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Damage detection in composites by vibrothermography and local resonances

机译：通过振动热成像和局部共振检测复合材料中的损伤

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摘要

Vibrothermography is an active thermographic technique able to detect singularities like de-lamination in composite materials. Carbon fibre laminates are increasingly used, especially in aviation industry where defect detection is directly related to safety. Physical causes of the internal heating mechanism linked to defect interaction with the elastic waves may be friction, viscoelastic hysteresis or plasticity. The method can efficiently detect flaws on complex geometries and only requires that both internal faces or edges are free to vibrate. The purpose of this work is to determine the relation between the observed heating right above a delamination by an IR camera and the frequency of a sinusoidal excitation between 8 and 27 kHz. The results clearly show specific heating peaks at certain frequencies. The comparison with local resonance frequencies of the delamination computed by simplified FEM shows similarities with the appearance of heating peaks. An experimental study having as goal to exploit the presence of those peaks and thus to increase the sensitivity of the method shows the interest for a high sweep sinusoidal excitation of the chirp type. The final objective of this research is to set up a serviceable short and reliable vibrothermographic test for non-destructive testing of composite materials.
机译：振动热成像技术是一种主动的热成像技术，能够检测复合材料中的奇点，例如分层。碳纤维层压板越来越多地被使用，特别是在缺陷检测与安全性直接相关的航空工业中。内部加热机制中与缺陷与弹性波相互作用有关的物理原因可能是摩擦，粘弹性滞后或可塑性。该方法可以有效地检测复杂几何形状上的缺陷，只需要两个内表面或边缘自由振动即可。这项工作的目的是确定红外摄像机在分层上方上方观察到的加热与8至27 kHz之间的正弦激励频率之间的关系。结果清楚地显示了在某些频率下的特定加热峰。用简化的有限元法计算的分层的局部共振频率的比较显示出与加热峰的外观相似。以利用那些峰的存在并因此增加方法的灵敏度为目标的实验研究表明，对for型高扫描正弦激励感兴趣。这项研究的最终目的是为复合材料的无损检测建立一种可服务的短而可靠的振动热成像测试。

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