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原文传递 FINGER MATERIALS FOR AIR CUSHION VEHICLES VOLUME II: BASE FABRICS FOR FINGER MATERIALS

题名：	FINGER MATERIALS FOR AIR CUSHION VEHICLES VOLUME II: BASE FABRICS FOR FINGER MATERIALS
作者：	Meredith M. Schoppee, John Skelton, Mary M. Toney, and William Klemens
关键词：	Surface Effect Vehicles, Hovercraft, Skirt Materials, Rubber-Coated Fabrics, Rubber/Fabric Composites, Fabric Substrate, Fabric Design Flex-Fatigue, Flex Cycling, Flex-Testing, Tensile Strength, Tear Strength, Peel Strength Flexural Rigidity Fiber Denier, Yarn Denier, Yarn Twist, Yarn Crimp, Weave Pattern, Float Length'._
摘要：	The short lifetimes of seal/skirt systems on surface effect vehicles (SEV's) severely limit the long-term serviceability of such crafty Therefore, a systematic study was undertaken to evaluate the effects of fabric structure on the performance of rubber/fabric skirt materials under conditions of highspeed, high-curvature flexing. A series of nylon fabrics was designed and manufactured in which the fiber denier, yarn denier, yarn, twist, yarn crimp, weave pattern and float length were varied, but in which the tensile strength was kept constant throughout. Each of the fabrics was rubber-coated using, the same natural rubber/polybutadiene blend and the same coating technique. A flex-testing apparatus was 4peciaU^ designed and built for flexing the rubber/fabric composite materials in air at an average radius of curvature of 0.28 in. at a cycling frequency of 15 Hz. The lifetimes in flex of the experimental series of fabrics, as indicated by the appearance of flex cracks in the rubber layer, ranged from a low of 140,000 cycles to a high of 21.7 million cycles, a range of over two orders of magnitude, A factorial analysis of the test results showed that lower yarn denier, lower yarn crimp, and shorter float length (plain-weave) in the fabric substrate offer significant advantages in the ability of the fabric to withstand flexing. The design of three broad fabrics for -full-scale skirt trials on the SRN4 craft is described, and recommendations are given for the design of future fabrics.
报告类型：	科技报告