Characterization of Fiber Volume Fraction Gradients in Composite Laminates
Characterization of Fiber Volume Fraction Gradients in Composite Laminates
复制标题
复合材料层压板中纤维体积分数梯度的表征
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
C. Schneider
中科院分区：
文献类型：
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作者：
M. Cann;D. Adams;C. Schneider
评估了准确表征纤维增强复合材料层压板中全厚度纤维体积分数梯度的实验方法。为此考虑了两种基于光学显微镜的图像分析方法：面积法和纤维计数法。尽管面积法目前似乎是更常用的方法，但当可以精确测量纤维横截面积时，纤维计数方法被确定为首选的基于光学显微镜的方法。在此测定的基础上，使用纤维计数方法对四组高压釜固化的碳/环氧树脂单向和对称交叉层压板进行逐层纤维体积分数测定。尽管所有四种层压材料在固化后均表现出面外曲率，但在任何层压材料中均未发现统计上显着的全厚度纤维体积分数梯度。
Experimental methods were assessed for accurately characterizing through-the-thickness fiber volume fraction gradients in fiber-reinforced composite laminates. Two optical microscopy-based image analysis methods were considered for this purpose: the areal method and the fiber counting method. Although the areal method currently appears to be the more commonly used method, the fiber counting method was determined to be the preferred optical microscopy-based method when an accurate measure of fiber cross-sectional area is available. Based on this determination, the fiber counting method was used to perform ply-by-ply fiber volume fraction determinations on four sets of autoclave-cured carbon/ epoxy unidirectional and symmetric cross-ply laminates. Although all four laminates displayed out-of-plane curvature following curing, no statistically significant through-the-thickness fiber volume fraction gradient was found in any of the laminates.