Accession Number : ADA304424
Title : Tensile Stress-Strain Behavior of Graphite/Epoxy Laminates.
Descriptive Note : Contractor rept.,
Corporate Author : KENTRON INTERNATIONAL INC HAMPTON VA
Personal Author(s) : Garber, Donald P.
PDF Url : ADA304424
Report Date : AUG 1982
Pagination or Media Count : 98
Abstract : The tensile stress-strain behavior of a variety of graphite/epoxy laminates was examined. Longitudinal and transverse specimens from eleven different layups were monotonically loaded in tension to failure. Ultimate strength, ultimate strain, and stress-strain curves were obtained from four replicate tests in each case. Polynominal equations were fitted by the method of least squares to the stress-strain data to determine average curves. Values of Young's modulus and Poisson 5 ratio, derived from polynomial coefficients, were compared with laminate analysis results. While the polynomials appeared to accurately fit the stress-strain data in most cases, the use of polynomial coefficients to calculate elastic moduli appeared to be of questionable value in cases involving sharp changes in the slope of the stress-strain data or extensive scatter. (MM)
Descriptors : *STRESS STRAIN RELATIONS, *EPOXY LAMINATES, *GRAPHITE EPOXY COMPOSITES, LAMINATES, TENSILE STRESS, STIFFNESS, FIBER REINFORCED COMPOSITES, MODULUS OF ELASTICITY, MOISTURE CONTENT, VOIDS, DEFECTS(MATERIALS), LEAST SQUARES METHOD, POISSON RATIO, SHEAR STRENGTH.
Subject Categories : Laminates and Composite Materials
Distribution Statement : APPROVED FOR PUBLIC RELEASE