Accession Number : AD0886154

Title :   New Tensile and Compressive Test Specimens for Unidirectional Reinforced Graphite Epoxy Composites.

Descriptive Note : Technical rept. Aug 68-May 69,

Corporate Author : DAYTON UNIV OH RESEARCH INST

Personal Author(s) : Weidner, John C.

Report Date : FEB 1971

Pagination or Media Count : 22

Abstract : The development of high strength and high modulus fibers for use as reinforcement in resin matrix composites has created problems in the area of mechanical testing. The difficulty appears when unidirectionally reinforced composites are tested in tension or compression using conventional test specimens with the test direction parallel to the fiber direction. Under these conditions failure normally occurs outside the gage section. Two new test specimens developed for determining tensile and compressive properties of unidirectional, graphite reinforced-epoxy composites when loading is parallel to the fiber direction are described. When these specimens were used to evaluate epoxy matrix composites reinforced with Morganite Type II graphite fiber, the failure always occurred in the gage section. (Author, modified-PL)

Descriptors :   (*COMPOSITE MATERIALS, TEST EQUIPMENT), (*REINFORCED PLASTICS, CARBON FIBERS), (*EPOXY RESINS, REINFORCED PLASTICS), TENSILE PROPERTIES, COMPRESSIVE PROPERTIES, GRAPHITE, REINFORCING MATERIALS, STRAIN GAGES, FRACTURE(MECHANICS), LOADS(FORCES), CHROMIUM ALLOYS, STEEL, HEMISPHERICAL SHELLS, BONDING, TEST METHODS, STRAIN(MECHANICS), ALIGNMENT, FAILURE(MECHANICS).

Subject Categories : Laminates and Composite Materials
      Test Facilities, Equipment and Methods
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE