Modeling creep behavior in ceramic matrix composites

Khafagy, Khaled H.; Sorini, Christopher; Skinner, Travis; Chattopadhyay, Aditi

doi:10.1016/j.ceramint.2021.01.125

Cited by 11 publications

(5 citation statements)

References 37 publications

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“…A 3D orthotropic viscoplasticity creep model was utilized to model different stages of creep, creep strain evolution, CMR, and constituent stress transfer in CMCs. 22 The methodology uses Hill’s orthotropic plastic potential, 29 an associative flow rule, and the Norton-Bailey creep power law 30,31 with Arrhenius temperature dependence. 32 The effective inelastic (creep) strain can be expressed aswhere A, n>1, m<1, and P=Qk are non-negative model parameters.…”

Section: Methodsmentioning

confidence: 99%

“…Perfect bonding between the fibers and matrix is also assumed. The creep parameters of the constituents are calibrated in previous work 22 and listed in Table 2.…”

Section: Creep Loading Conditionsmentioning

confidence: 99%

“…Moreover, Khafagy et al 22 have recently developed a 3D orthotropic viscoplasticity formulation with progressive damage to investigate the complex time- and temperature-dependent constituent load transfer and damage behavior in CMCs subjected to creep. 22 The formulation is based on Hill’s orthotropic plastic potential, an associative flow rule, and the Norton-Bailey creep power law with Arrhenius temperature dependence. The methodology was used to describe different stages of creep until failure, damage evolution, reductions in the fiber and matrix moduli due to damage and defect nucleation and growth, creep strain evolution, constituent stress transfer, and composite failure.…”

Section: Introductionmentioning

confidence: 99%

“…Xin Jing et al, 19 Halverson and Curtin, 20 and Baxevanis and Charalambakis 21 simulated creep behavior and incorporated a damage evolution model with the creep model to capture the tertiary creep stage and composite fracture. Moreover, Khafagy et al 22 have recently developed a 3D orthotropic viscoplasticity formulation with progressive damage to investigate the complex time- and temperature-dependent constituent load transfer and damage behavior in CMCs subjected to creep. 22 The formulation is based on Hill’s orthotropic plastic potential, an associative flow rule, and the Norton-Bailey creep power law with Arrhenius temperature dependence.…”

Section: Introductionmentioning

confidence: 99%

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High-fidelity micromechanical modeling of the effects of defects on damage and creep behavior in single tow ceramic matrix composite

Khafagy

Chattopadhyay

2022

Journal of Composite Materials

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Despite the superior properties of ceramic matrix composites (CMCs), their fabrication process generates inevitable defects with high density that significantly influence material integrity and residual useful life. Recent efforts have focused on CMC property prediction and investigation of their different inelastic mechanisms, but very limited work exists on understanding the influence of defects on inelastic responses of CMCs. Here, we introduce a three-dimensional micromechanics computational framework that includes experimentally informed material microstructure and architectural variabilities to investigate CMC response in the presence of manufacturing-induced defects. A developed microstructure generation algorithm is used to generate the representative volume elements in the micromechanics models from complex material morphology information obtained from extensive characterization studies of C/SiNC and SiC/SiNC CMCs. A fracture mechanics-informed matrix damage model is reformulated, in which the model considers the growth of porosity and microcracks in the as-received material. A progressive fiber damage model as well as Orthotropic viscoplasticity creep formulation are also utilized for the study. This methodology is implemented within the micromechanics framework to investigate the complex temperature- and time-dependent load transfer and damage mechanisms of CMCs under operation loading conditions. The developed framework explores the influence of as-received defects on the damage and creep behavior in service conditions. It also provides new insights into the effect of size, shape, distribution, and location of these defects on material response. The framework is then calibrated with unidirectional CMC minicomposite results available in the literature.

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Section: Methodsmentioning

confidence: 99%

“…Perfect bonding between the fibers and matrix is also assumed. The creep parameters of the constituents are calibrated in previous work 22 and listed in Table 2.…”

Section: Creep Loading Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High-fidelity micromechanical modeling of the effects of defects on damage and creep behavior in single tow ceramic matrix composite

Khafagy

Chattopadhyay

2022

Journal of Composite Materials

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“…In addition, the composite structures usually serve in a mixed-mode loading or coupling environment that induces more complex failure behavior, such as crack propagation under fatigue loading and crack healing under an oxidation environment. Lots of effort has been contributed to illustrate the results of an extensive experimental investigation on the static and fatigue crack propagation, creep behavior, oxidation, and corrosion of composite materials over the past decades [34][35][36][37].…”

Section: Failure Mechanism Of Ceramic Matrix Compositesmentioning

confidence: 99%

A Review on Ceramic Matrix Composites and Environmental Barrier Coatings for Aero-Engine: Material Development and Failure Analysis

2023

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Ceramic matrix composites with environmental barrier coatings (CMC/EBCs) are the most promising material solution for hot section components of aero-engines. It is necessary to access relevant information and knowledge of the physical properties of various CMC and EBCs, the characteristics of defects and damages, and relevant failure mechanisms. Then, effective failure prediction models can be established. Individually assessing the failure of CMC and EBCs is not a simple task. Models considering the synergetic effect of coating properties and substrate fibrous architecture are more reasonable and more challenging. This paper offers a review and a detailed description of the materials features, failure mechanism, and failure modeling for both CMC substrate and EBC coatings. The various methods for failure analyses and their pros and cons are discussed. General remarks on technical development for failure modeling are summarized subsequently.

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Mechanics of Materials at High Temperature

2024

Comprehensive Mechanics of Materials

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Modeling creep behavior in ceramic matrix composites

Cited by 11 publications

References 37 publications

High-fidelity micromechanical modeling of the effects of defects on damage and creep behavior in single tow ceramic matrix composite

High-fidelity micromechanical modeling of the effects of defects on damage and creep behavior in single tow ceramic matrix composite

A Review on Ceramic Matrix Composites and Environmental Barrier Coatings for Aero-Engine: Material Development and Failure Analysis

Mechanics of Materials at High Temperature

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