期刊
COMPOSITES PART B-ENGINEERING
卷 93, 期 -, 页码 97-114出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2016.02.022
关键词
Polymer-matrix composites (PMCs); Fracture; Interface/interphase; Computational modelling; Finite element analysis (FEA)
资金
- Ministry of Higher Education and Scientific Research of Iraq (MoHESR)
- Deutscher Akademischer Austauschdienst DAAD
- DFG
- Alexander von Humboldt Foundation
- High-End Foreign Expert Program
We predict macroscopic fracture related material parameters of fully exfoliated clay/epoxy nano-composites based on their fine scale features. Fracture is modeled by a phase field approach which is implemented as user subroutines UEL and UMAT in the commercial finite element software Abaqus. The phase field model replaces the sharp discontinuities with a scalar damage field representing the diffuse crack topology through controlling the amount of diffusion by a regularization parameter. Two different constitutive models for the matrix and the clay platelets are used; the nonlinear coupled system consisting of the equilibrium equation and a diffusion-type equation governing the phase field evolution are solved via a Newton-Raphson approach. In order to predict the tensile strength and fracture toughness of the clay/epoxy composites we evaluated the J integral for different specimens with varying cracks. The effect of different geometry and material parameters, such as the clay weight ratio (wt%) and the aspect ratio of clay platelets are studied. (C) 2016 Elsevier Ltd. All rights reserved.
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