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首页> 外文期刊>NDT & E International: Independent Nondestructive Testing and Evaluation >Residual strain-induced birefringent FBGs for multi-axial strain monitoring of CFRP composite laminates
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Residual strain-induced birefringent FBGs for multi-axial strain monitoring of CFRP composite laminates

机译：残余应变感应双折射FBG用于CFRP复合材料层压板的多轴应变监测

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摘要

Several solutions to measure multi-axial strain in composite materials using fibre Bragg gratings have already been presented in the literature. Most of them use Bragg sensors written in highly birefringent fibres. Unless they exhibit a higher transverse strain sensitivity, a major drawback of those highly birefringent Bragg sensors is the necessity to orient them before embedding them into the composite material, because otherwise an underestimation of the present strain field can occur. Therefore, in this paper we describe how the residual strain, which is built up during the cure cycle of a composite laminate, can in-situ create a highly birefringent fibre Bragg sensor making the need of extra manipulations before embedding redundant. Consequently, in the paper this Bragg sensor is used to quantitatively measure multi-axial strain fields of cross-ply laminates loaded along their three principal mechanical axes. Good similarities were found for the measured strains and the reference strains.
机译：文献中已经提出了几种使用光纤布拉格光栅测量复合材料中多轴应变的解决方案。他们中的大多数使用以高双折射纤维编写的布拉格传感器。除非它们表现出较高的横向应变敏感性，否则那些高双折射布拉格传感器的主要缺点是必须在将它们嵌入复合材料中之前对其进行定向，因为否则可能会低估当前的应变场。因此，在本文中，我们描述了在复合层压板的固化周期中累积的残余应变如何能够原位创建高双折射光纤布拉格传感器，从而在嵌入冗余之前需要进行额外的处理。因此，在本文中，该布拉格传感器用于定量测量沿其三个主要机械轴加载的交叉层压板的多轴应变场。发现所测菌株与参考菌株具有良好的相似性。

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