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首页> 外文期刊>Measurement Science & Technology >Experimental study of electromagnetic emission signals generated by crack generation in composite materials
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Experimental study of electromagnetic emission signals generated by crack generation in composite materials

机译：复合材料中裂纹产生的电磁辐射信号的实验研究

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摘要

The formation of a crack is accompanied by the generation of an electromagnetic field. A differential equation was derived and solved to describe the transformation of the field parameters into an electric signal, provided capacitive sensors are used. In the next stage, an analysis of spurious external electromagnetic and acoustic fields was carried out, and measures to suppress their effects were designed. The issue of amplifying extremely low electromagnetic signals generated during the crack formation was dealt with, too. The mentioned analyses resulted in the design of a method to detect and evaluate electromagnetic emission (EME) signals and acoustic emission (AE) signals, which accompany mechanical stressing of materials and structures. Based on the results of such analyses, an automated double-channel measuring apparatus was used for signal data acquisition, saving and processing. The operation of the apparatus was successfully tested by processing a large set of measurement results obtained from a composite material called 'extren'. Our experimental results confirmed the correctness of both the EME and AE measurement methods, and measuring apparatus design. Our measurement results make it possible to track the behaviour of cracks, localize them and evaluate some of their basic parameters.
机译：裂纹的形成伴随着电磁场的产生。推导并求解了一个微分方程，描述了使用电容传感器的场参数到电信号的转换。在下一阶段，对杂散外部电磁场和声场进行了分析，并设计了抑制其影响的措施。还解决了放大在裂纹形成期间产生的极低电磁信号的问题。上面提到的分析导致设计出一种检测和评估电磁辐射（EME）信号和声发射（AE）信号的方法，这些方法伴随着材料和结构的机械应力。基于这些分析的结果，使用自动双通道测量设备进行信号数据的采集，保存和处理。通过处理从称为“ extren”的复合材料获得的大量测量结果，成功测试了该设备的操作。我们的实验结果证实了EME和AE测量方法以及测量设备设计的正确性。我们的测量结果使跟踪裂纹的行为，定位裂纹和评估其一些基本参数成为可能。

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