1.69.Obtain the principal stresses and the related direction cosines for the following cases: 4 6. 4 2 5| MPа, 6 5 1 а. 14.32 0.8 1.55 0.8 6.97 5.2 MPa 1.55 5.2 16.3

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A: given : t = 6.07mm = 0.00607 m F = 38.9 KN = 38900 N τ = 54.4 MPa = 54.4 x 106 N/m2

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