Determine the strain energy in the rod assembly. Portion \(A B\) is steel, \(B C\) is brass, and \(C D\) is aluminum. \(E_{\mathrm{st}}=200 \mathrm{GPa}, E_{\mathrm{br}}=101 \mathrm{GPa}\), and \(E_{\mathrm{al}}=73.1 \mathrm{GPa}\).

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20 mm 3 kN 15 mm 2 kN B A | 2 kN 25 mm 5 kN CD 5 kN -300 mm- 400 mm -200 mm-