Amplitude

Muraki, Makoto; Shimada, S.; Hagiwara, Yoshihiko; Aoki, Itsuro; Kunio, Takeshi; Nakamura, Hiroshi

doi:10.1299/jsme1958.12.1328

Cited by 4 publications

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“…It has been shown [5] that the critical crack depth above which there is a more marked effect from overload corresponds to the depth of a nenpropagating crack for a given stress concentrator.…”

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confidence: 99%

“…It has been shown [5] that overloads are most hazardous when the crack depth exceeds some critical value.…”

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confidence: 99%

“…There have been many observations of thermal fatigue damage to rotors. Various cracks have been detected in the rotors of steam turbines made by Westinghouse [i] and General Electric [2,3] and in the rotors of turbines used in France [4] and Poland [5]. There have also been cases of thermal-fatigue cracks in turbine disks made in this country [6].…”

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confidence: 99%

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Examination of fatigue resistance in turbine rotors on large models

1982

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Increased power levels at thermal and nuclear power stations have resulted in a substantial increase in the mechanical loads.The rotor is one of the most highly loaded parts [I]~ Apart from large dimensions (length up to 15,000 mm and diameter up to 1500 mm), the rotor in a turbine generator has many stress concentrators.The working reliability of such a component is determined by the fatigue resistance.Analysis of rotor failures indicates that an important part in the fatigue damage is played by the stress concentrations under working conditions.Very often, fatigue cracks occur at a place where two or more stress concentrators are localized, such as annular and segment grooves, pressed fittings, and holes for pins.Under the nominal working conditions, the growth of the fatigue cracks usually leads to increased vibration of the rotor, which is transmitted to the bearings, which enables one to stop the system in good time and thus avoid complete failure.

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confidence: 99%

“…It has been shown [5] that overloads are most hazardous when the crack depth exceeds some critical value.…”

mentioning

confidence: 99%