BEHAVIOR OF FIBER REINFORCED PLASTIC LAMINATES UNDER UNIAXIAL, BIAXIAL, AND SHEAR LOADINGS

A series of mechanical tests was conducted on fiber glass-epoxy laminates. The loadings used were uniaxial tension; biaxial tension with principal-stress ratios of 1:2, 1:1, and 2:1; and pure shear. The most unique tests were those involving the biaxial loadings. These tests were carried out on a sp...

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Bibliographic Details
Main Authors: Bert, Charles W, Mayberry, Byron L, Ray, John D
Format: Report
Language:English
Subjects:
COMPOSITE MATERIALS
EPOXY RESINS
FIBERGLASS REINFORCED PLASTICS
GLASS TEXTILES
GRAPHITE
ISOTROPISM
LAMINATED PLASTICS
Laminates and Composite Materials
LOADS(FORCES)
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
Mechanics
REINFORCED PLASTICS
SHEAR STRESSES
STRAIN GAGES
STRESSES
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Summary:A series of mechanical tests was conducted on fiber glass-epoxy laminates. The loadings used were uniaxial tension; biaxial tension with principal-stress ratios of 1:2, 1:1, and 2:1; and pure shear. The most unique tests were those involving the biaxial loadings. These tests were carried out on a specially designed test fixture using a cable-pulley system in conjunction with a conventional universal testing machine. Data were obtained on the limit strength and apparent ultimate strength of flat laminates subjected to biaxial loading. Under biaxial loading, the parallel-ply lamination arrangement was found to be slightly superior to the cross-ply lamination arrangements. The shear tests were accomplished on thin-walled tubular specimens subjected to pure torsion.