Effective elastic properties of layered composites considering non-uniform imperfect adhesion

Brito-Santana, Humberto; Medeiros, Ricardo de; Ferreira, A.J.M.; Rodrı́guez-Ramos, Reinaldo; Tita, Volnei

doi:10.1016/j.apm.2018.01.009

Cited by 17 publications

(13 citation statements)

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“…The novelty of this contribution is that the effective properties of laminated composites with localized delamination are calculated via AHM (with two-scale asymptotic homogenization method) and via an in-house finite element software written in Julia language. In fact, the present work is a continuation of a paper previously published by the authors [23], which was an investigation of debonding between two isotropic materials by using AHM and a commercial finite element software. Thus, in the present paper, four different stacking sequences of laminated composites are evaluated ( [30/ − 30] n and [45/ − 45] n ) with an epoxy layer in the interface of the plies, considering different values for the interface thickness between layers and for different delamination extensions.…”

Section: Introductionmentioning

confidence: 90%

Delamination influence on elastic properties of laminated composites

et al. 2018

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The present work aims to predict the behavior of effective elastic properties for laminated composites, considering localized damage in the interface between two layers. In practical terms, the damage in the adhesion, which influences the effective elastic properties of a laminate, is evaluated like a delamination between adjacent layers. Thus, the effective properties of laminated composites with different delamination extensions are calculated via finite element method and two-scale asymptotic homogenization method. It is investigated how the properties of the laminated composites are affected by the delamination extension and the thickness of the interface between layers. It is possible to conclude that the effective coefficient values decrease as the damage extension increases due to the fact that the delamination area increases. Besides, for all effective coefficients, except the effective coefficients C * 12 , C * 13 , and C * 23 , in the case without delamination, the coefficients decrease as the adhesive region thickness increases, and almost all coefficients decrease for complete separation of the interface. Numerical and analytical results are compared in order to show the potentialities and limitations of the proposed approaches. Finally, a numerical approach is used to simulate a specific case, where the interface is considered a functionally graded material.

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Section: Introductionmentioning

confidence: 90%

Delamination influence on elastic properties of laminated composites

et al. 2018

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“…are periodic functions with a periodic length equal to l. It is possible to determine equivalent expressions to those reported in Ref. [31] for the elastic case. Therefore, different equations are obtained which depends on the e parameter.…”

Section: Formulation Of the Problemmentioning

confidence: 96%

“…From the mathematical point of view, this situation must be treated as a 2D problem written with partial derivates, see Ref. [31]. Imperfection region C is divided in N partitions C r and each one has a uniform imperfection parameters, then, the functions U…”

Section: Formulation Of the Problemmentioning

confidence: 99%

“…Limit cases for the present model are verified, i.e., the analytical expressions [Eq. (31)] reproduce the material properties for each constituent when the volume fraction of layer 1 is equal to zero or one. Besides, the Eq.…”

Section: Formulation Of the Problemmentioning

confidence: 99%

“…The general method to calculate the effective properties is performed assuming the point group 2 mm for material symmetry. The effective properties of layered composites considering non-uniform imperfect adhesion has been investigated in [31], only considering elastic laminated composites. Thus, the present work is an extension of previous results where piezoelectric constituents are incorporated.…”

Section: Introductionmentioning

confidence: 99%

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Behavior of piezoelectric layered composites with mechanical and electrical non-uniform imperfect contacts

et al. 2020

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In this work, the two scales asymptotic homogenization method (AHM) is applied for determining the effective coefficients of laminated piezoelectric composite with periodic structure under nonuniform electrical and mechanical imperfect contact conditions. The analytical expressions of the local problems and the effective coefficients as result of the AHM are explicitly described. The constituent materials have properties belonging to 2 mm symmetry point group. Numerical values of the effective coefficients are reported and compared with limit cases, where perfect and uniform imperfect contact conditions are considered. Good agreements are found for these comparisons. Hence, the effect of the nonuniform imperfect contact conditions on the effective coefficients can be analyzed.

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