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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >Distributed optical sensing in composite laminates
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Distributed optical sensing in composite laminates

机译：复合层压板中的分布式光学传感

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摘要

An optical fiber-based full-field strain measurement technique was used to investigate delamination growth in laminated composites. An experimental setup to load the test samples under idealized modes of delamination was used to investigate the ability to capture the shape and location of the delamination front. It is envisioned that the demonstrated approach has significant field applications in controlled laboratory settings where delaminations have to be located accurately. Furthermore, the ability of this measurement system to provide full-field strain measurements at any given pre-implanted location through the thickness overcomes the surface strain measurements obtained by digital image correlation. In order to demonstrate the technique, distributed fiber optic sensing is used to monitor the propagation of delaminations under pure mode I and II loading. Optical fibers were embedded one ply from the crack plane of both double cantilever beam and end notch flexure specimens. To establish a repeatable fabrication methodology, manufacturing techniques for embedding the optical fibers during the laminate layup process were established. Specimens with and without embedded fibers were tested to verify the fibers did not affect measured fracture toughness values. Crack lengths measured with the optical fibers compared well with true crack lengths, and measured strain distributions compared well with results from finite element analysis.
机译：基于光纤的全场应变测量技术用于研究层压复合材料中的分层生长。一种用于在理想分层模式下加载测试样品的实验装置用于研究捕获分层前沿的形状和位置的能力。可以预见的是，在必须精确定位分层的受控实验室环境中，已证明的方法具有重要的现场应用。此外，该测量系统在厚度范围内的任何给定预植入位置提供全场应变测量的能力克服了通过数字图像相关获得的表面应变测量。为了演示该技术，使用分布式光纤传感来监视在纯模式I和II加载下的分层传播。光纤从双悬臂梁和端部缺口挠曲样品的裂纹平面一层嵌入。为了建立可重复的制造方法，建立了用于在层压层合过程中嵌入光纤的制造技术。测试了有和没有包埋纤维的样品，以验证纤维不会影响测得的断裂韧性值。用光纤测得的裂纹长度与真实的裂纹长度比较好，测得的应变分布与有限元分析的结果比较好。

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