The force P is applied to the bar, which is composed of an elastic perfectly plastic mater...

The force P is applied to the bar, which is composed of an elastic perfectly plastic material. Construct a graph to show how the force in each section AB and BC (ordinate) varies as P (abscissa) is increased. The bar has cross-sectional areas of 1 in2 in region AB and 4 in2 in region BC, and σY = 30 ksi.