Elkolali Moustafa, Nogueira Liebert Parreiras, Rønning Per Ola, Alcocer Alex
Department of Mechanical, Electronic and Chemical Engineering, Oslo Metropolitan University, 0130 Oslo, Norway.
Department of Biomaterials, Institute of Clinical Dentistry, University of Oslo, 0317 Oslo, Norway.
Polymers (Basel). 2022 Mar 17;14(6):1212. doi: 10.3390/polym14061212.
The properties of composite materials are highly dependent on the fiber and matrix fraction and on the porosity resulting from micro voids. This paper addresses void content characterization and the constituent content of composite materials by resorting to a comparison of destructive and non-destructive methods. The work presents the detailed procedures of two destructive methods, using acid digestion of epoxy resins matrices, and compares their processes. It also presents the results of a non-destructive method, by means of Micro Computed Tomography (MicroCT). The results of both destructive and non-destructive methods are compared, and a recommendation is made based on the application and the type of composite being analyzed. The MicroCT showed better and more consistent results in detecting voids in the material, while the acid digestion tests provided better results about the fiber and matrix percentage. Exported results from the MicroCT scanning with actual locations of voids were used in numerical analysis, to examine the feasibility of using them, whether by developing models that map damage in the proximity of the void, or by developing models that predict the properties of the entire material with respect to the content, shape, and distribution in the material.
复合材料的性能高度依赖于纤维和基体的比例以及由微孔隙导致的孔隙率。本文通过比较破坏性方法和非破坏性方法来探讨复合材料的孔隙含量表征和成分含量。这项工作展示了两种破坏性方法的详细步骤，即使用酸消解环氧树脂基体，并比较了它们的过程。还展示了一种非破坏性方法——微计算机断层扫描（MicroCT）的结果。比较了破坏性方法和非破坏性方法的结果，并根据应用和所分析复合材料的类型给出了建议。MicroCT在检测材料中的孔隙方面显示出更好且更一致的结果，而酸消解测试在纤维和基体百分比方面提供了更好的结果。带有孔隙实际位置的MicroCT扫描导出结果被用于数值分析，以检验使用它们的可行性，无论是通过开发描绘孔隙附近损伤的模型，还是通过开发预测整个材料相对于其在材料中的含量、形状和分布的性能的模型。
