Problem #1Estimate the (1) endurance limit (Sn) and (2) 103fatigue strength (S103) for a steel bar (d < 10mm) with a Brinell hardness of 300 Bhn. Consider the case of fully reversed (a) rotating bending, (b) axial loading and (c) torsion, assuming laboratory polished specimens, room temperature, and 50% reliability. Problem #1Estimate the (1) endurance limit (Sn) and (2) 103fatigue strength (S103) for a steel bar (d < 10mm) with a Brinell hardness of 300 Bhn. Consider the case of fully reversed (a) rotating bending, (b) axial loading and (c) torsion, assuming laboratory polished specimens, room temperature, and 50% reliability.