Rayleigh to Lamb wave conversion at a delamination-like crack

Schaal, Christoph; Samajder, Himadri; Baid, Harsh; Mal, Ajit

doi:10.1016/j.jsv.2015.05.016

Cited by 48 publications

(25 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The leading edge of the defect is 50 mm away from the force input, and the disbond is 50 mm long. It has been shown in the previous research that the stress singularity at the tips of the disbond has negligible effect on the waves in the far field [19]. The response is determined at virtual receivers 1, 2, and 3.…”

Section: Semi-analytical Numerical and Experimental Methodsmentioning

confidence: 99%

“…Following the ideas of preliminary research by the authors on this problem [17][18][19], the basic features of guided wave interaction with defects are studied, in particular the mode conversion at the leading and trailing edge of the damage located at a depth that is much smaller than the plate thickness. In this case, the segment above the crack acts as a newly formed waveguide for Lamb waves.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the segment above the crack acts as a newly formed waveguide for Lamb waves. In this region, "wave trapping" occurs under certain conditions, i.e., only low transmission to other waves occurs at the trailing edge of the crack [6,19]. Depending on the excitation frequency and thickness of the core of the sandwich panel, it is shown that the segment below the defect also acts as a waveguide for either Lamb or Rayleighlike waves.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Core-Skin Disbond Detection in a Composite Sandwich Panel Using Guided Ultrasonic Waves

Schaal

Mal

2017

Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems

Self Cite

View full text Add to dashboard Cite

Advanced composite materials are being increasingly used in state-of-the-art aircraft and aerospace structures due to their many desirable properties. However, such composite materials are highly susceptible to developing internal damage. Thus, safe operation of such structures requires a comprehensive program of effective nondestructive inspection and maintenance of their critical load bearing components before the defects grow and become unstable, resulting in failure of the entire structure. Ultrasonic guided wavebased methods have the potential to significantly improve current inspection techniques for large plate-like structural components due to the waves' large propagation range and sensitivity to defects in their propagation path. The application of guided waves for nondestructive evaluation (NDE) of real structures, however, requires a thorough understanding of the characteristics of guided waves in composite structures in the presence and absence of any defects. In this paper, the interaction of guided waves with a core-skin disbond in a composite sandwich panel is studied using a semi-analytical method, numerical simulations, and laboratory experiments. It is shown that the disbond causes complex mode conversion at its leading and trailing edges. The theoretical findings are verified with laboratory experiments, and the applicability of the proposed pitch-catch setup for NDE of complex composite structures for damage detection is discussed.

show abstract

Section: Semi-analytical Numerical and Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Core-Skin Disbond Detection in a Composite Sandwich Panel Using Guided Ultrasonic Waves

Schaal

Mal

2017

Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, taking a PSD (power spectral density)-based damage index into account, the frequency content of the acquired voltage is approaching that of the excitation signal, as delamination is placed in higher depth in the laminate. [45] Regarding the wave conversion indicator, a thick aluminum plate considered as a half-space containing delamination-like damage has been inspected by surface Rayleigh waves converted to Ao Lamb waves when encountering delamination area [44]. Half-space or waveguide domain is decided by wavelength and plate's dimensions.…”

Section: Elastic Wave-based Inspectionmentioning

confidence: 99%

A Survey of Scrutinizing Delaminated Composites via Various Categories of Sensing Apparatus

Askaripour

Żak

2019

J. Compos. Sci.

View full text Add to dashboard Cite

Scrutinizing delaminated composites is extensively conducted based on measurements of various types of nondestructive sensing apparatus, classified herein as systems of thermographic inspection, piezoelectric inspection, optical interferometric inspection, electromagnetic testing, ultrasonic testing, and visual testing. The development of the subject has been reviewed during 2000–2017. Not only does the substantial corresponding literature strongly indicates numerous increasing industrial demand for composites, including carbon fiber-reinforced polymer, glass fiber-reinforced polymer, and fiber-reinforced metal laminate, but also the significant potential of composites to delaminate when subjected particularly to impact, machining operation or manufacturing imperfections. Conducting a study on the corresponding literature, the subject of delamination inspection within composites is found to be a dynamic, mature field, while lacking a thorough literature review. Therefore, the present study addresses the mentioned gap regarding various sensation systems utilized so as to detect internal anomalies in composites for the review arrangement. To that end, the literature inclusion in terms of citation times is electronically adopted associated with an appropriate combination of keywords. The study may be considered as a comprehensive, up-to-date review covering all delamination inspection techniques founded on sensation systems, thus benefiting the readers with information in an organized configuration.

show abstract

“…Authors of paper [4] utilized mode conversion phenomenon for estimation of rectangular notch parameters in the metallic plate. In the research work [5] phenomenon of Rayleigh wave to Lamb wave mode conversion was investigated. Authors presented numerical and experimental results for the metal plate.…”

Section: Introductionmentioning

confidence: 99%

Analysis of S0/A0 elastic wave mode conversion phenomenon in glass fibre reinforced polymers

2018

View full text Add to dashboard Cite

In this paper results of experimental analysis of elastic guided wave mode conversion phenomenon in glass fibre reinforced polymers GFRP are presented. Results of research presented in this paper are strictly focused on S0/A0' mode conversion caused by discontinuities in the form of circular teflon insert simulating damage and impact damage. Experimental research is based on non-contact elastic wave sensing with utilisation of scanning laser Doppler vibrometer SLDV and full wave-field measurements. In presented research influence of location of circular teflon insert on S0/A0' mode conversion is investigated. Teflon inserts were located between layers of composite material at different depth. Moreover influence of impact damage with different energy on S0/A0' mode conversion is investigated. Analysis of influence of investigated discontinuities on S0/A0' mode conversion are based on the elastic wave mode filtration in frequency-wavenumber domain. Mode filtration process allows to remove effects of unwanted type of mode propagation in forward or backward direction. Effects of S0/A0' mode conversion are characterise by mode conversion indicator based on amplitude of new mode A0'.

show abstract

Rayleigh to Lamb wave conversion at a delamination-like crack

Cited by 48 publications

References 15 publications

Core-Skin Disbond Detection in a Composite Sandwich Panel Using Guided Ultrasonic Waves

Core-Skin Disbond Detection in a Composite Sandwich Panel Using Guided Ultrasonic Waves

A Survey of Scrutinizing Delaminated Composites via Various Categories of Sensing Apparatus

Analysis of S0/A0 elastic wave mode conversion phenomenon in glass fibre reinforced polymers

Contact Info

Product

Resources

About