A New Anisotropic Damage Model for Ceramic Matrix Composites

2004 ◽  
Author(s):  
Oana Cazacu ◽  
Stefan Soare
Keyword(s):  
Constitutive Model ◽  
Damage Model ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Irreversible Thermodynamics ◽  
Anisotropic Damage ◽  
Strain Response ◽  
Matrix Composites ◽  
Induced Anisotropy ◽  
Brittle Matrix Composite

Within the framework of irreversible thermodynamics, a new general constitutive model for describing damage and its effect on the overall properties of anisotropic solids is proposed. The ability of the model to describe the overall stress-strain response as well as the loss of symmetry resulting from the interaction between initial and damage-induced anisotropy in a brittle matrix composite is demonstrated.

Accounting for frictional contact in an anisotropic damage model based on compliance tensorial variables, illustration on ceramic matrix composites

2018 ◽  
Vol 28 (8) ◽  
pp. 1150-1169 ◽  
Author(s):  
Emmanuel Baranger
Keyword(s):  
Damage Mechanics ◽  
A Priori ◽  
Damage Model ◽  
Ceramic Matrix Composites ◽  
Inelastic Strain ◽  
Ceramic Matrix ◽  
Thermomechanical Properties ◽  
Matrix Composites ◽  
Crack Network ◽  
Evolution Laws

Ceramic matrix composites have good thermomechanical properties at high or very high temperatures. The modeling of the crack networks associated to the degradation of such composites using damage mechanics is not straightforward. The main reason is the presence of a crack network mainly oriented by the loading direction, which is a priori unknown. To model this, compliance tensorial damage variables are used in a thermodynamic potential able to account for crack closure effects (unilateral contact). The damage kinematic is initially completely free and imposed by the evolution laws. The key point of the present paper is to account for friction in such cracks that can result in an apparent activation/deactivation of the shear damage. The initial model is enriched with an inelastic strain and a friction law. The plasticity criterion is expressed only using tensorial variables. The model is identified and illustrated on multiaxial data obtained at ONERA on tubes loaded in tension and torsion.

Development of a Macroscopic Damage Model for Woven Ceramic Matrix Composites

2010 ◽  
Vol 20 (6) ◽  
pp. 939-957 ◽  
Author(s):  
Lionel Marcin ◽  
Jean-Francois Maire ◽  
Nicolas Carrère ◽  
Eric Martin
Keyword(s):  
Carbon Fiber ◽  
Damage Model ◽  
Nonlinear Behavior ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Torsion Test ◽  
Woven Composites ◽  
Internal Variables ◽  
Matrix Composites ◽  
Predictive Capability

The aim of this article is to propose a macroscopic damage model, which describes the nonlinear behavior observed on woven composites with ceramic matrix. The model is built within a thermodynamic framework with internal variables. First of all, the efficiency of the model to describe the mechanical behavior of carbon fiber-reinforced ceramic matrix composites is outlined. Then, the predictive capability of the model is evaluated with the help of an alternate torsion test.

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