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Unformatted text preview: 2 Pascal, Pa = N/m 2 Y = 1.00 for a center cracked plate 1 min. = 60s L=300cm w=10 cm t=0.127cm Question 3 A fatigue test is made with a mean stress of 15,000 psi and a stress amplitude of 20,000 psi. Calculate the maximum and minimum stresses. Question 4 An iron alloy for a bridge deck component was tested in the laboratory under applied cyclic stresses. The S-N curve generated for the alloy is shown below. During each year of service, the bridge deck and its components are expected to experience 100,000 cycles under a 40 ksi amplitude stress and 20,000 cycles under a 60 ksi amplitude stress. Using the S-N data below and Miner’s Law for cumulative fatigue damage, calculate the expected service life (in years) for the iron alloy component in the bridge deck. 20 40 60 80 100 10 4 10 5 10 6 10 7 10 8 10 9 Number of cycles to failure (Nf)...
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- Spring '09