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Vibration of CFRP cantilever beam with damage

机译：CFRP悬臂梁的振动有损坏

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摘要

The aim of this paper is the analysis of vibration of undamaged and damaged Carbon Fibre Reinforced Polymer (CFRP) beam elements. Experimental free vibration of CFRP cantilever beam elements were investigated by dynamic tests; damage of CFRP specimens were locally due to double notches close to the fixed end with different reduction of section and bending stiffness. Frequency values were extracted by transformed signals in frequency domain using the Fast Fourier Transform (FFT) technique. A comparison was made of the experimentally extracted frequencies at each damage level and in relation to the single positions of the accelerometer. The present paper illustrates the envelope of Frequency Response Functions (FRFs) obtained by the experimental dynamic tests and the changes of natural frequency values correlated to the damage degree of CFRP beam element. Theoretically, the dynamic behavior of damaged CFRP cantilever beam is studied with an appraisal model adopting an elastic hinge as equivalent concentrated damage. Theoretical data is defined and discussed in comparison to the experimental results.
机译：本文的目的是分析未损坏和损坏的碳纤维增强聚合物（CFRP）梁单元的振动。通过动态试验研究了CFRP悬臂梁单元的实验自由振动。 CFRP试样的损坏是由于靠近固定端的双缺口造成的，而缺口和弯曲刚度的减小程度不同。使用快速傅立叶变换（FFT）技术通过频域中的变换信号提取频率值。比较了在每种损伤水平下相对于加速度计的单个位置的实验提取频率。本文说明了通过实验动态测试获得的频率响应函数（FRF）的包络以及与CFRP梁单元损伤程度相关的自然频率值的变化。理论上，采用弹性铰链作为等效集中损伤的评估模型，对损伤的CFRP悬臂梁的动力特性进行了研究。定义理论数据并与实验结果进行比较。

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