Hi Peteroznewman,nYes, I used the online calculator at a point. My input parameters; diameter of the plate = 50mm, hence a=25mm; young modulus (E) = 575 mpa; poission ratio (v) =0.46; pressure (P) = 0.005psi; thickness of the plate is 0.381mm.nThe plate is a surface body modeled in Design Modeller. However, I'm not sure which shell element was selected during meshing. Did I make any mistake with the setup?nThank you.n