Wave steering effects in anisotropic composite structures: Direct calculation of the energy skew angle through a finite element scheme

Chronopoulos, Dimitrios

doi:10.1016/j.ultras.2016.08.020

Cited by 17 publications

(15 citation statements)

References 28 publications

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“…As guided wave propagation in thin plates is dispersive, the velocity of wave propagation depends on the frequency and the dispersion relations need to be known. These guided waves techniques are very efficient in traditional isotropic or even orthotropic materials as their wave propagation characteristics have been thoroughly investigated [10]. However in strongly anisotropic composites, such as woven composites for example, these properties are not straightforward to obtain.…”

Section: Introductionmentioning

confidence: 99%

On the Experimental Validation of the Numerical Calculation of the Dispersion Relations of Complex Woven Composites

Thierry¹,

Mesnil²,

Chronopoulos³

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Section: Introductionmentioning

confidence: 99%

On the Experimental Validation of the Numerical Calculation of the Dispersion Relations of Complex Woven Composites

Thierry¹,

Mesnil²,

Chronopoulos³

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…The WFE has recently found applications in predicting the vibroacoustic and dynamic performance of composite panels and shells [11,12,13,14,15,16,17] , with pressurized shells [18,19] and complex periodic structures [20,21,22] having been investigated. The variability of acoustic transmission through layered structures [23,24], as well as wave steering effects in anisotropic composites [25] have been modelled through the same methodology.…”

Section: Introductionmentioning

confidence: 99%

Wave sensitivity analysis for periodic and arbitrarily complex composite structures

Chronopoulos

Collet²,

Ichchou

2017

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Purpose: This paper presents the development of a numerical continuumdiscrete approach for computing the sensitivity of the waves propagating in periodic composite structures. The work can be directly employed for evaluating the sensitivity of the structural dynamic performance with respect to geometric and layering structural modifications.Design/methodology/approach: A structure of arbitrary layering and geometric complexity is modelled using solid FE. A generic expression for computing the variation of the mass and the stiffness matrices of the structure with respect to the material and geometric characteristics is hereby given.The sensitivity of the structural wave properties can thus be numerically determined by computing the variability of the corresponding eigenvalues for the resulting eigenproblem. The exhibited approach is validated against the FD method as well as analytical results.Findings: An intense wavenumber dependence is observed for the sensitivity results of the sandwich structure. This exhibits the importance and potential of the presented tool with regard to the optimization of layered structures for specific applications. The model can also be used for computing the effect of the inclusion of smart layers such as auxetics and piezoelectrics.Originality/value: The paper presents the first continuum-discrete approach specifically developed for accurately and efficiently computing the sensitivity of the wave propagation data for periodic composite structures irrespective of their size. The considered structure can be of arbitrary layering and material characteristics as FE modelling is employed.

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“…The WFE method has recently found applications in predicting the vibroacoustic and dynamic performance of composite panels and shells [34,35,36,37,38,39,40] , with pressurized shells [41,42] and complex periodic structures [43,44,45,46] having been investigated. The variability of acoustic transmission through layered structures [47,48], as well as wave steering effects in anisotropic composites [49] have been modelled through the same methodology . The same FE based approach has been employed in order to compute the reflection and transmission coefficients of waves impinging on linear joints of finite dimensions [50,51].…”

Section: Introductionmentioning

confidence: 99%

Quantification of Guided Wave Interaction Effects With Localised Structural Nonlinearities in Complex, Composite Structures

Thierry¹,

Chronopoulos²,

Ashcroft³

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. The extensive usage of composite materials in modern industrial applications implies a great range of possible structural failure modes for which the structure has to be frequently and thoroughly inspected. Nonlinear guided wave inspection techniques have been continuously gaining attention during the last decade. This is primarily due to their sensitivity to very small sizes of localized damage. A number of complex transformation phenomena take place when an elastic wave impinges on a nonlinear segment, including the generation of higher and sub-harmonics. Moreover, the transmission and reflection coefficients of each wave type become amplitude dependent. In this work, a generic Finite Element (FE) based computational scheme is presented for quantifying guided wave interaction effects with Localized Structural Nonlinearities (LSN) within structures of arbitrary layering and geometric complexity. Amplitude dependent guided wave reflection, transmission and conversion is computed through a Wave and Finite Element (WFE) method. The scheme couples wave propagation properties within linear structural waveguides to a LSN and is able to compute the generation of higher and sub-harmonics for each wave type through a harmonic balance projection. A Newton-like iteration scheme is employed for solving the system of nonlinear differential equations. Numerical case studies are exhibited for a set of waveguides coupled through a joint exhibiting nonlinear mechanical behaviour.

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Wave steering effects in anisotropic composite structures: Direct calculation of the energy skew angle through a finite element scheme

Cited by 17 publications

References 28 publications

On the Experimental Validation of the Numerical Calculation of the Dispersion Relations of Complex Woven Composites

On the Experimental Validation of the Numerical Calculation of the Dispersion Relations of Complex Woven Composites

Wave sensitivity analysis for periodic and arbitrarily complex composite structures

Quantification of Guided Wave Interaction Effects With Localised Structural Nonlinearities in Complex, Composite Structures

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