Proceedings Vol. 15 (2009)
ENGINEERING MECHANICS 2009
May 11 – 14, 2009, Svratka, Czech Republic
Copyright © 2009 Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague
ISSN 1805-8248 (printed)
ISSN 1805-8256 (electronic)
list of papers scientific commitee
pages 1405 - 1411, full text
Results from periodical inspections show the fatigue crack location in basic material of steam-boiler. Cracks were located on internal body surface on edge of the nozzle hole. Calculated results recognize the stress concentration in places with cracks. The possible degradation mechanisms and cause of fatigue defect rise was appointed the thermal fatigue subjected by temperature cycling during the boiler operation. But the temperature cycling was not recognized yet. For this reason it was arranged the short-time temperature measuring on the external nozzle surface near the weld and on the external surface of the boiler body.
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