Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Study of the CTE mismatch effect in the fracture behaviour of composite materials using lattice models
Submission Author:
Heloisa Zanardi , SP
Co-Authors:
Heloisa Zanardi, Ricardo Afonso Angélico
Presenter: Heloisa Zanardi
doi://10.26678/ABCM.COBEM2019.COB2019-2192
Abstract
The mismatch of thermomechanical properties between the phases of a composite material can lead to cracks nucleation when this material is submitted to a temperature variation. The prediction of mechanical behaviour via numerical modelling becomes difficult because of the complex crack pattern. One of the strategies that can be used in this context is the lattice models. In these models, the structure can be considered as a network of one-dimensional interconnected elements, and the structural failure can be simulated by the progressive damage of the lattice bars. The composite studied was alumina inclusions surrounded by a glass matrix submitted to a cooling. In this study, a single inclusion was considered, referring to the model proposed by Davidge \& Green. The model was applied for two combinations of thermal expansion coefficients. In the first combination, the inclusion thermal expansion is higher than the matrix one; and in the second one, the opposite. The computational tool enables to predict the matrix crack pattern -- circumferential and radial cracks for the first and second case, respectively -- reported in the literature in both models.
Keywords
lattice models, thermomechanical behaviour, properties mismatch, fracture behaviour, Heterogeneous materials
