The dimensions and loads of a bar with a circular section with a smaller diameter in the center. This bar is made of an alloy which has a simplified strain-stress (normal) curve shown below.

a) Calculate the modulus of elasticity of the material

b) How much is the elongation or contraction in segment AB?

c) How much is the elongation or contraction in segment BC? (5pts.)

d) How much is the elongation or contraction of the complete piece?