Measurement of the elastic moduli of carbon fiber-reinforced plastics (CFRP) can be difficult owing to the anisotropic and viscoelastic characteristics of CFRP. In this study, a technique based on resonant ultrasound spectroscopy is proposed that can identify the viscoelastic moduli of CFRP by measuring the resonant frequencies. The resonant frequencies of a CFRP specimen were measured by employing an experimental device comprising a pair of piezoelectric transducers and the spectrum analyzer software. The viscoelastic moduli were thereby identified by applying genetic algorithms. Considering the viscoelastic properties, it is possible to conduct highly accurate analysis as compared to the case in which the viscoelastic properties are not considered. Furthermore, by measuring the resonance modes that are significantly affected by the three independent viscoelastic moduli ( , , ), each modulus can be identified with constant precision.

中文翻译：

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通过测量共振频率确定 CFRP 的各向异性粘弹性模量

由于 CFRP 的各向异性和粘弹性特性，测量碳纤维增强塑料 (CFRP) 的弹性模量可能很困难。在这项研究中，提出了一种基于共振超声光谱的技术，该技术可以通过测量共振频率来识别 CFRP 的粘弹性模量。通过使用包括一对压电换能器和频谱分析仪软件的实验装置来测量 CFRP 样品的共振频率。从而通过应用遗传算法识别粘弹性模量。考虑到粘弹性，与不考虑粘弹性的情况相比，可以进行高精度的分析。此外，