Evaluation of Hoop Strength of Filament-Wound Cylinders By Newly-Proposed ISAS Ring Test and Burst Test

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The ISAS ring test, come of INSTITUTE OF SPACE AND AERONAUTICAL SCIENCE, is newly proposed to have a quick evaluation of hoop strength of filament-wound cylinders with arbitrary winding pattern, and the width variation effects are investigated. The obtained ISAS ring test values are roughly coincident with the usual hydraulic burst hoop strength, in general. The present evaluation of filament-wound cylinders through the ISAS ring test shows : 1) 50 to even 70Kg/mm^2 hoop stress, 2) the winding pattern has a close relation with the strength, 3) the 2-to-1 orthogonal winding pattern gives the higher hoop strength than those obtained for the optimum 54.75°by about 22%, and 4) the strength is quite sensitive to the surface treatment of glass-filament.
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