Nonlinear Dynamic Buckling Of Laminated Composite Shallow Shells Under Impact Load

Nonlinear dynamic buckling of symmetrically laminated composite shallow spherical shells, laminated composite truncated shallow spherical shells and laminated composite truncated shallow spherical shells under multiform impact loads are investigated.In Chapter I , a detailed investigation on impact buckling is summarized. The history and development in this field are introduced as well. The motion criterions which define the critical impact buckling are summarized according to the classification. Finally, the content and investigating methods in this dissertation are introduced.In Chapter II, nonlinear dynamic buckling of symmetrically laminated composite shallow spherical shells under uniform rectangular pulse is investigated. Based on the first-order shearing deformation theory, nonlinear dynamic governing equation of laminated composite shallow spherical shells under uniform load are built and solved by Galerkin method and Runge-Kutta method. Budiansky-Roth motion criterion expressed by the displacement of the peak of the shell is employed to determine the critical impact buckling load. The influences of physical parameter and geometric parameters on impact buckling are discussed as well.In Chapter III, nonlinear dynamic buckling of symmetrically laminated truncated composite shallow spherical shells under uniform triangular pulse is investigated. The first order shearing deformation is considered in the governing equation. Galerkin method and Budiansky-Roth motion criterion are employed to determine critical impact buckling load. The influences of physical parameter, geometric parameters and boundary conditions on impact buckling are discussed as well.In Chapter IV and V, nonlinear dynamic buckling of symmetrically laminated composite shallow spherical shells and laminated composite truncated shallow spherical shells under concentrated impact load are investigated based on the theory of classical laminated shells. The governing equations are solved by Galerkin method and...