An inverse problem of reconstructing the electrical and geometrical parameters characterising airframe structures and connector interfaces

Mackay, Cameron; Hayward, D.; Mulholland, Anthony J.; McKee, Sean; Pethrick, Richard A.

doi:10.1080/17415970600556796

Cited by 3 publications

(6 citation statements)

References 8 publications

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“…A more sophisticated modelling of the wave propagation in a model joint has been undertaken. 134,135 Ideally, one would like to be able to create the waveguide structure without knowing the breadth or thickness or the joint or its length. The dielectric permittivity can be obtained from the frequency dependent studies and assumptions can be made above the conductivity of the substrate.…”

Section: Visualisation Of the Changes In Structure From The Dielectrimentioning

confidence: 99%

Design and ageing of adhesives for structural adhesive bonding – A review

Pethrick

2014

Proceedings of the Institution of Mechanical Engineers, Part L:

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This review outlines some of the issues which have to be addressed when selecting an adhesive for a particular structural adhesive bonding application. The designer may find that a number of adhesives provide the required load bearing properties and the selection may require a more detailed consideration of the processes involved in the fabrication of the joint, the temperature over which it is to work and the environment in which it will have to operate. The article attempts to provide the reader with an insight into the effects of factors such as time and temperature used in the cure process, details of the components in the mixture and the effects of various additives on the physical properties of the adhesives which are created. The performance of an adhesive may vary with time as a consequence of stress-induced changes which are triggered by thermal effects or by hygrothermal factors. The review considers joints created using metal substrates and carbon fibre composites. The performance and durability of an adhesive bond is critically dependent on the stability of the interface between the adhesive and adherend and is sensitive to the pre-treatment processes used in the creation of the bond. The review outlines how broadband dielectric measurements can be used to non-destructively monitor the cure of adhesive bonds and the processes involved in ageing of joint. The dielectric method gives an insight into the fundamental processes which are giving rise to the changes in the mechanical properties of the joint as they age.

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Section: Visualisation Of the Changes In Structure From The Dielectrimentioning

confidence: 99%

Design and ageing of adhesives for structural adhesive bonding – A review

Pethrick

2014

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…A fast and easy to compute iterative method extracted from the analytical solution is preferred. 28 The technique is general and just a detailed example is given for Eq. ͑14͒.…”

Section: Appendix A: Iterative Solutions Of Linear First Order Differmentioning

confidence: 99%

“…The transmission data are not often used 28 and may even trap the optimizer. 27 Therefore, in the following, only the minimization of the reflection data is detailed.…”

Section: Notes About the Oblique Incidencementioning

confidence: 99%

“…[21][22][23] However, the invariant imbedding technique, which will be detailed in the next section, allows a transformation that uses the known characteristic impedance Z 0 = f c f of the saturating fluid instead. 27,28 As a schematic explanation, one considers that at the initial state, and for all x Ͻ L, there is only the ambient fluid of characteristic impedance Z 0 . Then, layer after layer, the inhomogeneous porous material is constructed from x = L to x = 0.…”

Section: ͑8͒mentioning

confidence: 99%

“…[21][22][23][24][25][26] More recently, similar methods, together with an optimization approach, were developed in the frequency domain. 27,28 The latter are more suitable to model wave propagation in rigid frame macroscopically inhomogeneous porous materials in all its complexity, i.e., over a large frequency range for which the five parameters have to be accounted for. Moreover, this allows us to work with band-limited data, which is more appropriate when one has to deal with measured data.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reconstruction of material properties profiles in one-dimensional macroscopically inhomogeneous rigid frame porous media in the frequency domain

Ryck

Lauriks

Leclaire

et al. 2008

The Journal of the Acoustical Society of America

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The present paper deals with the inverse scattering problem involving macroscopically inhomogeneous rigid frame porous media. It consists of the recovery, from acoustic measurements, of the profiles of spatially varying material parameters by means of an optimization approach. The resolution is based on the modeling of acoustic wave propagation in macroscopically inhomogeneous rigid frame porous materials, which was recently derived from the generalized Biot's theory. In practice, the inverse problem is solved by minimizing an objective function defined in the least-square sense by the comparison of the calculated reflection ͑and transmission͒ coefficient͑s͒ with the measured or synthetic one͑s͒, affected or not by additive Gaussian noise. From an initial guess, the profiles of the x-dependent material parameters are reconstructed iteratively with the help of a standard conjugate gradient method. The convergence rate of the latter and the accuracy of the reconstructions are improved by the availability of an analytical gradient.

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Non-destructive evaluation (NDE) of composites: dielectric methods for testing adhesive bonds in composites

Pethrick

2013

Non-Destructive Evaluation (NDE) of Polymer Matrix Composites

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An inverse problem of reconstructing the electrical and geometrical parameters characterising airframe structures and connector interfaces

Cited by 3 publications

References 8 publications

Design and ageing of adhesives for structural adhesive bonding – A review

Design and ageing of adhesives for structural adhesive bonding – A review

Reconstruction of material properties profiles in one-dimensional macroscopically inhomogeneous rigid frame porous media in the frequency domain

Non-destructive evaluation (NDE) of composites: dielectric methods for testing adhesive bonds in composites

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