Consider a thin-walled tube with closed ends subjected to a maximum internal pressure of 4760 psi. The mean radius of the tube is 12.5 in. If yielding is not to occur in any region of the tube.

(a) What minimum wall thickness, , should be specified according to the Tresca criterion if the material has a uniaxial tensile yield strength of 85000 psi?

(b) If the material has a shear yield strength of 45000 psi, what should the minimum wall thickness be according to the Tresca criterion?