Numerical simulation and investigation of the spatial focusing of time reversal A0 Lamb wave mode using circular piezoelectric transducers collocated on a rectangular plate

The temporal-spatial focusing effect of the time-reversal method on the guided wave inspection in pipes was investigated theoretically in the current research with a transfer function. The amplitude of the time-reversed wave propagating along the pipes was not only determined by the characteristics of the defect and the location for observation but also by the location of the time-reversal transducers. Especially, the quantity of transducers distributed around the pipe in the circumferential direction was found to be important in applying such time-reversal method. The results demonstrate that the time-reversal method can be used to enhance the inspection energy for the guided wave inspection in pipes and to locate the defects in the circumferential directions. Once the time-reversed signals obtained from the guided wave inspection are applied on a numerical model, the defects can be recognized by the motion of the time-reversed wave transmitting along the pipe model. Numerical simulation and experimental results are provided in this paper to illustrate the validity of such defect-identifying method.

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Evaluation of the Impact of Abnormally Orientated Grains on the Performance of ScAlN-based Laterally Coupled Alternating Thickness (LCAT) Mode Resonators and Lamb Wave Mode Resonators

2020 IEEE International Ultrasonics Symposium (IUS) ◽

10.1109/ius46767.2020.9251507 ◽

2020 ◽

Author(s):

Chen Liu ◽

Bangtao Chen ◽

Minghua Li ◽

Yao Zhu ◽

Nan Wang

Keyword(s):

Lamb Wave ◽

Wave Mode ◽

The Impact

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Determining impact induced damage by lamb wave mode extracted by EMD method

Measurement ◽

10.1016/j.measurement.2014.11.033 ◽

2015 ◽

Vol 65 ◽

pp. 120-128 ◽

Cited By ~ 13

Author(s):

Xu Baochun ◽

Yuan Shenfang ◽

Wang Mulan ◽

Qiu Lei

Keyword(s):

Lamb Wave ◽

Wave Mode ◽

Emd Method

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Wave Propagation Analysis in Composite Laminates Containing a Delamination Using a Three-Dimensional Spectral Element Method

Mathematical Problems in Engineering ◽

10.1155/2012/659849 ◽

2012 ◽

Vol 2012 ◽

pp. 1-19 ◽

Cited By ~ 7

Author(s):

Fucai Li ◽

Haikuo Peng ◽

Xuewei Sun ◽

Jinfu Wang ◽

Guang Meng

Keyword(s):

Wave Propagation ◽

Lamb Wave ◽

Composite Laminates ◽

Composite Structures ◽

Spectral Element Method ◽

Three Dimensional ◽

Spectral Element ◽

Wave Mode ◽

Diagonal Form ◽

Element Method

A three-dimensional spectral element method (SEM) was developed for analysis of Lamb wave propagation in composite laminates containing a delamination. SEM is more efficient in simulating wave propagation in structures than conventional finite element method (FEM) because of its unique diagonal form of the mass matrix. Three types of composite laminates, namely, unidirectional-ply laminates, cross-ply laminates, and angle-ply laminates are modeled using three-dimensional spectral finite elements. Wave propagation characteristics in intact composite laminates are investigated, and the effectiveness of the method is validated by comparison of the simulation results with analytical solutions based on transfer matrix method. Different Lamb wave mode interactions with delamination are evaluated, and it is demonstrated that symmetric Lamb wave mode may be insensitive to delamination at certain interfaces of laminates while the antisymmetric mode is more suited for identification of delamination in composite structures.

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