For the plane stress element shown in Figure P15–14 subjected to a uniform temperature rise of T = 30 ° C, determine the thermal force matrix { fT}. Let E = 70 GPa, n = 0:3, α = 23 ° 10–6 (mm/mm)/ ° C, and t = 5 mm. The coordinates (in millimeters) are shown in the figure.
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