NASA TN D-5050 MECHANICAL BEHAVIOR OF BORON-EPOXY AND GLASS-EPOXY FILAMENT-WOUND CYLINDERS UNDER VARIOUS LOADS (original) (raw)

A study was made to determine the mechanical behavior of boron-epoxy and S-glass-epoxy filament-wound cylinders under tensile, compressive, torsional, and pressure loads. These cylinders were fabricated in either an orthotropic winding pattern or an isotropic pattern. Conventional theory used to predict the elastic behavior of glassepoxy filament-wound cylinders was discovered to be equally adequate for the boronepoxy cylinders. Since Young's modulus for a boron filament is much greater than that for a glass filament , the boron-epoxy cylinders were considerably stiffer than those of glass-epoxy. Atte mpts to correlate cylinder failure strengths calculated from existing state-of-the-art theories with experimental failure strengths met with varying success. Thus, additional research is necessary before failure characteristics of filament-wound composite cylinders, either glass-or boron-reinforced can be accurately predicted.