cylindrical pressure vessel, with a diameter of 40cm and a wall thickness of 10mm is made of steel (isotropic, with Young’s modulus = 200GPa ; Poisson’s ratio = 0.28 ) and is pressurized to 20MPa . The longitudinal and hoop stresses in the wall, σl and σh , respectively, are given by

Question

cylindrical pressure vessel, with a diameter of  40cm  and a wall thickness of  10mm  is made of steel (isotropic, with Young’s modulus =  200GPa ; Poisson’s ratio =  0.28 ) and is pressurized to  20MPa . The longitudinal and hoop stresses in the wall,  σl  and  σh , respectively, are given by
Sigma l=pr/2t
Sigma h=pr/t
What is the strain in the radial direction, through the thickness of the pressure vessel?