The Buckling of Composite Cylindrical Panels Considering Environmental Effects.
Abstract
An analytical study was conducted to determine the influence of moisture, temperature, and curvature on the bifurcation load of cylindrical, composite panels subjected to a simple shear loading. Two laminate ply orientations, (0/45/-45/90)s and (45/-452)s, were analyzed for six radii, four temperatures, and two initial moisture conditions. The eight-ply composite panels were assumed to be manufactured from a graphite/epoxy, As/3501-5. To evaluate the influence of moisture and temperature, the transverse modulus, E2, and shear modulus, G12, were degraded based on experimental test data for the AS/3501-5 system. Each ply orientation, for a 12 in. panel radius, was evaluated at 20 time/temperature conditions that ranged from 80 to 300 F, and moisture concentrations ranging from a zero moisture content to an equilibrium moisture distribution. The investigation of curvature was conducted only for the (45/-452)s laminate and at a limited number of time/temperature conditions. The bifurcation loads were determined using the STAGS-C1 finite elements shell analysis program. This reduction in the bifurcation load is significantly influenced by the change in curvature at elevated temperatures and moisture content.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1985
- Accession Number
- ADA163878
Entities
People
- Anthony D. Straw
Organizations
- Air Force Institute of Technology