Multiscale Thermomechanical Damage Model with Internal State Variables for Ceramic Matrix Composites

2020 ◽  
Author(s):  
Travis D. Skinner ◽  
Aditi Chattopadhyay
Keyword(s):  
Internal State ◽  
Damage Model ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
State Variables ◽  
Internal State Variables ◽  
Thermomechanical Damage

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.

scholarly journals Prediction of Failure in Ceramic Matrix Composites Using Damage-Based Failure Criterion

2020 ◽  
Vol 4 (4) ◽  
pp. 183
Author(s):  
Neraj Jain ◽  
Dietmar Koch
Keyword(s):  
Failure Criterion ◽  
Damage Mechanics ◽  
Shear Test ◽  
Damage Model ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Filament Winding ◽  
Material Behavior ◽  
Matrix Composites ◽  
Inelastic Behavior

This paper presents a damage-based failure criterion and its implementation in order to predict failure in ceramic matrix composites (CMC) manufactured via filament winding. The material behavior of CMCs is anisotropic and strongly depends on the angle between fiber orientation and loading direction. The inelastic behavior of laminates with different fiber orientations under tension and shear is modeled with the help of continuum damage mechanics. The parameters required for the damage model are obtained from a standard tensile and shear test. An isotropic damage law determines the evolution of damage in thermodynamic space and considers the interaction of damage parameters in different principal material directions. A quadratic damage-based failure criterion inspired by the Tsai-Wu failure criterion is proposed. Failure stress and strain can be predicted with higher accuracy compared to the Tsai-Wu failure criterion in stress- or strain-space. The use of the proposed damage limits allows designing a CMC component based on the microstructural phenomenon of stiffness loss. With the help of results obtained from modeling and experiments, fracture mechanics during the Iosipescu-shear test of CMCs and its capability to determine the shear strength of the material is discussed.

Notch-strength prediction of ceramic matrix composites using multi-scale continuum damage model

Materialia ◽  
2019 ◽  
Vol 6 ◽  
pp. 100267 ◽  
Author(s):  
Rajesh S. Kumar ◽  
Matthew Mordasky ◽  
Greg Ojard ◽  
Zifeng Yuan ◽  
Jacob Fish
Keyword(s):  
Damage Model ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Strength Prediction ◽  
Continuum Damage ◽  
Matrix Composites ◽  
Continuum Damage Model ◽  
Multi Scale ◽  
Notch Strength

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.

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