Ultrasonic bandgaps and interlaminar interface echoes of composite laminates: Analysis and experiments
Ultrasonic bandgaps and interlaminar interface echoes of composite laminates: Analysis and experiments
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DOI：
10.1121/1.5014518
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发表时间：
2017-11
影响因子：
2.4
通讯作者：
S. Biwa;Y. Ishii
中科院分区：
文献类型：
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作者：
S. Biwa;Y. Ishii
碳纤维增强塑料 (CFRP) 在航空航天工业中的应用不断增加，凸显了无损方法表征其机械性能和缺陷浓度的重要性。在 CFRP 层压结构中，层之间存在薄树脂层，通常厚度为几微米。它们的空间周期性性质导致波长与层厚度相当的超声波的带隙。包括此类带隙在内的超声波反射和透射光谱的特征可用于 CFRP 层压板的无损表征。特别是，带隙附近超声波的反射或透射谱的振荡频率依赖性可用于识别层间界面的等效刚度。这些界面刚度包含层间界面机械健全性的丰富信息，否则很难用传统的超声方法进行评估......
Increasing applications of carbon fiber reinforced plastics (CFRP) in aerospace industry highlight the importance of nondestructive methods to characterize their mechanical properties as well as defect concentrations. In CFRP laminate structures, thin resin layers, typically of a few micron thickness, are present between plies. Their spatially periodic nature causes bandgaps for ultrasonic waves having wavelengths comparable to the ply thickness. Features of the reflection and transmission spectra of ultrasonic waves including such bandgaps can be utilized for nondestructive characterization of CFRP laminates. In particular, the oscillatory frequency dependence of the reflection or transmission spectra of ultrasonic waves near the band gaps can be used to identify the equivalent stiffnesses of interlaminar interfaces. These interfacial stiffnesses contain rich information of the mechanical soundness of the interlaminar interfaces which are otherwise difficult to evaluate with traditional ultrasonic method...