For the plane stress element shown in Figure P15–16 subjected to a uniform temperature drop of T = 20 ° C, determine the thermal force matrix {fT}. Let E = 210 GPa, n = 0:25, and a = 12 × 10–6 (mm/mm)/ ° C. The coordinates (in millimeters) are shown in the figure. The element thickness is 10 mm.
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