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The stress tensor at a point is given by the following
ox = 40 oy = 30 oz = 20 MPa, Txy = 20 MPa, tyz = 40 TxZ = 30
20 MPа , тху %3D 20 МРа , тух %3D 40 тxz %3D
%3D
MPа
calculate stress invariant and prove that it is unchanged when the
system is rotated by 60 degree anticlockwise about x3.

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