Force-Temperature-Deformation Relationship  
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The figure shows a free body diagram of the steel rod wedged into the brass link. The free body diagram cuts across the brass link and the steel rod. The forces at the top and bottom segments of the brass link are one half of F subscript 1 directed rightwards. The force on the steel rod is F subscript 2 directed rightwards.

Write the force-temperature-deformation relationship for each member.

For brass link (1), the force-temperature-deformation relationship is:

and for steel rod (2):