A bimetallic thermal control is made of cold-rolled yellow
brass and magnesium alloy bars (Figure P15–12). The bars are arranged with a
gap of 0.005 in. between them at 72F. The brass bar has a length of 1.0 in. and
a cross-sectional area of 0.10 in.2, and the magnesium bar has a length of 1.5
in. and a cross-sectional area of 0.15 in.2. Determine (a) the axial
displacement of the end of the brass bar and (b) the stress in each bar after
it has closed up due to a temperature increase of 100F. Use at least one
element for each bar in your finite element model.
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