scholarly journals Multiscale ceramic matrix composite thermomechanical damage model with fracture mechanics and internal state variables

2020 ◽  
Vol 236 ◽  
pp. 111847 ◽  
Author(s):  
Travis Skinner ◽  
Ashwin Rai ◽  
Aditi Chattopadhyay
Keyword(s):  
Fracture Mechanics ◽  
Matrix Composite ◽  
Internal State ◽  
Damage Model ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
State Variables ◽  
Internal State Variables ◽  
Thermomechanical Damage

scholarly journals An Advanced Finite Element Modeling for the Failure of Notched Ceramic Matrix Composite With TFP Patch Reinforcement

2021 ◽  
Vol 8 ◽  
Author(s):  
Gang Zhao ◽  
Jianbo Tang ◽  
Jun Wang ◽  
Yunsheng Chen ◽  
Yajie Feng ◽  
...  
Keyword(s):  
Matrix Composite ◽  
Failure Mechanisms ◽  
Damage Model ◽  
Ceramic Matrix Composite ◽  
Mesh Size ◽  
Ceramic Matrix ◽  
Damage And Failure ◽  
Virtual Test ◽  
Modeling Strategy ◽  
Progressive Damage Model

An advanced modeling strategy for notched ceramic matrix composite coupons with patch reinforcement was proposed to investigate the failure mechanisms. This model considered the tailored fiber–placed (TFP) yarn details obtained from the design phase and the embedded element concept which was used to successfully overcome the meshing difficulties. Inter-ply “glue” layers were simulated using the surface-based contact cohesive element method, so the delamination due to interfacial material discontinuity and damage can be well reproduced and analyzed. For composite ply, the energy-based composite progressive damage model that is independent of the mesh size was applied. Virtual test campaign was performed with a variety of geometrical and material parameters, and the damage and failure mechanisms based on the stress analysis can be revealed to support the design optimization of patch reinforcement.

Temperature-Dependent Fracture Mechanics-Informed Damage Model for Ceramic Matrix Composites

2021 ◽  
Author(s):  
Travis Skinner ◽  
Aditi Chattopadhyay
Keyword(s):  
Fracture Mechanics ◽  
Internal State ◽  
Damage Model ◽  
Ceramic Matrix ◽  
Model Parameters ◽  
Internal State Variable ◽  
Temperature Dependent ◽  
State Variable ◽  
Initiation And Propagation ◽  
Matrix Damage

Abstract This work presents a temperature-dependent reformulation of a multiscale fracture mechanics-informed matrix damage model previously developed by the authors. In this paper, internal state variable theory, fracture mechanics, and temperature-dependent material properties and model parameters are implemented to account for length scale-specific ceramic matrix composite (CMC) brittle matrix damage initiation and propagation behavior for temperatures ranging from room temperature (RT) to 1200°C. A unified damage internal state variable (ISV) is introduced to capture effects of matrix porosity, which occurs as a result of material diffusion around grain boundaries, as well as matrix property degradation due to matrix crack initiation and propagation. The porosity contribution to the unified damage ISV is related to the volumetric strain, and matrix cracking effects are captured using fracture mechanics and crack growth kinetics. A combination of temperature-dependent material properties and damage model parameters are included in the model to simulate effects of temperature on the deformation and damage behavior of 2D woven C/SiC CMC material systems. Model calibration is performed using experimental data from literature for plain weave C/SiC CMC at RT, 700°C, and 1200°C to determine how damage model parameters change in this temperature range. The nonlinear, temperature-dependent predictive capabilities of the reformulated model are demonstrated for 1000°C using interpolation to obtain expected damage model parameters at this temperature and the predictions are in good agreement with experimental results at 1000°C.

Nonlinear Dynamic Response of Piezoelectric Plates Considering Damage Effects

2006 ◽  
Vol 324-325 ◽  
pp. 299-302 ◽  
Author(s):  
Yi Ming Fu ◽  
Xian Qiao Wang
Keyword(s):  
Dynamic Response ◽  
Nonlinear Dynamic ◽  
Internal State ◽  
Constitutive Relations ◽  
Damage Model ◽  
State Variables ◽  
Nonlinear Dynamic Response ◽  
Internal State Variables ◽  
Nonlinear Dynamic Equations ◽  
Piezoelectric Plates

Based on the Talreja’s tensor valued internal state variables damage model and the Helmhotlz free energy of piezoelectric material, the constitutive relations of the piezoelectric plates with damage are derived. Then, the nonlinear dynamic equations of the piezoelectric plates considering damage are established. By using the finite difference method and the Newmark scheme, these equations are solved and the effects of damage and electric loads on the nonlinear dynamic response of piezoelectric plates are discussed.

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