Estimation of creep and fatigue behaviour under cyclic loading

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Abstract
Equations to estimate creep behaviour under cyclic stressing have been developed from the assumption of strain hardening. Reasonable correlations were obtained with experimental data for tensile-stress cycling of a nickel alloy and an 11 per cent chromium steel at elevated temperatures. A cyclic hardening effect was identified which lowers rates of strain accumulation and leads to unexpectedly long endurances, particularly at the higher loading rates and temperatures. However, this causes estimated lives to err on the safe side. Behaviour is predominantly fatigue-dependent at the lower temperatures but either creep or fatigue may predominate at intermediate temperatures. Assumption of linear damage enabled reasonable estimates of lives to be made for different loading rates and stresses by use of readily available creep and plain fatigue data. There was no evidence of any creep-fatigue interaction that could cause reduced endurances.

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