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

Conference · · AIAA Scitech 2020 Forum
DOI:https://doi.org/10.2514/6.2020-1382· OSTI ID:2395950
 [1];  [2]
  1. Arizona State University; Arizona State University
  2. Arizona State University
A length scale-dependent matrix damage model has been developed to simulate the response of ceramic matrix composites (CMCs). This model captures damage initiation and propagation in the brittle matrix material by employing internal state variable (ISV) theory within a multiscale modeling framework to obtain damaged matrix stress-strain constitutive relationships at each length scale. Material degradation due to matrix cracking is captured by a damage variable determined using fracture mechanics and the self-consistent scheme. An additional state variable is introduced to capture the nucleation and growth of matrix porosity, a key mechanism contributing to matrix nonlinearity. Porosity occurs as a result of material diffusion around grain boundaries and the growth of the porosity state variable is related to the material entropy dissipation and the volumetric strain. The nonlinear predictive capabilities of the material model are demonstrated for monolithic silicon carbide, unidirectional (UD) carbon fiber/silicon carbide matrix (C/SiC) CMC, and five-harness satin (5HS) woven C/SiC CMC.
Research Organization:
Arizona State University
Sponsoring Organization:
USDOE
DOE Contract Number:
FE0031759
OSTI ID:
2395950
Report Number(s):
DOE-0031759
Conference Information:
Journal Name: AIAA Scitech 2020 Forum
Country of Publication:
United States
Language:
English

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