Tutorial for Collecting and Processing Images of Composite Structures to Determine the Fiber Volume Fraction
Tutorial for Collecting and Processing Images of Composite Structures to Determine the Fiber Volume Fraction
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收集和处理复合结构图像以确定纤维体积分数的教程
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
L. Conklin
中科院分区：
文献类型：
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作者：
L. Conklin
纤维增强复合材料结构由于其重量轻和结构效率高，在航空航天部件中越来越普遍。一般来说，复合材料结构的强度和刚度与纤维体积分数直接相关，纤维体积分数定义为纤维体积占复合材料总体积的比例。测定纤维体积分数最常用的方法是酸消化法，当复合材料的总质量、纤维质量和总质量容易得到时，酸消化法是一种有用的方法。然而，酸消化是一种破坏性的测试，因此该材料将不再可用于额外的表征。酸消化也很难加工出具有复杂几何形状的复合结构的特定部件。由于酸消化的这些缺点，作者提出了一种计算纤维体积分数的方法。该方法利用光学显微镜根据复合材料的横截面图像计算纤维面积分数。基于纤维的形状和尺寸在复合材料的深度上一致的假设，纤维面积分数和纤维体积分数可以理解为相同。本教程介绍了在美国宇航局兰利研究中心进行的光学测定光纤面积分数的开发方法。
Fiber-reinforced composite structures have become more common in aerospace components due to their light weight and structural efficiency. In general, the strength and stiffness of a composite structure are directly related to the fiber volume fraction, which is defined as the fraction of fiber volume to total volume of the composite. The most common method to measure the fiber volume fraction is acid digestion, which is a useful method when the total weight of the composite, the fiber weight, and the total weight can easily be obtained. However, acid digestion is a destructive test, so the material will no longer be available for additional characterization. Acid digestion can also be difficult to machine out specific components of a composite structure with complex geometries. These disadvantages of acid digestion led the author to develop a method to calculate the fiber volume fraction. The developed method uses optical microscopy to calculate the fiber area fraction based on images of the cross section of the composite. The fiber area fraction and fiber volume fraction are understood to be the same, based on the assumption that the shape and size of the fibers are consistent in the depth of the composite. This tutorial explains the developed method for optically determining fiber area fraction performed at NASA Langley Research Center.