Who can answer this question? Many thanks!
A bar of steel has following properties:Se=250MPa, Sy=500MPa and Su=800MPa for a reliability factor of 92%. For each of the cases below, when all the correction factors apart from Kc are equal to 1, find the factor of safty guarding against a static failure and either the factor of safty guarding against a fatigue failure or the expected life of the part with a reliability factor of 95%.
(a) A tortional stress between 250MPa and -150MPa(negative)
(b) the previous situation (a) with an added steady tensile stress of 50MPa