Incremental mean-fields micromechanics scheme for non-linear response of ductile damaged composite materials

Tchalla, A., Azoti, Wiyao, Koutsawa, Y., Makradi, A., Belouettar, S. and Zahrouni, H. (2015) Incremental mean-fields micromechanics scheme for non-linear response of ductile damaged composite materials. Composites Part B: Engineering, 69. 169 - 180. ISSN 1359-8368

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Abstract This work is concerned with the modeling of ductile damage behavior in composite materials by the means of the Incremental Micromechanics Scheme (IMS) as Mean-Fields Homogenization (MFH) technique. Indeed, \{IMS\} is known for its capability to overcome the well-known accuracy restrictions of the Mori–Tanaka (MT) and Self-Consistent (SC) schemes when a high volume fraction of heterogeneities or/and a high contrast between phases properties is reached. This micromechanics formalism is based on the Eshelby’s inclusion concept. The kinematic equation of Dederichs and Zeller (1973) is used as formal solution of the heterogeneous material problem. The nonlinear behavior of the composite is addressed in a general framework based on the kinematic hardening of Lemaıˆtre–Chaboche’s ductile damage model. Thus a classical J 2 plasticity that accounts for the damage evolution within the microstructure is implemented. The time discretization of all rate relations is solved through a generalized mid-point rule that yields to an anisotropic consistent (algorithmic) tangent modulus. To avoid a stiffer macroscopic stress–strain response, an isotropization procedure is adopted during the computation of the Eshelby tensor involved in the \{IMS\} modeling. From a computational aspect, the non linear response of the composite is obtained through two interdependent loops: inner and outer. In the inner loop, the \{IMS\} determines the global strain concentration tensor that is passed to the outer loop. Then, the macroscopic stress–strain response is derived using an iterative algorithm based on the Hill-type incremental formulation. Numerical results are obtained considering several heterogeneous materials such as Metal Matrix Composites (MMCs) as well as Carbon fibers reinforced Epoxy Matrix Composites. The model’s predictions are compared in most of the cases, with experimental data and predictions obtained from MT-based modeling in the open literature.

Item Type: Article
Subjects: Engineering > Mechanical Engineering
Divisions: Faculty of Technology > School of Computer Science
Depositing User: Wiyao Azoti
Date Deposited: 09 Nov 2015 11:36
Last Modified: 02 Jul 2019 09:10

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