Determine directional cosines of normal to one of the planes
The stress components at a point in a plate are sigma(xx)=-100Mpa, sigma(yy)=sigma(zz)=20MPa, sigma(xy)=sigma(yz)=0 and sigma(xz)=-80Mpa. Determine the directional cosines of the normal to one of the planes on which the maximum shear stress acts.
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