Experimental investigation of impact of environmental temperature and optimal baseline for thermal attenuation in structural health monitoring based on ultrasonic guided waves

Wave Motion ◽  
2020 ◽  
Vol 93 ◽  
pp. 102474 ◽  
Author(s):  
Saqlain Abbas ◽  
Fucai Li ◽  
Yanping Zhu ◽  
Xiaotong Tu
Keyword(s):  
Experimental Investigation ◽  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Guided Waves ◽  
Environmental Temperature ◽  
Ultrasonic Guided Waves ◽  
Structural Health

Integrated Structural Health Monitoring With Guided Waves From Piezoelectric Fibers

2008 ◽  
Author(s):  
Cliff J. Lissenden ◽  
James J. Blackshire ◽  
Padma K. Puthillath
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Guided Waves ◽  
Hot Spot ◽  
Laminated Plates ◽  
Ultrasonic Guided Waves ◽  
Distributed Monitoring ◽  
Element Analysis ◽  
Structural Health ◽  
Displacement Profile

Active structural health monitoring of plate-like structures can be performed with ultrasonic guided waves. The activation of ultrasonic guided waves from embedded piezoelectric fibers in carbon fiber reinforced polymer (CFRP) laminated plates is investigated. Finite element analysis simulations of wave propagation from an array of embedded parallel piezoelectric fibers are presented. A quasi-isotropic CFRP having piezoelectric fibers embedded at the midplane is studied. The number and spacing of piezoelectric fibers is varied in order to activate different modes at different frequencies. The simulation results (i) characterize the displacement profile through the thickness of the CFRP plate, (ii) enable visualization of mode excitability, and (iii) demonstrate the source influence. The results indicate that the embedded fibers have a strong potential for either hot spot monitoring or distributed monitoring of large areas. However, due to the size, spacing, and activation of embedded fibers the source influence causes the mode excitability to differ from that of a conventional comb transducer.

Selective generation of ultrasonic guided waves for damage detection in rectangular bars

2020 ◽  
pp. 147592172094740
Author(s):  
Valentin Serey ◽  
Nicolas Quaegebeur ◽  
Mathieu Renier ◽  
Philippe Micheau ◽  
Patrice Masson ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Guided Waves ◽  
Infinite Plate ◽  
Laser Doppler Vibrometer ◽  
Single Mode ◽  
Ultrasonic Guided Waves ◽  
Structural Health ◽  
Selective Generation ◽  
Mode Generation

Ultrasonic guided waves are used in non-destructive testing and structural health monitoring solutions for long-range inspection, in applications ranging from Civil Engineering to Aerospace. In order to ease the inspection process, it is generally preferable to generate a carefully selected single mode. Although single mode Lamb wave generation is not difficult to achieve in infinite plate-like structures, with carefully polarized or sized piezoceramic elements, for example, such selective generation is much more difficult in a rectangular bar. In this article, we consider the propagation along a thin plate of finite rectangular cross section, which corresponds to a rectangular bar. The finite lateral width leads to a greater density of modes compared to an infinite plate. The authors have previously addressed this matter and developed a methodology for the selective generation of modes in the harmonic regime. This article extends this methodology to selective mode generation for finite time excitation, such as bursts. Results are presented for single mode generation of A0,0 and A0,1 in an aluminum bar instrumented with eight piezoelectric transducers. The waveguide modal basis is calculated with the two-dimensional semi-analytical finite element method, and measurements are conducted using a three-dimensional laser-Doppler vibrometer. To illustrate the potential of the method for structural health monitoring purposes, the detection of a defect simulated by a pair of magnets placed at various positions over the bar width is demonstrated.

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