Comparing non-destructive 3D X-ray computed tomography with destructive optical microscopy for microstructural characterization of fiber reinforced composites
Comparing non-destructive 3D X-ray computed tomography with destructive optical microscopy for microstructural characterization of fiber reinforced composites
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DOI：
10.1016/j.compscitech.2019.107843
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发表时间：
2019-11-10
影响因子：
9.1
通讯作者：
Sangid, Michael D.
中科院分区：
文献类型：
--
作者：
Hanhan, Imad;Agyei, Ronald;Sangid, Michael D.
由于它们的轻巧，相对较高的刚度和形成复杂形状的形状，不连续的纤维复合材料对于生产中小型组件是有利的。为了采用基于模型的方法来评估其结构完整性，需要改进的表征技术和后处理方法才能更可靠地量化微观结构和缺陷分布。这项工作比较了一种非破坏性X射线方法和一种破坏性的光学显微镜方法，用于表征显微结构属性，特别是纤维体积分数，孔隙率体积分数，纤维方向分布以及在聚光基元基质中不连续玻璃纤维的不连续玻璃纤维的长度分布。此外，包括一种用于确定方向张量的模棱两可的组件（与大型表面区域上破坏性横截面切割中脱离平面角度的符号歧义有关）的方法。发现纤维体积分数和平均纤维纵横比良好，而纤维取向和孔隙率检测的差异很小但显着。对每种技术的检测能力的差异进行了量化，并讨论阐明了每种方法的特定优点和缺点，并使工程师能够量化其微观结构表征测量的不确定性，尤其是与模型的结构完整性活动有关。
Due to their lightweight, relatively high stiffness properties, and formability into complex shapes, discontinuous fiber composites are advantageous for producing small and medium size components. Improved characterization techniques and post-processing methodologies are required for more reliable quantification of the microstructure and defect distributions in these materials, in order to employ model-based approaches to assess their structural integrity. This work compares a non-destructive X-ray approach with a destructive optical microscopy approach for characterizing the microstructural attributes, specifically the fiber volume fraction, porosity volume fraction, fiber orientation distribution, and fiber length distribution of discontinuous glass fibers in a polypropylene matrix. Additionally, a method for destructively determining the ambiguous components of the orientation tensor (related to the sign ambiguity of the out-of-plane angle in a destructive cross-sectional cut of a fiber) over a large surface area is included. It was found that fiber volume fraction and average fiber aspect ratio matched well, while fiber orientation and porosity detection had small but notable differences. The differences in the detection capabilities of each technique are quantified and discussed shedding light on the specific advantages and disadvantages of each approach, and enabling engineers to quantify uncertainty in their microstructural characterization measurements especially as they relate to model based structural integrity activities.