For an off-axis orthotropic material in plane stress, find general an expression for the angle where the maximum/minimum values of material constants nxyx occurs. express your answer as a cubic equation for cos 20. for unidirectional b(4)/5505 boron-epoxy (e = 204.0 gpa, e, = 18.5 gpa, v12 = .23, g12 = 5.59 gpa), find the angles that solve the equation.

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deez>?

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YE

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