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Multi-instrument in-situ damage monitoring in quasi-isotropic CFRP laminates under tension

机译：拉伸下准各向同性CFRP层压板的多仪器原位损伤监测

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摘要

Digital Image Correlation monitoring of the surface strains, microscopic in-situ observations of the micro-damage on the specimen edge and Acoustic Emission (AE) are utilized simultaneously during tension tests of quasi-isotropic carbon fibre reinforced polymer composites. It is found that the cluster analysis for characteristic parameters of AE events (the main being the signal amplitude and frequency) does not unambiguously identify the type of damage which causes the event. With optical instruments, it is observed that the signatures of AE events depend on the position of the ply where damage happens and on the ply orientation (90 degrees vs 45 degrees). Robust evidences for the variations in AE characteristics of damage modes in different lay-ups are presented. AE events, originated from surface cracks, have high amplitude and low frequency, whereas AE events, originated from transverse cracks in the inner plies, have low amplitude and high frequency characteristics. Any conclusion for fibre breaks are not reached in this study. Therefore, measurements in this study rather point out that the AE events, which could be interpreted as fibre breaks because of their high frequency characteristics, as optical observations prove, correspond to other damage types in quasi-isotropic laminates.
机译：在准各向同性碳纤维增强聚合物复合材料的拉伸试验中，同时利用了表面应变的数字图像相关监测，样品边缘微损伤的微观原位观察和声发射（AE）。结果发现，对声发射事件特征参数（主要是信号幅度和频率）的聚类分析不能明确地识别出导致事件的损害类型。使用光学仪器，可以观察到AE事件的信号取决于发生损坏的层的位置以及层的方向（90度vs 45度）。给出了不同叠层中损伤模式的AE特性变化的有力证据。源于表面裂纹的AE事件具有高振幅和低频，而源于内层横向裂纹的AE事件具有低振幅和高频特性。这项研究没有得出任何关于纤维断裂的结论。因此，本研究中的测量结果更确切地说，AE事件（如光学观察所证明的那样，由于其高频特性可以解释为纤维断裂）与准各向同性层压板中的其他损伤类型相对应。

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