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The normal stresses acting on two perpendicular planes at a point in a strained material are 70 MN/ m2 tensile, and 35 MN/ m

The normal stresses acting on two perpendicular planes at a point in a strained material are 70 MN/ m2 

The normal stresses acting on two perpendicular planes at a point in a strained material are 70 MN/ m2 tensile, and 35 MN/ m compressive. In addition, a shear stress of 40 N/mm2 acts on these planes. Calculate the following: (i) The magnitude of the principal stresses (ii) The direction of the principal planes (iii) The magnitude of the maximum shear stress.

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