The cantilever beam in Problem 7.28 is made of a low-carbon steel that has a yield stress...

The cantilever beam in Problem 7.28 is made of a low-carbon steel that has a yield stress Y = 200 MPa.

a. Determine the fully plastic load PP for the beam for the condition that α = 0.

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b. Determine the fully plastic load PP for the beam for the condition that α = π/6.

Problem 7.28

An extruded bar of aluminum alloy has the cross section shown in Figure P7.28. A 1.00-m length of this bar is used as a cantilever beam. A concentrated load P = 1.25 kN is applied at the free end and makes an angle of ϕ = 5π/9 with the x axis. The view in Figure P7.28 is from the free end toward the fixed end of the beam. Determine the maximum tensile and compressive stresses in the beam.

FIGURE P7.28