scholarly journals Phased Array Beamsteering in Composite Laminates for Guided Wave Structural Health Monitoring

2013 ◽  
Author(s):  
Peter Osterc ◽  
Daewon Kim ◽  
Byungseok Yoo
Keyword(s):  
Wave Propagation ◽  
Composite Laminates ◽  
Phased Array ◽  
Linear Array ◽  
Wave Mode ◽  
Guided Wave ◽  
Isotropic Case ◽  
Inherent Anisotropy ◽  
Guided Wave Propagation ◽  
And Performance

In this study, a guided wave phased array beamsteering approach is applied to composite laminates. Current beamsteering algorithms derived for isotropic materials assume omnidirectional wave propagation. Due to inherent anisotropy in composites, guided wave propagation varies with direction and wavefronts no longer have perfect circular shapes. By examining slowness, velocity and wave curves for a given composite laminate, the wavefront from a single source can be described as a function of the angle of propagation and distance from origin. Using this approach, a generic delay and sum beamforming algorithm for composite laminates is developed for any desired wave mode. It is shown that anisotropic wave mode regions can be effectively used for beamsteering in certain directions with a linear array and performance similar or even better than isotropic case. However, the useful range of angles with a 1d linear array for anisotropic wave modes is quite small and other directions exhibit undesired grating lobes and large sidelobes.

Guided wave propagation in composite laminates using piezoelectric wafer active sensors

2013 ◽  
Vol 117 (1196) ◽  
pp. 971-995 ◽  
Author(s):  
M. Gresil ◽  
V. Giurgiutiu
Keyword(s):  
Wave Propagation ◽  
Composite Laminates ◽  
Composite Laminate ◽  
Mechanical Impedance ◽  
Guided Wave ◽  
Impedance Method ◽  
Active Sensors ◽  
Piezoelectric Wafer Active Sensors ◽  
Guided Wave Propagation ◽  
Piezoelectric Wafer

AbstractPiezoelectric wafer active sensors (PWAS) are lightweight and inexpensive transducers that enable a large class of structural health monitoring (SHM) applications such as: (a) embedded guided wave ultrasonics, i.e., pitch-catch, pulse-echo, phased arrays; (b) high-frequency modal sensing, i.e., electro-mechanical impedance method; and (c) passive detection. The focus of this paper is on the challenges posed by using PWAS transducers in the composite laminate structures as different from the metallic structures on which this methodology was initially developed. After a brief introduction, the paper reviews the PWAS-based SHM principles. It follows with a discussion of guided wave propagation in composites and PWAS tuning effects. Then, the mechanical effect is discussed on the integration of piezoelectric wafer inside the laminate using a compression after impact. Experiments were performed on a glass fibre laminate, employing PWAS to measure the attenuation coefficient. Finally, the paper presents some experimental and multi-physics finite element method (MP-FEM) results on guided wave propagation in composite laminate specimens.

Guided wave propagation in high-speed train axle and damage detection based on wave mode conversion

2015 ◽  
Vol 22 (9) ◽  
pp. 1133-1147 ◽  
Author(s):  
Fucai Li ◽  
Xuewei Sun ◽  
Jianxi Qiu ◽  
Limin Zhou ◽  
Hongguang Li ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Damage Detection ◽  
High Speed ◽  
Mode Conversion ◽  
Wave Mode ◽  
Guided Wave ◽  
High Speed Train ◽  
Guided Wave Propagation

Manipulation of the guided wave propagation in multilayered phononic plates by introducing interface delaminations

2021 ◽  
pp. 104266
Author(s):  
Yanzheng Wang ◽  
Elias Perras ◽  
Mikhail V. Golub ◽  
Sergey I. Fomenko ◽  
Chuanzeng Zhang ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Guided Wave ◽  
Guided Wave Propagation

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

2012 ◽  
Vol 2012 ◽  
pp. 1-19 ◽  
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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