Fatigue test data are required in an engineering design for N = 103 cycles, N = 105 cycles, and N = 107 cycles. Calculate the time required by the tests in hours (or days) for frequencies of
a. 1 Hz (test speeds of pioneers in fatigue testing)
b. 35 Hz (approximate speeds of most modem test machines)
c. 160 Hz (high-speed test machines)
Note: The majority of conventional high cycle fatigue tests are conducted in the frequency range of 30-300 Hz (Curbishley, 1988).
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