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How would the answers to Problems 8.5 and 8.6 change if the loading is reversed axial loading rather than rotating bending?
Problems 8.5
Estimate the rotating bending endurance limit and also the 103 -cycle fatigue strength for standard R. R. Moore test specimens made of steels having Brinell hard nesses of 100, 300, and 500.
Problems 8.6
Estimate the long-life fatigue strength for rotating bending (state whether it is for 108 or 5 x 108 cycles) of standard R. R. Moore specimens made of
(a) wrought aluminum, Su = 250 MPa,
(b) wrought aluminum, Su = 450 MPa,
(c) average-grade cast aluminum, and
(d) average-grade forged magnesium.
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