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首页> 美国政府科技报告 >Investigation of Methods for Evaluating Unwoven Glass-Fiber-Reinforced Plastic Laminates in Flexure.
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Investigation of Methods for Evaluating Unwoven Glass-Fiber-Reinforced Plastic Laminates in Flexure.

机译：柔性无纺玻璃纤维增​​强塑料层压板评价方法研究。

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Three plastic laminates reinforced with unwoven, unidirectional glass fibers were evaluated over varying spans under both midpoint and two-point loading in an effort to adapt or improve presently accepted flexure test procedures for these materials. nose, length of overhang, and different two-point loading systems on properties of 1/8-inch laminates. Also investigated were the effects of radius of loading The results of these evaluations have indicated that present test methods for reinforced plastics often result in failures that do not accurately evaluate the outer fiber strength of the material. values are lower than would be expected if true outer fiber failures had occurred. Consequently, modulus of rupture It was found that horizontal shear failures could be eliminated by using a specimen with a span-depth ratio greater than 16. For a long specimen, however, a correction factor must be applied to the conventional moment expression to include the effect of horizontal components of force at the reaction supports. Compression failures beneath the load points were eliminated either by using a 0.01-inch-thick metal plate beneath a loading nose of 1/8-inch radius, increasing the loading nose radius, or increasing the specimen span-depth ratio.

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