Hi all, i need some help working out the following; a cylinder has; internal diameter 60mm = 0.06m /2 for radius = 0.03m external diameter 100mm = 0.10m /2 for radius = 0.05m the cylinder is subjected to an internal pressure of 20Mpa and external pressure 5Mpa, determine:
1) the radial inner wall 2) hoop stress inner wall 3) the radial outer wall 4) hoop stress outer wall 5) longitudinal stress in the cylinder wall
firstly, i would work out the longitudinal stress using lame's constant stress for A
a = σL = (P1(R1²)) - (P1(R2²))
(R2²) - (R1²)
a = σL = ((20x10^6(0.03²)) - (5X10^6(0.05²))
(0.05²) - (0.03²)
= 5500/0.0016 =3.44Nm² ....are these units correct?