Highly attenuating tracer fibers for fiber orientation determination in short-fiber-reinforced plastics
Due to their high specific stiffness and strength by low production costs short fiber reinforced plastics (sFRP) replace increasingly common materials like steel or aluminum in technical devices. Even if sFRP act homogeneously as a material on a macroscopic level, anisotropies are formed on a micr...
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| Main Authors: | , |
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| Format: | Article |
| Language: | deu |
| Published: |
NDT.net
2025-02-01
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| Series: | e-Journal of Nondestructive Testing |
| Online Access: | https://www.ndt.net/search/docs.php3?id=30728 |
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| Summary: | Due to their high specific stiffness and strength by low production costs short fiber reinforced plastics (sFRP) replace increasingly common materials like steel or aluminum in technical devices. Even if sFRP act homogeneously as a material on a macroscopic level, anisotropies are formed on a microscopic level due to the fiber morphology (orientation, length and volume content). As a result, components made from sFRP have lower strength and stiffness at weld lines or differences in the thickness, which can lead to component failure. Therefore, knowledge of the fiber morphology in a sFRP is essential for the design of components. One way to determine the fiber morphology is computed tomography (CT). Due to the small fiber diameters of a few micrometers (~7-20 μm), the field of view of the tomography is reduced because of the necessary high magnification. As a result, standard CT systems can only be used to examine representative, destructively obtained samples from the component and fiber morphology of components with larger volumes cannot be analyzed non destructively. In this work, an approach is investigated in which a small amount of strongly attenuating tracer fibers is added to the reinforcing fibers in the plastic, resulting in an increase in the contrast-to-noise ratio. This allows the geometric magnification to be reduced and a larger field-of-view to be achieved.
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| ISSN: | 1435-4934 |