Mechanical behavior of laminated composites at elevated temperatures

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:7202700

Ha, S K

Models are presented for describing the stress-strain relationships of thermoset matrix composites exposed to elevated temperatures. The models describe both elastic and inelastic material behavior. Tests were performed to determine the constants required in the models. The constants for the time-independent, nonlinearly elastic stress relationships of Fiberite 976 resin and Fiberite T300/976 graphite epoxy composite were obtained by measuring the tensile, compressive, and shear properties and the Poisson ratios at 75, 250, 300, and 350{degree}F. The constants for the time-dependent inelastic stress-strain relationships of Fiberite T300;/976 composite were determined from data obtained in four-point bend tests from 75 to 350{degree}F. Simple expressions are presented for calculating the strengths, initial moduli, and initial Poisson ratios of pure resins and of laminated composites at high temperatures. A procedure is also described which, together with the stress-strain models, can be used to calculate the stresses and strains in loaded, high-temperature multidirectional laminates. Experimental data were compared to results calculated by the models, and good agreements were found.

• Research Organization: Stanford Univ., CA (USA)
• OSTI ID: 7202700
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CARBON
COMPOSITE MATERIALS
ELEMENTAL MINERALS
ELEMENTS
EPOXIDES
GRAPHITE
HIGH TEMPERATURE
MATERIALS
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
MINERALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
POISSON RATIO
POLYMERS
RESINS
STRAINS
STRESS ANALYSIS