Fatigue Crack Propagation in Ceramic Wheel Used For Gas Turbine

Abstract

This paper studies and compared the fatigue crackpropagation rate da/dN for three kinds of ceramic wheel(model A, model B, and model C) made of Si3N4 ceramic withdifferent additives used for gas turbine application. The stressintensity factor range was calculated using finite elementmethod and then compared with analytical approximateapproaches. Experimental fatigue test was carried out on thethree specimens taken from the models. As a result, the typesof additives effect on fatigue crack propagation rate. Themodel A has the highest da/dN values and model C exhibits thelower values of da/dN.