10. The stepped bar shown in the figure is subjected to a force at the center. Use FEM to determine the displacement at the center and reactions and flR.

Assume: E = 100 GPa, area of cross sections of the three portions shown are, respectively, 10-4m2, 2 x 10~4m2, and 10~4m2, and F = 10,000N.

Rl —

( 0.3 m j L 0.4 m ) ( 0.3 m

-» Rr