Author(s)

S.B. Lee & J.Y. Kim

Abstract

Crack propagation model for high temperature structures under creep-fatigue loading S.B. Lee, J.Y. Kim Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon, 305-701, Korea ABSTRACT This study seeks to contribute to improved life prediction analysis of high temperature structures. In case of failure under high temperature cyclic loading, material is damaged by cavity growth and crack propagates along the cavitated grain boundaries with higher growth rate. With this cavity damaging effects, a crack growth model has been developed. Using this model, computer simulation of life prediction has been performed for 304 stainless steel under various loading shapes at high temperature. INTRODUCTION High temperature structures such as blades and vanes in gas turbine engines, piping in liquid metal fast breeder reactors are subject to not only steady operation at the normal design but also cycling. Under these operating conditions most

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