I wonder: How many cycles are accumulated in a sine test? If we are sweeping through frequencies and we are hitting some natural frequencies in the process, will the number of (fatigue) cycles be the fn*60 cycles pr minute? Since the time at peak stress will be rather short, will that be real fatigue cycles, or should we count cycles within the rms stress range. sqrt(2)/fn-sqrt(2)*fn. The latmter will be more cycles at lower stress level. Anyone with any experience here? We ar sweeping at 2 Oct/min.
Appreciate any input from experienced test engineers.
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