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首页> 外文期刊>NDT & E international >Towards in-plane local defect resonance for non-destructive testing of polymers and composites
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Towards in-plane local defect resonance for non-destructive testing of polymers and composites

机译：朝着平面内局部缺陷共振进行聚合物和复合材料的无损检测

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摘要

Local defect resonance (LDR) makes use of high frequency vibrations to get a localized resonant activation of the defect. In this study, it is shown for various samples and damage features that the classical out-of-plane local defect resonance can be equally extended towards in-plane local defect resonance. It is found that the in-plane LDR typically occurs at higher frequencies, which is linked to the specific geometry of common defects. This increased frequency allows for a reduction in measurement time. More importantly, the results indicate that the in-plane LDR has an increased sensitivity for defects with dominant out-of-plane defect interfaces (e.g. surface breaking crack). Knowledge of both the out-of-plane and in-plane LDR provides further insight on the internal structure of a defective area. This is explicitly demonstrated on a carbon composite which was subjected to low velocity impact, inducing barely visible impact damage.
机译：局部缺陷共振（LDR）利用高频振动来获得缺陷的局部共振激活。在这项研究中，对于各种样品和损伤特征，可以证明经典的平面外局部缺陷共振可以同样地扩展到平面内局部缺陷共振。发现平面内LDR通常在较高的频率下发生，这与常见缺陷的特定几何形状有关。这种增加的频率可以减少测量时间。更重要的是，结果表明面内LDR对具有主要面外缺陷界面（例如表面破裂裂纹）的缺陷具有更高的敏感性。平面外和平面内LDR的知识可进一步了解缺陷区域的内部结构。这在经受低速冲击的碳复合材料上得到了明显证明，几乎没有可见的冲击损伤。

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