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Strojarstvo : časopis za teoriju i praksu u strojarstvu, Vol. 51 No. 4, 2009.

Izvorni znanstveni članak

An Estimation of Sufficient Impact Toughness for the Material of a Turbine Shaft

Nenad GUBELJAK ; Fakulteta za strojništvo, Univerza v Mariboru, Maribor, Slovenia
Jozef PREDAN ; Fakulteta za strojništvo, Univerza v Mariboru, Maribor, Slovenia
Dražan KOZAK orcid id orcid.org/0000-0001-5245-4686 ; Strojarski fakultet u Slavonskom Brodu, Sveučilište J.J. Strossmayera u Osijeku, Slavonski Brod, Hrvatska
Jelena TUMA ; Inštitut za kovinske materiale in tehnologije, Ljubljana,Slovenia
Boštjan KOVAČIČ ; Fakulteta za gradbeništvo, Univerza v Mariboru, Maribor, Slovenia
Pejo KONJATIĆ ; Strojarski fakultet u Slavonskom Brodu, Sveučilište J.J. Strossmayera u Osijeku, Slavonski Brod, Hrvatska
Josip SERTIĆ ; Fakulteta za strojništvo, Univerza v Mariboru, Maribor, Slovenia

Puni tekst: engleski pdf 2.514 Kb

str. 263-271

preuzimanja: 978

citiraj

Sažetak

The fracture of a turbine shaft in the case of overloading can exhibit brittle or plastic failure, depending on the material properties, the turbine-shaft geometry and the form of loading. Usually, when the toughness increases, the stiffness of the shaft material is reduced, which can lead to the plastic twist of the shaft. If the fatigue crack appears in the critical region of the shaft then the low impact-toughness value may induce a brittle fracture.
During the retrofit of a hydro-power plant a new turbine shaft was produced by quenching-and-tempering technology. Charpy impact-toughness tests
showed lower values for the shaft material than those prescribed by the project documentation. Since the turbine shaft for a hydro-power plant is a massive and expensive component, it is necessary to determine a sufficient impact toughness for the material in terms of the geometry and the manner of loading for the turbine shaft. Since only the yield strength and the impact toughness of the material were prescribed, the level 0 of the SINTAP should be applied. The minimum impact toughness values that ensure the ductile fracture of the shaft, cracked circumferentially was also estimated. We also analyzed the variation of the shaft’s carrying capacity resulting from a reduction of the non-cracked ligament in the transversal direction.

Ključne riječi

Carrying capacity; Impact toughness; Limit load for torsion; SINTAP; Turbine shaft

Hrčak ID:

48238

URI

https://hrcak.srce.hr/48238

Datum izdavanja:

31.8.2009.

Posjeta: 1.979 *