Stability of a three-layer cylindrical shell

Problem. The article presents the results of studies stability a three-layer cylindrical shell. Factors that have significant impact on strength and shell were taken into account, namely reduced modules elasticity wall. Goal. purpose study is to develop methodology for calculating shell, which will significantly improve calculation practice such structures in relation determining critical external pressure Methodology. method variational using Euler equation mixed problem was used determine pressure. To those factors its modulus bending stiffness Dh replaced by taking account shear deformation. Results. current state issue has been studied. Using methods with problem, condition equality internal forces orthotropic structure, indifferent equilibrium radial displacement, compiled. Accepting previously obtained movements substituting it potential energy system per unit length, we analytical solution tested design crane running wheel, an elastic insert. We get pkr=1267 MPa. For wheels, allowable wheel rail within 250 MPa, is, reserve nc=1267/250=5.1. As you can see, margin more than sufficient. In addition, comparison made between described [20]. Originality. A new under action developed. quantitative assessment traveling insert, carried out. Practical value technique structure created.