Low Frequency Flexural Wave Propagation in Laminated Composite Plates

Tang, B.; Henneke, E. G.; Stiffler, Richard C.

doi:10.1007/978-1-4757-1965-9_4

Cited by 28 publications

(11 citation statements)

References 11 publications

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“…For a further description of plate theory and how the laminate stiffnesses relate to the dispersion curve, the reader is referred to Tang et al 19 For propagation in the 0°direction, the effects on the flexural dispersion curve of reducing each of the stiffness constants in Eq. ͑4͒ by 25% are shown in Fig.…”

Section: Theorymentioning

confidence: 99%

Lamb wave characterization of the effects of long-term thermal-mechanical aging on composite stiffness

Seale

Madaras

1999

The Journal of the Acoustical Society of America

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Lamb waves offer a promising method of evaluating damage in composite materials. The Lamb wave velocity is directly related to the material parameters, so an effective tool exists to monitor damage in composites by measuring the velocity of these waves. The Lamb Wave Imager (LWI) uses a pulse/receive technique that excites an antisymmetric Lamb mode and measures the time-of-flight over a wide frequency range. Given the material density and plate thickness, the bending and out-of-plane shear stiffnesses are calculated from a reconstruction of the dispersion curve. In this study, the time-of-flight as well as the elastic stiffnesses D11, D22, A44, and A55 for composite samples which have undergone combined thermal and mechanical aging are obtained. The samples examined include a baseline specimen with 0 cycles, specimens which have been aged 2350 and 3530 cycles at high strain levels, and one specimen aged 3530 cycles at low strain levels.

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Section: Theorymentioning

confidence: 99%

Lamb wave characterization of the effects of long-term thermal-mechanical aging on composite stiffness

Seale

Madaras

1999

The Journal of the Acoustical Society of America

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“…The experimental data shown in Figure 5 have the characteristics of the dispersion curve of the A o Lamb mode, although the agreement between Lamb theory and experimental results is not quite as good as for the isotropic case, especially as the fh product increases (decreasing wavelength). The difference can be attributed to the fact that transverse shear deformation effects, which are neglected in the formulation of the classical plate theory, are significant in the case of laminated plates due to the relatively low transverse shear modulus [19]. It can be seen from Figure 4 that Lamb wave and beam theory can be used to successfully predict the dispersion curves of an isotropic material.…”

Section: Phase Velocity Measurementmentioning

confidence: 85%

Lamb Wave‐BasedSHMfor Laminated Composite Structures

Soutis

2008

Encyclopedia of Structural Health Monitoring

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This article examines the application of low‐frequency Lamb waves for the detection of delaminations (interlaminar cracking) in thick composite laminates. Surface‐mounted piezoelectric devices are excited with a tone burst of a few cycles generating a stress wave that propagates along the structure. Experiments carried out on composite beam specimens are discussed where wave propagation distances over 2 m are achieved and delaminations as small as 1 cm 2 are successfully identified. The resonance spectrum method, which is based on the study of spectra obtained by forced mechanical resonance of samples using sine‐sweep excitation, is used for measuring the A o Lamb‐mode phase velocity. Finite element (FE) analyses of wave generation and propagation in wide laminated plates are also presented. The feasibility of employing piezoelectric devices for the development of smart structures, where a small and lightweight transducer system design is required, is also demonstrated.

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“…The difference can be attributed to the fact that transverse shear deformation effects, which are neglected in the formulation of the classical plate theory, are significant in the case of laminated plates due to the relatively low transverse shear modulus. 18 It can be seen from Fig. 4 that Lamb wave and beam theory can be used to successfully predict the dispersion curves of an isotropic material.…”

Section: B Phase Velocity Measurementmentioning

confidence: 97%

Real-time nondestructive evaluation of fiber composite laminates using low-frequency Lamb waves

Valdés

Soutis

2002

The Journal of the Acoustical Society of America

104

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Amid the nondestructive evaluation techniques available for the inspection of composite materials, only a few are suitable for implementation while the component is in service. The investigation examines the application of Lamb waves at low-frequency-thickness products for the detection of delaminations in thick composite laminates. Surface-mounted piezoelectric devices were excited with a tone burst to generate elastic waves in the structure. Experiments were carried out on composite beam specimens where wave propagation distances over 2 m were achieved and artificially induced delaminations as small as 1 cm2 were successfully identified. The feasibility of employing piezoelectric devices for the development of smart structures, where a small and lightweight transducer system design is required, has been demonstrated. The resonance spectrum method, which is based on the study of spectra obtained by forced mechanical resonance of samples using sine-sweep excitation, has been proposed as a technique for measuring the A0 Lamb mode phase velocity. The finite-element method was also used to investigate qualitatively the dynamic response of laminates to wave propagation. Several locations and spatial distribution of the actuators were examined showing the advantages of using transducers arrays for the inspection of large structures.

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Low Frequency Flexural Wave Propagation in Laminated Composite Plates

Cited by 28 publications

References 11 publications

Lamb wave characterization of the effects of long-term thermal-mechanical aging on composite stiffness

Lamb wave characterization of the effects of long-term thermal-mechanical aging on composite stiffness

Lamb Wave‐BasedSHMfor Laminated Composite Structures

Real-time nondestructive evaluation of fiber composite laminates using low-frequency Lamb waves

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