For the plane stress plate fixed along all edges and subjected to a uniform temperature decrease of 20 ° C as shown in Figure P15–18, determine the stresses in each element. Let E = 210 GPa, n = 0.25, and α = 12 × 10–6 (mm/mm)/ ° C. The coordinates of the plate are shown in the figure. The plate thickness is 10 mm. (Hint: The nodal displacements are all equal to zero. Therefore, the stresses can be determined from
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