A thick-walled cylinder is loaded externally by P, as shown in Fig 6.2. Given that: a = 80 mm. b = 160 mm. c = = 30 MPa, Po 10.0 MPa: = Compute the magnitude of the internal pressure, P; given by the expression: P = c(a) (b a) + 2Pb a + b Po Fig R6.3: Thick-walled cylinder