Ultrasonic Guided Wave Inspection of Adhesive Joints: A Parametric Study for a Step-Lap Joint

Puthillath, Padmakumar; Kannajosyula, H.; Lissenden, Cliff J.; Rose, Joseph L.

doi:10.1063/1.3114081

Cited by 6 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Results from various fiber orientations (F), poling directions (P), and electric field directions (E) are shown in the table. Although the comb transducer is intended to excite a single mode, other modes may also be excited, so a two-dimensional discrete Fourier transform (2D FFT) was employed, as in Puthillath et al (2009), to assess which modes are actually present. In this method, a 2D FFT is applied to process the displacement data acquired from 64 points along a 5 wavelength-long line in the x-direction as a function of time.…”

Section: Finite Element Analysis Resultsmentioning

confidence: 99%

Piezoelectric Fiber Composite Strip Transducer Design Considerations for Generating Lamb Waves

Lissenden

2011

Journal of Intelligent Material Systems and Structures

Self Cite

View full text Add to dashboard Cite

Lamb waves have great promise among the various active monitoring schemes being researched for Structural Health Monitoring. Planar Lamb wave excitation using surface-bonded piezoelectric strips to function as comb transducers is investigated numerically for both the fundamental symmetric S0 and the antisymmetric A0 wave modes. This comb-type transducer is comprised of multiple piezoelectric elements, which are piezoelectric fiber composites sandwiched between electrodes. These transducer strips reduce the wiring requirements, can conform to curved surfaces, and the properties can be tailored to suit the application. Transducer variables are many; here fiber orientation, volume fraction, poling directions, and electrode locations are investigated. Specifically, piezocomposite properties are estimated through micromechanical modeling for input to finite element analysis of Lamb wave generation and propagation. For this multiphysics problem, the finite element analysis employs co-simulation using ABAQUS Standard and ABAQUS Explicit to simulate transient wave propagation from a strip transducer on a plate. In the finite element results, the amplitude of the Lamb wave at a prescribed distance from the transducer is evaluated to characterize the effectiveness of the composite comb transducer. Furthermore, results show that there are a number of cases where composite actuators provide a large amplitude response. After considering piezoelectric fiber direction, poling direction, and electric field direction, it appears that fiber, polarization, and activation electric fields through the thickness of the transducer represent the optimal design.

show abstract

Section: Finite Element Analysis Resultsmentioning

confidence: 99%

Piezoelectric Fiber Composite Strip Transducer Design Considerations for Generating Lamb Waves

Lissenden

2011

Journal of Intelligent Material Systems and Structures

Self Cite

View full text Add to dashboard Cite

show abstract

“…The main reasons are the simplicity and the straightforward digital implementation of the FFT. 26,28,38,84 In Heller et al 38 the FFT was adopted to process LW and to determine adhesive bond proprieties. The results showed the effectiveness of the method, including to detect irreparable damages caused by high temperatures.…”

Section: Fast Fourier Transformmentioning

confidence: 99%

“…When considering adhesive joints, there were a few studies that used the fast Fourier transform (FFT) signal processing method to analyze the interference of the LW with the adhesive structure. The main reasons are the simplicity and the straightforward digital implementation of the FFT 26,28,38,84 . In Heller et al 38 the FFT was adopted to process LW and to determine adhesive bond proprieties.…”

Section: Signal Processing Techniquesmentioning

confidence: 99%

Structural health monitoring of adhesive joints using Lamb waves: A review

Ramalho

Lopes

Silva

2021

Structural Contr & Hlth

View full text Add to dashboard Cite

In the past decades, Lamb waves (LW) have seen encouraging results when applied to non destructive testing (NDT) and structural health monitoring (SHM), with important research done continuously through the years in both fields. This paper is a comprehensive review on equipment, testing procedures and techniques adopted in NDT and SHM, with emphasis in applications involving SHM of adhesive joints. The fundamentals of LW and their application to damage detection are discussed, and different signal processing, statistical, machine learning and simulation methods are presented. The paper represents a basis to deepen the understanding about the problem at hand and is a thorough compilation of relevant information to future work. Although LW-based SHM methods have been heavily studied, there is a gap of few to no studies between these topics and adhesive joints, namely, for monitoring weak adhesion.

show abstract

“…Mode conversion at the geometry transition was studied theoretically and an overall transmission coefficient for A0 incidence was studied experimentally. Puthillath et al 17 conducted a parametric study on the inspection of a step-lap joint. The effect of adhesive bond geometry, material properties, and the presence of a defect on the transmission coefficients of guided wave modes was studied.…”

Section: Introductionmentioning

confidence: 99%

Modal content-based damage indicators for disbonds in adhesively bonded composite structures

Ren

Lissenden

2016

Structural Health Monitoring

View full text Add to dashboard Cite

Adhesive bonding is a promising joining method for composite materials. This article focuses on the use of modal content-based damage indicators to improve the sensitivity of guided waves to disbonds in the adhesive. Wave-defect interaction is modeled using frequency-domain finite element analysis in order to identify modes sensitive to adhesive degradation in joints between carbon fiber-reinforced polymer laminates. Phased array transducers and multielement array sensors designed for structural health monitoring are employed to enable preferential mode excitation and modal content extraction, respectively. The domains in dispersion curve space predicted to have good, intermediate, and no sensitivity to disbond were experimentally found to have good, intermediate, and limited sensitivity using a feature of the received signals associated with the modal amplitude or a modal amplitude ratio. Furthermore, the modal amplitude was found to decrease monotonically with increasing disbond size, demonstrating that it has potential to quantitatively size disbonds.

show abstract

Ultrasonic Guided Wave Inspection of Adhesive Joints: A Parametric Study for a Step-Lap Joint

Cited by 6 publications

References 0 publications

Piezoelectric Fiber Composite Strip Transducer Design Considerations for Generating Lamb Waves

Piezoelectric Fiber Composite Strip Transducer Design Considerations for Generating Lamb Waves

Structural health monitoring of adhesive joints using Lamb waves: A review

Modal content-based damage indicators for disbonds in adhesively bonded composite structures

Contact Info

Product

Resources

About