Lamb wave mode conversion and multiple-reflection mechanisms for simply and reliably evaluating delamination in composite laminates

Lamb wave mode conversion and multiple-reflection mechanisms for simply and reliably evaluating delamination in composite laminates
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兰姆波模式转换和多重反射机制可简单可靠地评估复合材料层压板的分层

DOI:
10.1080/09243046.2022.2146564
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发表时间:
2022
影响因子:
2.9
通讯作者:
Nobuyuki Toyama
Nobuyuki Toyama
中科院分区:
材料科学3区
文献类型:
--
作者:
Kazuki Ryuzono;Shigeki Yashiro;Sota Onodera;Nobuyuki Toyama

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为了简单地评估超声检测过程中的分层,必须全面了解兰姆波传播。然而,使用激光多普勒振动计和脉冲激光扫描仪可视化的波传播之间的差异尚未得到充分研究,并且对评估分层的最佳条件的了解也很有限。因此,在这项研究中,使用不同的激光扫描仪、分层深度和波入射角来可视化在分层交叉层压板中传播的兰姆波的模式转换和多次反射。在特定条件下使用最大振幅图后处理来表征分层。进一步的数值分析表明,由于入射波和模式转换波中反对称模式的多次反射,分层层压板中产生了驻波。色散曲线和弯曲刚度计算证实了高振幅驻波所需的条件,从而为在检查过程中简单可靠地评估分层提供了指导。
Lamb wave propagation must be understood comprehensively for simply evaluating delamination during ultrasonic testing. However, the difference between wave propagation, visualized using laser Doppler vibrometer and pulsed-laser scanners, has not been sufficiently investigated, and knowledge of optimal conditions for evaluating delamination is limited. Thus, in this study, the mode conversion and multiple reflections of Lamb waves propagating in a delaminated cross-ply laminate were visualized using different laser scanners, delamination depths, and wave incident angles. Delamination was characterized using maximum-amplitude map postprocessing under specific conditions. Further numerical analysis revealed that owing to multiple reflections of the antisymmetric mode in incident and mode-converted waves, standing waves were generated in the delaminated sublaminate. Dispersion curve and flexural stiffness calculations confirmed the conditions required for high-amplitude standing waves, thereby providing guidelines for simply and reliably evaluating delamination during inspections.
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