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Evaluation of GRP Rod and Rope Materials and Associated End Fittings.
NATIONAL BUREAU OF STANDARDS WASHINGTON D C INST FOR BASIC STANDARDS
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An extensive and varied test program was carried out on FRPepoxy and FRPpolyester rod and rope materials to evaluate tensile strengths, moduli of elasticity, flexibility at low temperatures, effects of simulated Aeolian vibration, and stress-rupture properties at moderate elevated temperatures both with and without high humidity. The effects of elevated temperature on long-term storage capabilities were investigated, and diameter-temperature relationships were established for avoiding buckling due to storage in a coiled condition. The performances of five commercially available end fittings on these materials were examined in terms of the breaking loads attained in tensile tests. Using finite- element analyses, an improved end fitting was developed. With this end fitting the strength of the fitting-specimen system approaches the true tensile strength of the specimen for two of the FRP materials. An experimental stress analysis of the improved fitting was performed. Author-PL
APPROVED FOR PUBLIC RELEASE