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8.41 (C). Determine the values of the stress invariants and the principal stresses for the cartesian stress components given in Problem 8.2. [450; 423.75; 556.25; 324.8; 109.5; 15.6 MN/m2]

8.42 (C). The stress tensor for a three-dimensional stress system is given below. Determine the magnitudes of the three principal stresses and determine the eigen vectors of the major principal stress.

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