Analysis of Acoustic Pulses Reflected From Fiber-Reinforced Composite Laminates

Mal, Ajit; Yin, Ching-Chung; Bar‐Cohen, Yoseph

doi:10.1115/1.2899478

Cited by 16 publications

(4 citation statements)

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“…In three dimensions, scattering by transversely isotropic cylinders is studied in Honarvar and Sinclair (1996) and Niklasson and Datta (1998) among others, while an extension of the methodology proposed in Honarvar and Sinclair (1996) to the case of a cylindrical shell is found in Kim and Ih (2003). Other examples of scattering problems involving transversely isotropic solids are Kundu and Boströ m (1992) and Mal et al (1992). On the other hand, when it comes to materials with a higher degree of anisotropy, the investigation of the wave propagation and scattering phenomena is based upon numerical methods such as the finite element method (FEM; Lord et al, 1990), the elastodynamic finite integration technique (EFIT; Fellinger et al, 1995), the boundary element method (BEM; Wang et al, 1996) and the strip element method (SEM; Liu and Achenbach, 1995).…”

Section: Introductionmentioning

confidence: 98%

On the investigation of elasticity equation for orthotropic materials and the solution of the associated scattering problem

Anagnostopoulos

Charalambopoulos

Massalas

2005

International Journal of Solids and Structures

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The present work concerns the investigation of the two-dimensional direct scattering problem of time-harmonic elastic waves from bounded anisotropic components of isotropic media. We obtain a Fourier series expansion for the elastic field in the interior of the anisotropic inclusion based on a suitable diagonalization applied to the underlying differential system and a plane wave expansion of the sought field, provided that the inclusion exhibits orthotropic symmetry. This expansion is then exploited to acquire a semi-analytical solution to the associated elastic transmission scattering problem. Numerical results for several geometric configurations and varying degree of anisotropy are presented revealing the pronounced effect of the specific anisotropic character on the scattering mechanism.

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Section: Introductionmentioning

confidence: 98%

On the investigation of elasticity equation for orthotropic materials and the solution of the associated scattering problem

Anagnostopoulos

Charalambopoulos

Massalas

2005

International Journal of Solids and Structures

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“…A good understanding of Lamb wave propagation and a good knowledge of the damage modes developed in structures are needed in order to apply NDT with optimal efficiency. Certain authors should be consulted [1][2][3][4][5][6][7][8][9][10][11][12][13] to gain a better understanding of Lamb waves and knowledge of propagation in anisotropic composite materials. Recently, Lamb waves have become widely used for NDT applications [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Lamb Wave Interaction with Impact-induced Damage in Aircraft Composite: Use of the A0 Mode Excited by Air-coupled Transducer

Kaczmarek

2003

Journal of Composite Materials

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A novel technique has been experimented involving the use of an air-coupled transducer to excite Lamb mode in composite material, a pinducer to pick-up local response and a turn-table set-up to reveal impact damage-induced anisotropy. So, a fundamental antisymmetric A0 Lamb mode has been excited under unusual conditions. Its efficiency for detecting impact-induced damage in a multilayered thin quasi-isotropic carbon–epoxy composite laminate has been demonstrated and the knowledge on the A0 Lamb mode interaction with the damage has been improved using an original mapping. Some material characteristics have been obtained. Intrinsic material attenuation of this guided mode at a frequency of 370 kHz and a frequency-thickness product of 740 kHz mm has been assessed and in-plane energy distribution of the A0 mode has been mapped, revealing a relatively directive acoustic field. However, the composite material exhibits slightly anisotropic acoustic behaviour due to a lack of fibres in certain directions. Interactions between the A0 mode and multidelamination of the critical area were also investigated. In-plane mappings of the ultrasonic field have revealed two main phenomena: attenuation and scattering due to damage. Splitting of the ultrasonic wave was observed, creating a region of geometric shadow where attenuation occurs. It is shown on the mappings that the energy lost in this direction of propagation appears in other directions. An increase in the received energy was detected in certain directions, showing that the damage can be considered as a soft scattering centre.

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“…More recent studies of beam reflection from planar structures have also been carried out. [5][6][7] The related problem in structural acoustics of reflection of sound from cylinders [8][9][10] has dealt with planar incident fields, where the sound wave field does not vary appreciably over the cylinder diameter. A more thorough review of this literature can be found in Ref.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic beam reflection from fluid-loaded cylindrical shells

Cloutier

Safaeinili

Chimenti

et al. 1998

Journal of Applied Physics

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The interaction of ultrasonic acoustic transducers with cylindrical shells in pitch-catch mode has been measured and predicted using a two-dimensional theoretical model. The measurements of the received voltage amplitude at selected frequencies and incidence angles are presented as a function of scanned angular position at fixed radius and beam launch angle. In the forward model, the received voltage is expressed in terms of a spectral integral whose integrand contains the spectral amplitudes of the transmitter and the receiver, and a spectral global reflection coefficient that accounts for the pressure wave interaction with the fluid-or air-loaded shell. The transmitter and receiver are modeled using the complex-transducer-point technique to simulate emitting and receiving electro-acoustic transducers with Gaussian profiles. The receiver voltage integral is reduced by uniform high-frequency saddle point asymptotics to closed form solutions for the dominant contributions from the specular reflected and ͑excited͒ leaky wave fields. We find generally good agreement between the model prediction and the experimental results, particularly near the voltage maximum. Experimental data are also shown for a solid cylinder, demonstrating in a time-angle plot the existence of whispering gallery modes, which is verified analytically.

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Analysis of Acoustic Pulses Reflected From Fiber-Reinforced Composite Laminates

Cited by 16 publications

References 0 publications

On the investigation of elasticity equation for orthotropic materials and the solution of the associated scattering problem

On the investigation of elasticity equation for orthotropic materials and the solution of the associated scattering problem

Lamb Wave Interaction with Impact-induced Damage in Aircraft Composite: Use of the A0 Mode Excited by Air-coupled Transducer

Ultrasonic beam reflection from fluid-loaded cylindrical shells

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