Estimate the Marin loading factor k_c for a 1–in-diameter bar that is used as follows.
(a) In bending. It is made of steel with S{ut}= 100LN \left(1,0.035\right) kpsi, and the designer intends to use the correlation \acute{S} _e=\Phi _{0.30}\bar{S} _{ut} to predict \acute{S} _e .
(b) In bending, but endurance testing gave \acute{S} _e=55LN \left(1,0.081 \right) kpsi.
(c) In push-pull (axial) fatigue, S_{ut}= LN\left(86.2,3.92\right) kpsi , and the designer intended to use the correlation \acute{S} _e=\Phi _{0.30}\bar{S} _{ut}.
(d) In torsional fatigue. The material is cast iron, and \acute{S} _e is known by test.