A short-time test is to be performed on a part having tensile strength of 90,000 psi and an endurance limit of 33,000 psi for a machined surface. Suppose the part is first run for n1 = 30,000 reversals with the service stress σR1 of 34,786 psi. Then it is loaded with a σR2 of 50,000 psi until failure at 39,074 additional reversals. Find the expected service life at σR1 = 34,786 psi.
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