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首页> 外文期刊>Journal of engineering materials and technology >Effect of Fiber Content on Void Morphology in Resin Transfer Molded E-Glass/Epoxy Composites
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Effect of Fiber Content on Void Morphology in Resin Transfer Molded E-Glass/Epoxy Composites

机译：纤维含量对树脂传递模塑电子玻璃/环氧树脂复合材料中空隙形态的影响

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摘要

Effect of fiber volume fraction on occurrence, morphology, and spatial distribution of microvoids in resin transfer molded E-glass/epoxy composites is investigated. Three disk-shaped center-gated composite parts containing 8, 12, and 16 layers of randomly-oriented, E-glass fiber perform are molded, yielding 13.5%, 20.5%, and 27.5% fiber volume fractions. Voids are evaluated by microscopic image analysis of the samples obtained along the radius of these disk-shaped composites. The number of voids is found to decrease moderately with increasing fiber content. Void areal density decreased from 10.5 voids/mm~2 to 9.5 voids/ mm~2 as fiber content is increased from 13.5% to 27.5%. Similarly, void volume fraction decreased from 3.1% to 2.5%. Increasing fiber volume fraction from 13.5% to 27.5% is found to lower the contribution of irregularly-shaped voids from 40% of total voids down to 22.4%. Along the radial direction, combined effects of void formation by mechanical entrapment and void mobility are shown to yield a spatially complex void distribution. However, increasing fiber content is observed to affect the void formation mechanisms as more voids are able to move toward the exit vents during molding. These findings are believed to be applicable not only to resin transfer molding but generally to liquid composite molding processes.
机译：研究了纤维体积分数对树脂转移模塑电子玻璃/环氧树脂复合材料中微孔的出现，形态和空间分布的影响。模制三个包含8层，12层和16层随机取向的E型玻璃纤维的圆盘状中心浇口复合部件，可得到13.5％，20.5％和27.5％的纤维体积分数。通过对沿这些盘状复合材料的半径获得的样品的显微图像分析来评估空隙。发现空隙的数量随着纤维含量的增加而适度减少。随着纤维含量从13.5％增加到27.5％，空隙面密度从10.5个/ mm〜2降低到9.5个/ mm〜2。同样，空隙体积分数从3.1％降低至2.5％。发现纤维体积分数从13.5％增加到27.5％，可以将不规则形状的空隙的贡献从总空隙的40％降低到22.4％。沿径向方向，通过机械截留形成的空隙和空隙迁移率的综合效果显示出空间复杂的空隙分布。然而，观察到纤维含量的增加会影响空隙的形成机理，因为在模制过程中，更多的空隙能够移向出口。这些发现被认为不仅适用于树脂传递模塑，而且通常适用于液体复合模塑过程。

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