Accession Number : ADA202572


Title :   Nonlinear Finite Element Analysis of a General Composite Shell


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING


Personal Author(s) : Egan, Gregory S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a202572.pdf


Report Date : Dec 1988


Pagination or Media Count : 178


Abstract : An analytical study, using the STAGSC-1 computer code, was conducted on a Kevlar/Polyester composite shell of general shape with internal asymmetrical pressure loading. Experimentation was conducted on the shell to find displacements in the shell due to this internal pressure loading. Modeling of the composite structure was done in increments whereby each change in the finite element model better approximated the actual shell. Nonlinear computer runs were done at each model increment to compare against experimental results. Linear computer runs were also completed for comparison purposes. It was found that accurate modeling of the shell to include thickness variations, boundary conditions, and materials is essential to obtain reasonable results. Also, the incorporation of the nonlinear analysis leads to displacement results that are within 15% of experimentation. Linear results from the same model are in error by over 75% due to large displacements in the shell. Keywords: Finite element analysis, Composite materials, Theses.


Descriptors :   *FINITE ELEMENT ANALYSIS , *SHELLS(STRUCTURAL FORMS) , *COMPOSITE STRUCTURES , COMPOSITE MATERIALS , LOADS(FORCES) , DISPLACEMENT , SHAPE , ACCURACY , THESES , VARIATIONS , BOUNDARIES , NONLINEAR SYSTEMS , ASYMMETRY , COMPUTER APPLICATIONS , NONLINEAR ANALYSIS , POLYESTER PLASTICS , MODELS , INTERNAL PRESSURE , MATHEMATICAL MODELS , THICKNESS


Subject Categories : Laminates and Composite Materials
      Numerical Mathematics


Distribution Statement : APPROVED FOR PUBLIC RELEASE