The design was based on a photoelastic optimisation study. Dumb-bell shaped, plane components, which modelled the critical region of blade roots only, were tested under symmetrical static tension. Simplified two-dimensional blades were spun to fracture. Considerable plastic opening of the single disc slot in the metal disc used in testing the RBSN blades occured, as predicted from photoelastic spinning tests. Ductile layers were used between all contact faces. Measured component strengths were compared with predictions based on photoelastic results and Neuber notch theory, using measured RBSN statistical material data. The measured strengths were less than predicted values because of different disc tooth flexibility and contact conditions. However, the results showed that the strength of the present design was 32% higher than that of a previous design. Single-slot discs are not recommended for spinning tests.
Static and spinning tests of reaction-bonded silicon nitride turbine blade roots
Testen von Turbinenschaufeln aus reaktionsgebundenem Siliciumnitrid statisch bzw. unter Drehbelastung
Proceedings of the British Ceramic Society, Meeting of the Basic Science Section ; 32 , Mar ; 371-385
1982
15 Seiten
Conference paper
English
Sintering of reaction bonded silicon nitride
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