Delamination influence on elastic properties of laminated composites

Abstract

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.

Dynamic modelling and analysis of smart carbon nanotube-based hybrid composite beams: Analytical and finite element study

“…It should be noted that the interface conditions has significant impact on the elastic properties of composites at higher fibre volume fraction. [32][33][34] The CNTs can be utilized as nanofillers in the conventional matrices due to their high electro-thermomechanical properties to improve the properties of the composites. The helical microtubules of graphitic carbon, CNTs have drawn significant attention among researchers since 1991 to predict its thermo-electro-mechanical properties.…”

Analysis of unbalanced laminate composites with imperfect interphase: Effective properties via asymptotic homogenization method

“…Over the past years, several numerical homogenization methods have been used to accomplish that task, as seen in. [1][2][3][4] Here, one can highlight the Asymptotic Expansion Method (AHM), [5][6][7][8][9][10][11] a rigorous mathematical formulation used to assess the behavior of heterogeneous materials. On a linear elasticity context, the AHM considers a two-scale asymptotic approach to account for the small variations on the mechanical properties of the heterogeneous media hence obtaining the average or homogenized properties of the media.…”

“…Despite the numerical homogenization methods for obtaining the effective elastic properties of a heterogeneous medium being frequent in literature, the assessment of the normal-shear coupled components of the elasticity tensor is rarely observed. 5,6 Thus, this work focus on the discussion and application of the Asymptotic Homogenization Method to obtain all of the 21 independent components of the elasticity tensor of three-dimensional media, including the coupled components. A unit cell, under periodicity constraints, is considered to represent a heterogeneous media and the derivation of the effective properties of the media are obtained both analytically and numerically.…”

“…Despite the numerical homogenization methods for obtaining the effective elastic properties of a heterogeneous medium being frequent in literature, the assessment of the normal-shear coupled components of the elasticity tensor is rarely observed. 5,6…”

Dynamic analysis of magneto-electro-elastic nanostructures using node-based smoothed radial point interpolation method combined with micromechanics-based asymptotic homogenization technique

“…AHM can be used to obtain a reliable solution to nanostructures (Tahani and Safarian, 2019). Owing to its super accuracy and high efficiency, AHM was applied to explore the effective material properties for microstructure design (Brito-Santana et al, 2019; Espinosa-Almeyda et al, 2017; Hoang and Takano, 2019). Sixto-Camacho et al (2017) studied the boundary value problems of linear thermo-MEE heterogeneous composites by using AHM.…”