Accession Number : ADA309239

Title :   The Interlaminar Fracture Toughness of Woven Graphite/Epoxy Composites.

Descriptive Note : Technical paper,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Funk, Joan G. ; Deaton, Jerry W.

PDF Url : ADA309239

Report Date : NOV 1989

Pagination or Media Count : 29

Abstract : The interlaminar fracture toughness of graphite/ epoxy woven composites was determined as a function of stacking sequence, thickness, and weave pattern. Plain, oxford, 5-harness satin, and 8-harness satin weave patterns of T300/934 fabric were evaluated by the double cantilever beam test. The fabric had a mode I critical-strain-energy release rate (G sub Ic) ranging from two to eight times greater than that of a 0 deg unidirectional T300/934 tape material. The interlaminar fracture toughness of a particular weave pattern was dependent on whether the stacking sequence was symmetric or asymmetric and, in some cases, on the fabric orientation.

Descriptors :   *TOUGHNESS, *FRACTURE(MECHANICS), *GRAPHITE EPOXY COMPOSITES, LAMINATES, IMPACT TESTS, FIBER REINFORCED COMPOSITES, ORIENTATION(DIRECTION), RUBBER, STRAIN RATE, FABRICS, THERMOPLASTIC RESINS, WEAVING, CANTILEVER BEAMS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE