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Detection and quantification of delamination in laminated plates from the phase of appropriate guided wave modes

机译：从适当的导波模式的相位检测和量化层压板中的分层

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摘要

Applicability of specific Lamb wave modes for delamination detection and quantification in a laminated aluminum plate is investigated. The Lamb modes were generated in the plate using a broadband piezoelectric transducer structured with a rigid electrode. Appropriate excitation frequencies and modes for inspection were selected from theoretical dispersion curves. Sensitivity of antisymmetric and symmetric modes for delamination detection and quantification has been investigated using the Hilbert-Huang transform. The mode conversion phenomenon of Lamb waves during progressive delamination is observed. The antisymmetric mode is found to be more reliable for delamination detection and quantification. In this investigation, the changes in the phase of guided Lamb wave modes are related to the degree of delamination, unlike other studies, where mostly the attenuation of the propagating waves has been related to the extent of the internal damage, such as cracks and corrosions. Appropriate features for delamination detection and quantification are extracted from the experimental data.
机译：研究了特定的兰姆波模式在层压铝板中用于分层检测和量化的适用性。使用具有刚性电极的宽带压电换能器在板中产生兰姆模式。从理论色散曲线中选择了合适的激励频率和检查方式。使用Hilbert-Huang变换已经研究了用于分层检测和量化的反对称和对称模式的灵敏度。观察到Lamb波在逐层分层过程中的模式转换现象。发现反对称模式对于分层检测和定量更可靠。在这项研究中，引导的兰姆波模式的相位变化与分层程度有关，与其他研究不同，在其他研究中，传播波的衰减主要与内部损伤的程度有关，例如裂缝和腐蚀。从实验数据中提取了用于分层检测和定量的适当特征。

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