A cylindrical bar of diameter 2.5-inches has a rounded groove of radius 0.1-in machined into it. If the bar is made of 1045 CD steel: a. Determine the number of cycles to failure if we apply a NOMINAL completely reversed rotating bending stress of 25-kpsi and we want a reliability of 99.9% ** Remember: the stress at the critical point with a stress concentration the NOMINAL stress multiplied by some scalar factor....