IMPROVED COMPUTATION METHOD IN FAILURE ANALYSIS OF LAYERED COMPOSITE SHELL TYPE STRUCTURES

摘要

The aim of the work presented here is the development of an efficient computation method in failure analysis of layered composite shell type structures. This paper presents a general numerical approach in postbuckling and failure analysis of laminated fibrous composite structures. Special attention is focused on initial failure analysis of layered shells in postbuckling domain. A new eight-degree of freedom finite element model for laminated composite shells is used. The model utilizes three displacements, two rotations of normals about the plate midplane, one in-plane rotation and two warps of the normals, for accurate and efficient determination of the laminate stresses and postbuckling behavior. A failure model for the determination of the first ply failure (FPF) based on these stresses has been developed. Presented numerical results are compared with own and other experimental results in postbuckling domains of laminated fibrous composite structures.