A cast-steel C frame as shown in the figure has a rectangular cross section of 1.25 in
A cast-steel C frame as shown in the figure has a rectangular cross section of 1.25 in by 2 in, with a 0.5-in-radius semicircular notch on both sides that forms midflank fluting as shown. Estimate A, rc, rn, and e, and for a load of 2000 lbf, estimate the inner and outer surface stresses at the throat C. Table 34 can be used to determine rn for this section. From the table, the integral « dA/r can be evaluated for a rectangle and a circle by evaluating A/rn for each shape [see Eq. (364)]. Subtracting A/rn of the circle from that of the rectangle yields « dA/r for the C frame, and rn can then beevaluated.
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0.5-in R. 4.5 in 2000 lbf 1.25 in 1.25-in R. 0.5 in 0.5 in
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