Strain monitoring in thermoplastic composites with optical fiber sensors: Embedding process, visualization with micro-tomography, and fatigue results
Strain monitoring in thermoplastic composites with optical fiber sensors: Embedding process, visualization with micro-tomography, and fatigue results
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DOI：
10.1177/0892705707082325
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发表时间：
2007-09-01
影响因子：
3.3
通讯作者：
Degrieck, J.
中科院分区：
文献类型：
--
作者：
De Baere, I.;Voet, E.;Degrieck, J.
本研究探讨使用光纤与布拉格光栅疲劳载荷条件下的测量的可能性。详细的信息给出了光纤测量的原理，嵌入过程，和疲劳试验。为了验证来自光纤的应变，将应变与引伸计测量进行比较。一个特殊的设计的引伸计的刀片，因为标准的刀片遭受从试样表面上的抓地力损失。此外，X射线显微层析成像的讨论和用于可视化的光纤和复合材料中的损伤。本研究所用的材料是碳纤维增强聚苯硫醚。可以得出结论，光纤经受50多万次负载循环，而没有光纤的脱粘。此外，显微断层扫描的分辨率足够高，不仅可以看到光纤，还可以看到材料中的损伤。
This study investigates the possibility of using optical fibers with Bragg gratings for measurements under fatigue loading conditions. Detailed information is given on the principle of optical fiber measurements, the embedding process, and the fatigue tests. To verify the strain derived from the optical fiber, the strain is compared with extensometer measurements. A special design of the blades of the extensometer is presented, since the standard blades suffer from a loss of grip on the surface of the specimen. Furthermore, X-ray micro-tomography is discussed and used for the visualization of the optical fibers and damage in the composite material. The material used for this study is a carbon fiber- reinforced polyphenylene sulfide. It can be concluded that the optical fiber survives over half a million loading cycles, without de-bonding of the fiber. Furthermore, the resolution of the micro-tomography is high enough to visualize not only the optical fiber, but also damage in the material.