A rectangular steel plate with thickness t = 0.25 in. is subjected to uniform normal stresses (x and (y, as shown in the figure. Strain gages A and B, oriented in the x and y directions, respectively, are attached to the plate. The gage readings give normal strains (x = 0.0010 (elongation) and (y = - 0.0007 (shortening).
Knowing that E = 30 ( 106 psi and v = 0.3, determine the stresses (x and (y and the change (t in the thickness of the plate.

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y B