Study of the Influence of Hole Quality on Composite Materials.
Abstract
The objectives of this report are to present the test data generated during the experimental investigation of holes of various quality levels in graphite/epoxy composites and, by evaluation of these test data, to develop meaningful accept/reject criteria for holes in graphite/epoxy composites. Fabricated from T300/5208 material the specimens tested were 3.05 mm (0.120 in.) and 4.32 mm (0.170 in.) thick, typical of airframe rib structure and thick cover areas. The thinner 3.05 mm specimens were laid up in a quasi isotropic (45, 0, -45, 902, -45, 0, 45)3 pattern and the thicker 4.32 mm specimens were laid up in a (+/- 45, 0, +/- 45, 90(2), +/- 45 sub 2, 02)S pattern. A 4.76 mm (3/16 in.) diameter hole was selected for this investigation because it is representative of a size commonly used in airframe construction.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1980
- Accession Number
- ADA302653
Entities
People
- J. J. Pengra
Organizations
- Lockheed Martin