An element in plane stress from the frame of a racing car is oriented at a known angle ( (see figure). On this inclined element, the normal and shear stresses have the magnitudes and directions shown in the figure.
Determine the normal and shear stresses acting on an element whose sides are parallel to the xy axes, that is, determine (x, (y, and Txy. Show the results on a sketch of an element oriented at ( = 0o.

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2475 psi 3950 psi θ = 40° 14,900 psi