Accession Number : ADA119625

Title :   Asymmetric Reinforcements of a Quasi-Isotropic Graphite Epoxy Plate Containing a Circular Hole.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : O'Neill,Gary Sean

PDF Url : ADA119625

Report Date : Jun 1982

Pagination or Media Count : 207

Abstract : The response to uniaxial loading of a graphite epoxy panel containing a one-inch diameter hole was analyzed by finite element analysis and tested experimentally. The analysis modeled the basic unreinforced panel and six different asymmetric reinforcements consisting of additional layers of the same material of circular shape on one side of the panel laminate. The reinforcement configurations varied the volume of the reinforcement from 94% to 162% of the volume of the material removed by the hole, the number of reinforcing layers (1 to 4) and the outer radius of the reinforcement layers from 0.75 inches to 1.5 inches. The orientation of the reinforcing layers was either 45 deg or 0 deg to the load direction. Results of the computational analysis indicated that the reduction of maximum strain (in the direction of the load at a point at the edge of the hole 90 deg from the load direction) by the reinforcements was at most 12%, with apparent dependence on the number of layers used and the volume of the reinforcement.

Descriptors :   *Finite element analysis, *Composite materials, *Strength(Mechanics), Stress concentration, Epoxy compounds, Laminates, Graphite, Reinforcing materials, Holes(Openings), Asymmetry, Isotropism, Stacking, Layers, Stress analysis, Airframes, Contours, Configurations, Theses

Subject Categories : Laminates and Composite Materials
      Numerical Mathematics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE