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This paper describes some of the problems encountered in determining the tensile and flexural strengths of uniaxially aligned glass fiber-resin composites by conventional methods, and suggests alternative procedures for overcoming them. Special emphasis is placed on the effects of test specimen geometry with respect to these properties and equations are developed for the stress-strain properties of half-round, pultruded rods subjected to ordinary bending, assuming elastic behavior.
In addition, measurements carried out on flat, unidirectional moldings are described, which show a linear relationship between the tensile and flexural strengths of these composite materials.
Supervisor, Plastics Testing Laboratory, PPG Industries, Inc., Fiber Glass Division, Testing and Evaluation Laboratory, Shelby, N.C.
Stock #: JTE11541J