For the following problem, unless noted otherwise, refer to Appendices F and/or G for necessary mechanical properties. Unless noted otherwise, assume gray cast iron, as appropriate.
A long, flat steel bar 4 in. wide and . thick is reduced in width to 3 in. There are circular fillets of . radius on each side. If the bar is subjected to an axial tensile load of 12,000 lb, calculate
(a) the average tensile stress in the wide portion of the bar some distance from the change in section.
(b) the average tensile stress in the narrow part of the bar.
(c) the maximum tensile stress adjacent to the circular fillet.
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