Abstract: The strain energy model (SEM),
including both strain energy partitioning (SEP) and strain
energy frequency separation (SEFS) developed by the present
authors which are the syntheses and modifications of strain
range partitioning (SPR), frequency separation (FS) and
Ostergren Model, is presented. In comparing the abilities of the
above five methods to predict the creep-fatigue lives of three
different strength and ductility materials Cr18Ni9Ti, GH36A and
GH33A with three different processings. The authors postulate
that SEP and SEFS have better predictabilities than the others
and thus more significant physical meanings. Finally, the
analyses of time-dependent fatigue of GH33A at 700℃ showed the
close dependence with the lives.
Key words:
Time-dependent fatigue Life
prediction Strain energy model Creep-fatigue-environment
interactions Nickel-base alloy
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