Numerical simulation of Lamb wave propagation in metallic foam sandwich structures: a parametric study

Hosseini, Seyed Mohammad Hossein; Kharaghani, Abdolreza; Kirsch, Christoph; Gabbert, Ulrich

doi:10.1016/j.compstruct.2012.10.039

Cited by 28 publications

(15 citation statements)

References 19 publications

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“…where a(t) is the normalized acceleration [23]. e A0 and S0 wave modes are the dominant ones in the propagating wave; therefore, the calculated energy corresponds mostly to the energy of these two wave modes at one measurement node.…”

Section: Gw Energy Transfermentioning

confidence: 99%

“…Modelling the foam or honeycomb core layer using solid elements requires homogenization assumptions. Studies show that assuming a homogeneous isotropic material for the foam or honeycomb core leads to reasonable accuracy for the fundamental wave modes in the low range of frequencies [10,23]. e simulations are mostly performed using explicit dynamic procedures, and Abaqus is the commercial code which has been widely used for these types of studies [5,6,8,13,20].…”

Section: Introductionmentioning

confidence: 99%

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Guided Wave Energy Transfer in Composite Sandwich Structures and Application to Defect Detection

Shoja

Berbyuk

Boström

2018

Shock and Vibration

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In this study, energy transmission of the guided waves propagating in composite sandwich structures is investigated in a wide range of frequencies using numerical simulations. e effects of different potential defects on the guided wave energy transmission are explored in such structures. Furthermore, the accuracy of homogenization methods for finite element modelling of guided wave propagation in sandwich structures is studied with the aim of reducing the computational burden of the simulations in the low range of frequencies. A 2D finite element model is developed and verified by comparing the results with the dispersion curves. In order to examine homogenization methods, the homogenized stiffness matrices of the sandwich material and the laminate skin are calculated using classical laminate theory. Results show that core-skin debonding causes absence of wave energy leakage from the skin to the core material in that region in a specific range of frequencies. e results are also obtained for the delamination within the skin and compared with the healthy material. Finally, for the guided waves in the low range of frequencies, it is possible to use the homogenization methods to create the finite element models and reduce the solution time.

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Section: Gw Energy Transfermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Guided Wave Energy Transfer in Composite Sandwich Structures and Application to Defect Detection

Shoja

Berbyuk

Boström

2018

Shock and Vibration

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“…[9][10][11][12] There have been many studies carried out related to UGW methods showing their advantages over other NDT techniques. [13][14][15][16][17] However, in the case when the internal structure of the multilayered material is not uniform nor known, the excitation and interpretation of the UGW signals received become very complicated and very sensitive to the adjustment of operating parameters of the experimental set-up (type of the excited modes of UGW, operation frequency etc.). 5,18,19 And,¯rst of all, before using the UGW for defect detection, the knowledge about the UGW propagation e®ects in a selected structure is required.…”

Section: Introductionmentioning

confidence: 99%

An Adjustment-Free NDT Technique for Defect Detection in Multilayered Composite Constructions Using Ultrasonic Guided Waves

Samaitis

2014

Int. J. Str. Stab. Dyn.

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In recent years, the novel lightweight honeycomb sandwich structures have been applied in a wide range of industries. However, daily operational conditions, fatigue, as well as various defects developed during exploitation lead to the risk of structure failure. To meet safety and economical requirements, such structures must be tested. In this paper, an ultrasonic pitchcatch technique based on ultrasonic guided waves (UGW) for detection of defects in honeycomb sandwich structures is proposed. The technique is based on simultaneous scanning of a pair of contact type transmitting and receiving transducers positioned at¯xed distance from each other. The proposed technique has been veri¯ed by the experiments and simulations on a honeycomb sandwich structure with an aluminium core and carbon¯ber skin. The results have shown that di®erent types of internal nonhomogeneities, such as changes in internal multilayered structure, skin delaminations or disbonds between the skin and the core, give the e®ects of amplitude and phase velocity deviations, which can be detected with accuracy reasonable for practical applications.

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“…It was shown in [ 35 ] that morphological features of those models such as the number of faces by cell and edges by cell face significantly diverge from real foams, which lead to another 11-faced polyhedral model to be proposed. Next to those polyhedral cell models, some simple geometries based on regular bars or plates assemblies were also used [ 29,21,18 ]. Within such models, plate thickness or lattice node positions can be randomized to account for the natural variability of the material.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, general conclusions which ideally should require broader parametric studies are difficult to reach. Another class of models that may bring valuable insight on this aspect makes use of idealized microstructure geometry descriptions to explore and understand elementary mechanisms related with the particular morphology of the material [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. In spite of the fact that such models cannot fully resemble scanned data, they provide the opportunity to single out the influence of specific morphological parameters of the material for various physical phenomena.…”

Section: Introductionmentioning

confidence: 99%

An advanced approach for the generation of complex cellular material representative volume elements using distance fields and level sets

2015

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A general and widely tunable method for the generation of Representative Volume Elements ( RVEs ) for cellular materials based on distance and level set functions is presented. The approach is based on random tessellations constructed from random inclusion packings. A general methodology to obtain arbitraryshaped tessellations to produce disordered foams is presented and illustrated. These tessellations can degenerate either in classical Voronoï tessellations potentially additively weighted depending on properties of the initial inclusion packing used, or in Laguerre tessellations through a simple modification of the formulation. A versatile approach to control the particular morphology of the obtained foam is introduced. Specific local features such as concave triangular Plateau borders and non-constant thickness heterogeneous coatings can be built from the tessellation in a straightforward way and are tuned by a small set of parameters with a clear morphological interpretation.

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Numerical simulation of Lamb wave propagation in metallic foam sandwich structures: a parametric study

Cited by 28 publications

References 19 publications

Guided Wave Energy Transfer in Composite Sandwich Structures and Application to Defect Detection

Guided Wave Energy Transfer in Composite Sandwich Structures and Application to Defect Detection

An Adjustment-Free NDT Technique for Defect Detection in Multilayered Composite Constructions Using Ultrasonic Guided Waves

An advanced approach for the generation of complex cellular material representative volume elements using distance fields and level sets

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