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Embedded Bragg grating fiber optic sensor for composite flexbeams

机译：用于复合柔性的嵌入式布拉格光栅光纤传感器

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translaminar embedded fiber optic sensor system to monitor the structural integrity of composites has been developed. The focus of this development is the future application of the technology to composite helicopter flexbeams. These flexbeams are currently under development for use in bearingless main rotor hubs for military helicopters. This through thickness strain sensor system is far more sensitive than conventional in-plane embedded fiber optic sensors to ply delamination - the principal failure mode in composite flexbeams. The system was developed by combining Foster-Miller's unique fiber insertion technology with novel Bragg grating fiber optic sensors developed by United Technologies Research Center. The novel insertion technique minimized any possible negative impact of the sensors on the structural properties of the composite specimens tested. This will be important in application of the technology to helicopter flexbeams. This series of experiments has demonstrated that the embedded delamination sensors can be used to detect potential failures in advance of the edge delamination or crack propagation event. Delamination is a predominant failure mode in polymer matrix composites due the relatively low interlaminar strength of these materials. As a diagnostic device the through thickness sensor can provide the designer with not previously possible through thickness stress and strain data. This new sensing technique would have broad usefulness for interlaminar stress measurement in composite structures for helicopters, fixed wing aircraft, missiles, and submarines.
机译：摇译嵌入式光纤传感器系统要监控复合材料的结构完整性。该开发的重点是将技术应用于复合直升机柔性纤维弹束。这些Flexbeam目前正在开发开发中，用于军用直升机的无轴承主转子集线器。这通过厚度应变传感器系统比传统的内嵌式嵌入式光纤传感器更敏感到Ply Demination - 复合柔性光束中的主体故障模式。该系统是通过将Foster-Miller独特的纤维插入技术与ComeNed Technologies Research Center开发的新型布拉格光栅光纤传感器相结合而开发。新型插入技术最小化了传感器对测试的复合样本的结构性质的任何可能的负面影响。这对于将技术应用于直升机FlexBeams，这将是重要的。该系列实验表明，嵌入的分层传感器可用于在边缘分层或裂纹传播事件的前提中检测电位故障。分层是由于这些材料的相对低的间隔强度，聚合物基质复合材料中的主要失效模式。作为诊断装置，贯通厚度传感器可以提供设计者，以通过厚度应力和应变数据提供不可能。这种新的传感技术将对直升机，固定翼飞机，导弹和潜艇的复合结构中的层间应力测量具有广泛的有用性。

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