Experimental and computational investigations on the scattering of fundamental symmetric lamb wave by edge crack at a circular hole in an isotropic plate.

B. S. Vien*, L. R.F. Rose, W. K. Chiu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

Fuel vent holes in aircraft components are vulnerable to fatigue cracking and remain a significant challenge for structural integrity management. There is significant interest in using Lamb wave propagation for structural health monitoring (SHM) in such cases due to their low attenuation and rapid wide-area coverage. Unlike bulk waves, solving Lamb wave applications are more complicated and, thus, require further research, both experimentally and computationally, in order to fully exploit their potential for SHM. This paper presents experimental and computational studies of the interaction between the fundamental symmetrical mode S0 and a small through-thickness edge crack at a circular hole in an isotropic plate. The incident S0 wave is generated by a pinching force whose time dependence is a 5.5-cycle Hann-windowed toneburst of centre frequency below the cut-off for the first order Lamb wave modes (SH1). 2D Fast Fourier Transformation (2D FFT) is performed to produce the dispersion curves to identify the scattered Lamb wave mode. The scattering pattern and dependence of scattering amplitude on small crack size are reported and shown to be equivalent to a point source consisting of a particular combination of force doublets, and that the amplitude of the scattered field increases quadratically with crack length a. This study is regarded as a forward problem for a subsequent attempt to investigate the inverse problem of quantifying crack size from scattered wave measurements. Contribution of the findings to non-destructive crack detection and characterisation in SHM are also briefly discussed.

Original languageEnglish
Title of host publication9th Australasian Congress on Applied Mechanics, ACAM 2017
PublisherNational Committee on Applied Mechanics
Volume2017-November
ISBN (Electronic)9781925627022
Publication statusPublished - 2017
EventAustralasian Congress on Applied Mechanics 2017 - University of New South Wales, Sydney, Australia
Duration: 27 Nov 201729 Nov 2017
Conference number: 9th
https://acam9.com.au/

Conference

ConferenceAustralasian Congress on Applied Mechanics 2017
Abbreviated titleACAM 2017
CountryAustralia
CitySydney
Period27/11/1729/11/17
Internet address

Keywords

  • Edge crack
  • Fuel vent hole
  • Lamb waves
  • Structural health monitoring

Cite this

Vien, B. S., Rose, L. R. F., & Chiu, W. K. (2017). Experimental and computational investigations on the scattering of fundamental symmetric lamb wave by edge crack at a circular hole in an isotropic plate. In 9th Australasian Congress on Applied Mechanics, ACAM 2017 (Vol. 2017-November). National Committee on Applied Mechanics.
Vien, B. S. ; Rose, L. R.F. ; Chiu, W. K. / Experimental and computational investigations on the scattering of fundamental symmetric lamb wave by edge crack at a circular hole in an isotropic plate. 9th Australasian Congress on Applied Mechanics, ACAM 2017. Vol. 2017-November National Committee on Applied Mechanics, 2017.
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abstract = "Fuel vent holes in aircraft components are vulnerable to fatigue cracking and remain a significant challenge for structural integrity management. There is significant interest in using Lamb wave propagation for structural health monitoring (SHM) in such cases due to their low attenuation and rapid wide-area coverage. Unlike bulk waves, solving Lamb wave applications are more complicated and, thus, require further research, both experimentally and computationally, in order to fully exploit their potential for SHM. This paper presents experimental and computational studies of the interaction between the fundamental symmetrical mode S0 and a small through-thickness edge crack at a circular hole in an isotropic plate. The incident S0 wave is generated by a pinching force whose time dependence is a 5.5-cycle Hann-windowed toneburst of centre frequency below the cut-off for the first order Lamb wave modes (SH1). 2D Fast Fourier Transformation (2D FFT) is performed to produce the dispersion curves to identify the scattered Lamb wave mode. The scattering pattern and dependence of scattering amplitude on small crack size are reported and shown to be equivalent to a point source consisting of a particular combination of force doublets, and that the amplitude of the scattered field increases quadratically with crack length a. This study is regarded as a forward problem for a subsequent attempt to investigate the inverse problem of quantifying crack size from scattered wave measurements. Contribution of the findings to non-destructive crack detection and characterisation in SHM are also briefly discussed.",
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Vien, BS, Rose, LRF & Chiu, WK 2017, Experimental and computational investigations on the scattering of fundamental symmetric lamb wave by edge crack at a circular hole in an isotropic plate. in 9th Australasian Congress on Applied Mechanics, ACAM 2017. vol. 2017-November, National Committee on Applied Mechanics, Australasian Congress on Applied Mechanics 2017, Sydney, Australia, 27/11/17.

Experimental and computational investigations on the scattering of fundamental symmetric lamb wave by edge crack at a circular hole in an isotropic plate. / Vien, B. S.; Rose, L. R.F.; Chiu, W. K.

9th Australasian Congress on Applied Mechanics, ACAM 2017. Vol. 2017-November National Committee on Applied Mechanics, 2017.

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

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AB - Fuel vent holes in aircraft components are vulnerable to fatigue cracking and remain a significant challenge for structural integrity management. There is significant interest in using Lamb wave propagation for structural health monitoring (SHM) in such cases due to their low attenuation and rapid wide-area coverage. Unlike bulk waves, solving Lamb wave applications are more complicated and, thus, require further research, both experimentally and computationally, in order to fully exploit their potential for SHM. This paper presents experimental and computational studies of the interaction between the fundamental symmetrical mode S0 and a small through-thickness edge crack at a circular hole in an isotropic plate. The incident S0 wave is generated by a pinching force whose time dependence is a 5.5-cycle Hann-windowed toneburst of centre frequency below the cut-off for the first order Lamb wave modes (SH1). 2D Fast Fourier Transformation (2D FFT) is performed to produce the dispersion curves to identify the scattered Lamb wave mode. The scattering pattern and dependence of scattering amplitude on small crack size are reported and shown to be equivalent to a point source consisting of a particular combination of force doublets, and that the amplitude of the scattered field increases quadratically with crack length a. This study is regarded as a forward problem for a subsequent attempt to investigate the inverse problem of quantifying crack size from scattered wave measurements. Contribution of the findings to non-destructive crack detection and characterisation in SHM are also briefly discussed.

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Vien BS, Rose LRF, Chiu WK. Experimental and computational investigations on the scattering of fundamental symmetric lamb wave by edge crack at a circular hole in an isotropic plate. In 9th Australasian Congress on Applied Mechanics, ACAM 2017. Vol. 2017-November. National Committee on Applied Mechanics. 2017