Title

ANÁLISE EXPERIMENTAL E NUMÉRICA DE 1 DELAMINAÇÃO EM MATERIAIS COMPÓSITOS

EXPERIMENTAL AND NUMERICAL DELAMINATION ANALYSIS FOR COMPOSITE MATERIALS

Authorship

Salerno, Gigliola

Salerno, Gigliola

I am this author

DOI

10.5151/2594-5327-17836

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Abstract

Materiais compósitos se transformaram em uma vantajosa opção devido às altas resistência e rigidez específicas; atualmente as aplicações são crescentes. Os mecanismos de dano de um material compósito, preparado com fibras unidirecionais, são complexos, sendo o processo de delaminação decisivo para a perda da integridade estrutural e de suma importância sua compreensão e avaliação. Como consequência a este fator, o objetivo deste trabalho é, a partir de uma anterior identificação das propriedades à fratura do material compósito carbono- epóxi, simular numericamente o processo de delaminação através da ferramenta computacional Abaqus. Para tanto, ensaios de delaminação: DCB (double cantilever beam) e ENF (end notched flexure) identificaram as energias críticas de fratura para as interfaces 0/0 e 0/90 em modo I e II. Simulações numéricas foram realizadas, estas embasadas em modelo a dano para interface, que considera a energia de deformação e a força de ativação, à partir da qual inicia-se a trinca. Resultados preliminares mostram a capacidade das simulações numéricas em representar os dados experimentais.

Composite materials became an advantageous option due high specific strength and stiffness; nowadays the applications grow. The unidirectional fiber composite material has complexes damage mechanisms; moreover the delamination process is the most important mechanism considering the structural integrity, being important its understanding and evaluation. As a consequence, the main purpose of this work, using previous fracture properties identification, is to simulate numerically delamination process through the finite element code Abaqus. For that, delamination tests: DCB (double cantilever beam) and ENF (end notched flexure), which identified critical fracture energies for interface 0/0 and 0/90 in mode I and II. Numerical simulations were run, these based on damage interface model that considers deformation energy and activation force for the delamination inception. Preliminary results show the numerical simulations ability to predict the experimental data.

Keywords

Composite materials became an advantageous option due high specific strength and stiffness; nowadays the applications grow. The unidirectional fiber composite material has complexes damage mechanisms; moreover the delamination process is the most importan, being important its understanding and evaluation. As a consequence, the main purpose of this work, using previous fracture properties identification, is to simulate numerically delamination process through the finite element code Abaqus. For that, delamination tests: DCB (double cantilever beam) and ENF (end notched flexure), which identified critical fracture energies for interface 0/0 and 0/90 in mode I and II. Numerical simulations were run, these based on damage interface model that considers deformation energy and activation force for the delamination inception. Preliminary results show the numerical simulations ability to predict the experimental data.

Composite laminate; Delamination; Damage; Numerical simulations.