15. Fatigue Crack Growth Under Random Loading

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This paper describes fatigue crack growth under variable amplitude loadings. Loading patterns investigated are single and multiple tensile overloads, single and multiple Intermittent overloads, block programmed load with both short and long block sized and narrow band random loading. Fatigue crack growth retardation following tensile overloads increases with increasing overload ratio, and with the number of overload cycles. In the case of block programmed loading, the crack propagation rate increases with decreasing block size and with increasing mean stress when the stress distribution within each block remains the same. It is found that fatigue crack growth under random loading corresponds with that under programmed loading only when the block size is short. An empirical model for retardation, which is applicable to life estimation, for block programmed loading and random loading is proposed. The model assumes a bi-linear relationship between effective stress intensity factor range and crack extension during both the delayed retardation stage and the recovery stage. Lives estimated by the model show good agreement with experimental results. The linear cumulative damage law gives non-conservative predictions for the tests conducted under random loading and block programmed loading with short block length, although it gives conservative estimates for tensile overload tests and. block programmed load tests with long block length.
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15. Fatigue Crack Growth Under Random Loading

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