Question: A certain point in a strained material, the stresses on the two planes at right angles to each other are 40 N/mm 2 and 20

A certain point in a strained material, the stresses on the two planes at right angles to each other are 40 N/mm² and 20 N/mm² both tensile. They are accompanied by shear stresses of magnitude 20 N/mm² . Find graphically or otherwise, the location of principal planes and evaluate the principal stresses.

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