![]() ![]() The other is the assumption that each positive zero crossing implies a cycle of vibration, which is fine for narrow band response, but is too conservative for a wide band response.Many other frequency-domain methods are available, which produce much better correlation with rainflow-counting results for wide-band random response. ![]() One is that the stress levels are lumped into 3 baskets of 1, 2, 3, when in reality they are distributed in amplitude. It's also worth noting that if the mean S-n data was used, Rn would equal 0.01 with a mean time to failure of 200 hrs (however there would be a 50/50 chance that the material used in this component would have these properties).Steinberg’s method is useful for illustrating the basic concept of fatigue analysis for random processes, but it has a couple of drawbacks which hinder its accuracy. This Rn value also corresponds to a mean time to failure of 3.5 minutes (the test duration divided by the value in parentheses above). ![]()
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