Engineering, 28.02.2020 04:34 juan1216av
A fatigue test is performed on 69 rotating specimens made of 5160H steel. The measured number of cycles to failure (L in kcycles) is given below, where f is frequency. Assuming a normal distribution, how many specimens are predicted to fail at less than 115 cycles? L 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 f 2 1 3 5 8 12 6 10 8 5 2 3 2 1 0 1 a. Estimate the mean and standard deviation of the life for the population b. Assume the distribution is normal. Predict the number of failed specimens at less than 115 k cycles. c. Assume the distribution of failures remains the same size (that is the standard deviation does not change). What should the mean value of the life expectancy be to ensure approximately 99% of the samples survive at 115 k cycles?
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A fatigue test is performed on 69 rotating specimens made of 5160H steel. The measured number of cyc...
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