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A description of preimpregnated roving, where used, and significant advantages are presented, as well as the need for applying standards to the preimpregnated roving material, the fabrication process, and the test methods employed.
Material properties for the application of quality control standards are suggested, including resin content, band width, strand tensile strength, tackiness, and strength in a filament-wound specimen. Specific test methods for these properties are discussed including hydrostatic burst of an open-end cylindrical specimen, a rolling ball tackiness test, and an interlaminar shear test. Data obtained on a high-strength, preimpregnated roving material using an elevated temperature-resistant resin system demonstrate the effect the above properties have on the tensile strength and interlaminar shear strength of filament-wound specimens.
Critical areas in the fabrication process are discussed and their importance as applied to the development of standards is indicated. Data are presented to show the effect of winding tension, and the use of heat during winding on the properties of filament-wound structures. The effects of room-temperature, refrigerated, and deep-freeze temperature storage for up to 6 months are discussed.
A table of suggested quality standards for preimpregnated roving is presented.
Leeds, Maurice A.
Hughes Aircraft Co., Culver City, Calif.