In order to study the deformation of submarine pressure hulls under the effects of gravity. a sim-ple calculation formula of the deformation of the free ends of stiffened cylindrical shells is derived based on moment theory and non-moment theory. and the calculated results are compared with the results of Finite Element Analysis(FEA)which tests the reliability of the formula. The resu... https://thebrickes.shop/product-category/gas-cooktop/