Accession Number : ADA302653

Title :   Study of the Influence of Hole Quality on Composite Materials.

Descriptive Note : Contract rept.,

Corporate Author : LOCKHEED-CALIFORNIA CO BURBANK

Personal Author(s) : Pengra, J. J.

PDF Url : ADA302653

Report Date : FEB 1980

Pagination or Media Count : 82

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.

Descriptors :   *HOLES(OPENINGS), *GRAPHITE EPOXY COMPOSITES, THICKNESS, TENSILE STRENGTH, NONDESTRUCTIVE TESTING, FATIGUE LIFE, STRUCTURAL PROPERTIES, HIGH TEMPERATURE, COMPOSITE STRUCTURES, BEARING STRENGTH, DEFECTS(MATERIALS), SURVEYS, TENSION, EPOXY LAMINATES, QUALITY CONTROL, AIRFRAMES, PATTERNS, COMPRESSIVE STRENGTH, DELAMINATION, STATIC TESTS, FATIGUE TESTS(MECHANICS), CYCLIC LOADS, CYCLIC TESTS, SHEAR TESTS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE