Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
EFFECT OF IMPERFECT FIBER/MATRIX INTERPHASE: A MICROMECHANICAL MODEL FOR PREDICTING FAILURE IN COMPOSITE MATERIALS
Submission Author:
Maísa Milanez Ávila dias Maciel , SP
Co-Authors:
José Humberto Almeida Júnior, Maísa Milanez Ávila dias Maciel, Volnei Tita
Presenter: Volnei Tita
doi://10.26678/ABCM.COBEM2019.COB2019-0623
Abstract
The macroscopic properties of carbon fiber-reinforced polymer composites (CFRP) depend upon the properties, the interfacial bonding conditions of the constituent phases (fiber and matrix), and the microstructure of the composites. In this research, a numerical methodology to model non-perfect interphase for thin interphase is presented. A transversely isotropic representative volume element (RVE) with circular fibers embedded into a square bulk polymer matrix was developed in order to calculate the effective coefficients of the constitutive tensor for several imperfect contact conditions. The effective coefficients were successfully calculated by using dummy values of shear interphase modulus in order to illustrate the variation of the effective coefficients in case of imperfect interphase. After this step, the material properties and stress-strain curves were predicted for composite materials. In addition, those results can be used as input in a macro-scale model to predict the mechanical response of a composite structure considering imperfect fiber-matrix interphase. The results showed that for a longitudinal loading the interphase does not influence the composites mechanical response, however, it plays a critical role when the shear loading is applied.
Keywords
Fiber-matrix interface, micromechanical modeling, longitudinal failure
