An axially loaded compression member is cold formed from an AISI 10^-5 steel plate. A cross-section of the member is shown in Figure K8-1. The metal at the corners of the member was strengthened by cold work. Determine the ultimate and yield strengths of the material prior to forming; the yield strength of the material at the corners of the section after cold forming; and the average yield strength of the section, accounting for the flat portions and the corners strengthened by cold work. Assume a compact section and a reduction factor r = 1.0 (Figure K8-1).

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3.44" -0.8125". 1.415"- 3/16" 0.105-