Dynamic young's and shear moduli of graphite fiber-reinforced high-temperature matrix resins

Autor:	T. J. Dudek
Rok vydání:	1970
Předmět:	Timoshenko beam theory Materials science Polymers and Plastics Composite number Modulus General Chemistry Surfaces Coatings and Films Shear (sheet metal) Shear modulus Flexural strength Materials Chemistry Graphite Composite material Polyimide
Zdroj:	Journal of Applied Polymer Science. 14:1939-1947
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.1970.070140803
Popis:	The resonant frequencies of unidirectional graphite fiber-reinforced polyimide (Skybond 703) and polyquinoxaline resin composite beams were determined. The Timoshenko beam theory was employed to compute both the longitudinal Young's modulus (E11) and the effective transverse-longitudinal shear modulus (G12) from the set of resonant frequencies of the beams. E11, E22, and G12 were determined for a 64% by volume Modmor II-reinforced polyimide (Skybound 703) composite, and E11 and G12 were determined for cured and postcured Modmor II-reinforced polyquinoxaline (PQ) composites. Dynamic E11 and E22 results were found to agree with experimentally determined static flexural moduli. Voids present in these high-temperature resin composites to an extent of 5–13% by volume appeared to lower the effective shear and longitudinal moduli of the composites.
Databáze:	OpenAIRE
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