SEDL / STP / STP942-EB / STP24504S

A Maximum Stress Modified Life Equation on the Basis of a Fatigue-Creep Interaction Map

Chen, GL
Beijing University of Iron and Steel Technology, Beijing,

He, QF
Beijing University of Iron and Steel Technology, Beijing,

Gao, L
Beijing University of Iron and Steel Technology, Beijing,

Zhang, SH
Beijing University of Iron and Steel Technology, Beijing,

Pages: 12    Published: Jan 1988

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Abstract

The effects of maximum stress on crack initiation and propagation, the fracture life, and the dynamic creep rate have been studied on the basis of a fatigue-creep interaction fracture map. A number of maximum stress modified equations have been deduced to describe the complete interaction behavior of a large ESR-Cast-to-Shape superalloy disk under a wide range of fatigue and creep stress combinations at a constant temperature. All the observed fracture lives fall within a range of a factor of two of fracture lives predicted by these equations.