For a rod made of the aluminum alloy 6061-T6, select the smallest square cross section that can be used if the rod is to carry a 37-kip centric load. 18 in. The value of d of the smallest square cross section is in.

The channel shape cross-section and the rectangular cross-section shown in the Figure Q4 are made of materials with elastic-perfectly plastic behaviour. The yield stress of the material used for the channel shape cross-section is y=405 MPa, whereas that used for the rectangular cross- section is 0.850y. Compute the thickness of the web, t, of the channel shape section if the two cross sections have identical plastic bending moment about the z-axis. In Figure 4, h= 74 mm, b=52 mm, a-8 mm, H=74 mm, d= 52 mm Z b h Figure Q4 Z d H