Abstract
An estimate has been made of the crack growth period in an M200 x 4 mm coupling bolt made of 26KhN3M2FA steel in a gas turbine operating at 293–523 K under fewcycle loading arising from thermal expansion of the disks together with the dimensions of nonpropagating fatigue cracks under many-cycle loading due to vibration. The critical ring crack depth in a 26KhN3M2FA steel bolt is 26 mm at a stress of 320 MPa. The crack develops to a critical size from a depth of 10 mm during 30,000 start-stop cycles.
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References
A. V. Prokopenko, V. T. Krangach, V. M. Stepkov, et al., Optimizing Screwed-Joint Design and Lifetime Estimation for a Coupling Bolt in the Rotor of a High-Power Gas Turbine [in Russian], AN Ukrainy, Kiev, Preprint (1992).
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Translated from Problemy Prochnosti, No. 9, pp. 53–57, September, 1992.
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Stepkov, V.M., Krangach, V.T. Estimating the viability of a tension bolt in a gas turbine. Strength Mater 24, 572–575 (1992). https://doi.org/10.1007/BF00773132
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DOI: https://doi.org/10.1007/BF00773132