P12.69 At a point in a stressed body, the known stresses are σ x = 9 ksi (C), σ y = 13 ksi (T), σ z = 22 ksi (T), τ xy = 4 ksi, τ xz = −19 ksi, and τ yz = 8 ksi. Determine (a) the stress invariants. (b) the principal stresses and the absolute maximum shear stress at the point.

Elements Of Electromagnetics
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P12.69 At a point in a stressed body, the known stresses are
σ x = 9 ksi (C), σ y = 13 ksi (T), σ z = 22 ksi (T), τ xy = 4 ksi, τ xz = −19 ksi,
and τ yz = 8 ksi. Determine
(a) the stress invariants.
(b) the principal stresses and the absolute maximum shear stress
at the point.

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