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首页> 外文期刊>Journal of Nondestructive Evaluation >Acoustic Emission Characterisation of Failure Modes in Hemp/Epoxy and Glass/Epoxy Composite Laminates
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Acoustic Emission Characterisation of Failure Modes in Hemp/Epoxy and Glass/Epoxy Composite Laminates

机译：大麻/环氧树脂和玻璃/环氧树脂复合层压板的破坏模式的声发射表征

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摘要

Acoustic emission (AE) can be used for online monitoring of composite structures. One of the main issues of using composite structures in various applications is to understand and characterize their failure mechanisms. In this paper, advanced signal processing technique is used to discriminate the failure mechanisms in hemp/epoxy and glass/epoxy composite laminates. Hemp/Epoxy laminates are made from 4 layers of chopped non-woven fiber mats and glass/epoxy cross ply laminates [ 0/90/90/0](3s) are made from 12 layers of unidirectional glass fiber mats. ASTM standard specimens of size 100x20x4 mm were cut from the laminates. These specimens are subjected to flexural loading with AE monitoring. The choice of the AE signals for failure mode characterisation were obtained using parametric analysis of AE data such as counts rate and cumulative counts at different levels of loading. Wavelet decomposition was performed on the chosen AE signals to identify the percentage of energy and frequency content of each level which correlate the different failure modes. The studies reveal that wavelet decomposition of AE signals plays a significant role in discriminating the dominance of the different failure modes with respect to the different stages of loading.
机译：声发射（AE）可用于在线监测复合结构。在各种应用程序中使用复合结构的主要问题之一是了解并表征其失效机制。在本文中，先进的信号处理技术用于区分大麻/环氧树脂和玻璃/环氧树脂复合层压板的失效机理。大麻/环氧树脂层压板由4层短切无纺纤维毡制成，玻璃/环氧树脂交叉层压板[0/90/90/0]（3s）由12层单向玻璃纤维毡制成。从层压板上切下尺寸为100x20x4mm的ASTM标准样品。这些样品在AE监控下承受弯曲载荷。使用AE数据的参数分析（例如不同负载水平下的计数率和累积计数）可以选择用于故障模式表征的AE信号。对所选的AE信号进行小波分解，以识别与不同故障模式相关的每个级别的能量和频率含量的百分比。研究表明，AE信号的小波分解在区分不同故障模式相对于加载的不同阶段的优势方面起着重要作用。

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