Investigation of Incident Lamb Wave Parameters on Detection of Composite Delamination

Jha, Ratneshwar; Kim, Inho; Widana-Gamage, Dulip

doi:10.1115/smasis2010-3780

Cited by 2 publications

(2 citation statements)

References 7 publications

(6 reference statements)

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“…The phase difference is somewhat smaller at lower frequencies. Thus the experimental results for the selected frequency range (20 kHz to 80 kHz with 5 kHz increments) show significant effects of actuation frequency on both energy and phase difference angle [2,[11][12]. Further studies will include understanding the relationship between actuation frequencies and energy and phase difference observed and different size of delamination area.…”

Section: Effect Of Tone Burst Center Frequency On Instantaneous Phasementioning

confidence: 90%

Wavelet Spectral Finite Elements for Wave Propagation in Composite Plates

Jha¹

2012

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information The principal goal of this research is to advance the technology of structural health management (SHM) for composite structures. Wave propagation based methods have shown promise for SHM of composite structures. The spectral finite elements (SFE) method is highly suitable for wave propagation analysis due to its frequency domain approach which yields models that are many orders smaller than conventional FEM. Wavelet spectral finite element (WSFE) method overcomes the "wrap around" problem to accurately model 2-D plate structures of finite dimensions. The specific accomplishments of the research are: developed WSFE model for damaged composite plate with transverse crack; validated WSFE modeling of Lamb wave propagation in healthy composite plates through experimental measurements; implemented 'baseline-free' Damage Force Indicator method for delamination detection using dynamic stiffness matrix from WSFE model of healthy plate; developed Modified Time Reversal method for Lamb wave based 'baseline-free' damage diagnostics; and investigated effect of tone burst center frequency on instantaneous phase based delamination detection.structural health management, wavelet spectral finite element, composite structures, damage detection U U U UU 16Ratneshwar Jha (315) 268-7686

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Section: Effect Of Tone Burst Center Frequency On Instantaneous Phasementioning

confidence: 90%

Wavelet Spectral Finite Elements for Wave Propagation in Composite Plates

Jha¹

2012

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“…The experimental setup ( Figure 2) and results for Lamb wave measurements are discussed in Jha et al (2010). The composite plate used in this study was fabricated from AS4/3501-6 carbonepoxy pre-preg using vacuum bagging and oven curing technique.…”

Section: Experimental Investigationsmentioning

confidence: 99%

Composite Delamination Detection Using Wavelet Spectral Finite Element and Damage Force Indicator Method

Widana-Gamage

Kim

Jha

et al. 2011

52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

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This paper presents the detection of delamination in composite plates using the Damage Force Indicator (DFI) method. The global dynamic stiffness matrix of the healthy structure is obtained from Wavelet Spectral Finite Element (WSFE) model condensed to the degrees of freedom consistent with experimental measurements (out-of-plane displacements). The displacement vector for the damaged structure is measured using a scanning laser vibrometer. It is shown that the DFI method gives correct identification of damage. Wavelet Spectral Finite Element (WSFE)Conventional finite element method (FEM) is not suited for wave propagation problems since the element size should be comparable to wavelength which is very small at high frequencies.Typically, 20 elements should span a wavelength for accurate predictions. This results in large

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Investigation of Incident Lamb Wave Parameters on Detection of Composite Delamination

Cited by 2 publications

References 7 publications

Wavelet Spectral Finite Elements for Wave Propagation in Composite Plates

Wavelet Spectral Finite Elements for Wave Propagation in Composite Plates

Composite Delamination Detection Using Wavelet Spectral Finite Element and Damage Force Indicator Method

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