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The paper deals with the scatter under program and random loading. For the explanation of the results, constant amplitude tests and tests with biharmonic loading are also included in the study. The basis of the comparison of the data is the logarithmic normal distribution and its parameters. It was found that scatter under program, random, and biharmonic loading is identical and is similar to the scatter derived in constant amplitude tests in the life range of about 105 load cycles. This is true for life as well as for crack propagation. Miner's rule overestimates the scatter, which occurs in tests simulating irregularly varying service loads. An important influence on scatter is due to the testing machine.
fatigue(materials), probability theory, probability distribution functions, crack propagation, crack initiation, reliability, loading, scattering, fatigue life, constant life fatigue diagrams, statistical analysis, fatigue tests, loads(forces)
Institut fuer Werktoff-Forschung, Porz-Wahn, Germany