Impact Damage Detection in Composite Structures Considering Nonlinear Lamb Wave Propagation
Impact Damage Detection in Composite Structures Considering Nonlinear Lamb Wave Propagation
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DOI：
10.1080/15376494.2014.907950
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发表时间：
2015-01-01
影响因子：
2.8
通讯作者：
Lammering, Rolf
中科院分区：
文献类型：
--
作者：
Rauter, Natalie;Lammering, Rolf
为了准确地检测复合材料中的纤维/基体裂纹和分层等微观结构损伤，开发了新的方法。以往的研究表明，声非线性参量是一种很好的工具，可以用来检测金属的塑性损伤、金属和复合材料的疲劳损伤等微结构损伤。在这项工作中，二次谐波产生用于分析复合材料试样的冲击损伤。因此，兰姆波发射和检测的压电致动器和传感器，分别在一定的频率，以产生累积的二次谐波模式。激励频率必须满足特殊条件。通过使用小波变换来完成信号处理，以避免使用短时傅立叶变换可能发生的误解。Morlet小波被用作母小波。的相对声学非线性参数的结果进行了比较，由于冲击损伤的群速度的发展。结果表明，相对声学非线性参数比群速度的发展对冲击损伤更为敏感。
To detect micro-structural damages like fiber/matrix cracks and delaminations in composite materials accurately new methods are developed. Previous works have investigated and shown that the acoustical nonlinearity parameter is a good tool to detect microstructural damages like plasticity inmetal and fatigue damages inmetal and composites. In this work, the second harmonic generation is used to analyze composite specimens for impact damages. Therefore, Lamb waves are launched and detected by a piezoelectric actuator and sensor, respectively, at a certain frequency to generate cumulative second harmonic modes. The excitation frequency has to meet special conditions. The signal processing is done by using the wavelet transform to avoid misinterpretations that may occur using the short-time Fourier transform. The Morlet wavelet is used as the mother wavelet. The results of the relative acoustical nonlinearity parameter are compared to the development of the group velocity due to impact damages. It is shown that the relative acoustical nonlinearity parameter is more sensitive to impact damages than the development of the group velocity.