Time-dependent mechanical properties of 3-D braided graphite/PEEK composites

Journal Article · Wed Jul 01 00:00:00 EDT 1992 · SAMPE Quarterly (Society of Aerospace Material and Process Engineers); (United States)

OSTI ID:7241878

Chu, J N; Ko, F K ^[1]; Song, J W ^[2]

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1. Drexel Univ., Philadelphia, PA (United States)
2. Army Natick Research, Development and Engineering Center, Natick, MA (United States)

Poly(ether-ether-ketone) or PEEK, was developed as a high performance engineering material. In this study, 3-D braided AS4 graphite /PEEK (graphite/PEEK) composites were preformed and processed to investigate the combined performance of this new system. These manufactured composites were then characterized, using matrix digestion and wide angle x-ray diffraction, to determine their fiber volume fractions and degrees of crystallinity. After physical characterization, the mechanical response of these composites were evaluated at various temperatures. Experimental results from tensile measurements are compared to a fabric geometry model (FGM). This model predicts tensile strength based upon fiber and matrix properties, fiber volume fraction, and braiding angle. The model and experimental results are given here, and are in good agreement with each other. In order to study the time-dependent mechanical properties of these 3-D braided graphite/PEEK composites, their stress relaxation and dynamic mechanical properties were evaluated. The dynamic mechanical properties of PEEK composites are compared to short fiber and continuous fiber reinforced PEEK composites to determine the effects of fiber geometry.

• OSTI ID: 7241878
• Journal Information: SAMPE Quarterly (Society of Aerospace Material and Process Engineers); (United States), Vol. 23:4; ISSN 0036-0821
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON FIBERS
MECHANICAL PROPERTIES
COMPOSITE MATERIALS
KETONES
POLYMERS
CRYSTAL STRUCTURE
DENSITY
GEOMETRY
GRAPHITE
HOT PRESSING
MATRIX MATERIALS
PHYSICAL PROPERTIES
POISSON RATIO
QUANTITY RATIO
REINFORCED MATERIALS
SCANNING ELECTRON MICROSCOPY
STRESS RELAXATION
TENSILE PROPERTIES
TIME DEPENDENCE
X-RAY DIFFRACTION
CARBON
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTAL MINERALS
ELEMENTS
FABRICATION
FIBERS
MATERIALS
MATERIALS WORKING
MATHEMATICS
MICROSCOPY
MINERALS
NONMETALS
ORGANIC COMPOUNDS
PRESSING
RELAXATION
SCATTERING
360603* - Materials- Properties