Accelerated characterization of fiber/epoxy composites. Part I. Viscoelastic methods. Final report, 1 Jul 1972--30 Sep 1974

Technical Report · Fri Jan 31 23:00:00 EST 1975

OSTI ID:7347923

Thakker, A B; Brinson, H F; Heller, R A

Time dependent properties of angle ply laminated boron/epoxy and graphite/epoxy fiber controlled composites were investigated. The main objective of this study was to develop a technique to establish interconversion of different test results using appropriate viscoelastic theory to formulate an accelerated testing procedure. To achieve this aim, forced vibration, constant strain rate and creep tests were performed at different temperature levels. Multiple regression techniques were used to generate response surfaces for significant variables. Master curves using the time-temperature superposition principle were established for individual tests. Mechanical model representation, integral equation formulation and numerical integration methods based on linear viscoelasticity were used to predict constant strain rate and long time creep behavior of composites from nondestructive short time dynamic tests. (GRA)

• Research Organization: Virginia Polytechnic Inst. and State Univ., Blacksburg (USA). Dept. of Engineering Science and Mechanics
• OSTI ID: 7347923
• Report Number(s): AD-A-014266
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360303* -- Composite Materials-- Mechanical Properties-- (-1987)
BORON
CARBON
COMPOSITE MATERIALS
CREEP
ELASTICITY
ELEMENTS
EPOXIDES
FIBERS
GRAPHITE
MATERIALS TESTING
MECHANICAL PROPERTIES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
SEMIMETALS
STRAINS
TENSILE PROPERTIES
TESTING
TIME DEPENDENCE