Modeling the two-way coupling of stress, diffusion, and oxidation in heterogeneous CMC microstructures

Schichtel, Jacob; Chattopadhyay, Aditi

doi:10.1016/j.jeurceramsoc.2022.09.046

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…Stress-related diffusion problems appear in the description of metal oxidation processes under operating conditions [14][15][16][17] and hydrogen embrittlement processes [18][19][20][21]. Each of the directions deserves a separate review.…”

Section: Introductionmentioning

confidence: 99%

The influence of vacancy generation on the impurity distribution in the target under the conditions of surface treatment by a particle beam

Parfenova

Knyazeva

2023

Z Angew Math Mech

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The paper presents a nonlinear coupled isothermal model of the process of surface treatment by a particle beam. The model takes into account the interaction between the diffusion of impurity and propagation of mechanical disturbances, as well as the transfer of the introduced impurity with the vacancy mechanism and under the action of stresses. The nonlinear problem is solved numerically using an implicit symmetric difference scheme of the second order approximation in time and spatial coordinates. The finite time of mass flux relaxation and the dependence of diffusion coefficient on the composition and on the concentration of vacancies lead to peculiarities in the propagation of both the concentration wave and the wave of mechanical disturbances. Vacancy generation contributes to the acceleration of impurity propagation and increased strain/stresses.

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Section: Introductionmentioning

confidence: 99%

The influence of vacancy generation on the impurity distribution in the target under the conditions of surface treatment by a particle beam

Parfenova

Knyazeva

2023

Z Angew Math Mech

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“…However, engineering applications of PIP-manufactured CMCs (PIP-CMCs) are currently restricted owing to the large defects (such as microcracks and voids) and significant structural deformation induced by the processes [6]. Process-induced microcracks and voids can easily become initiation sites for fracture [7,8] and trigger interconnected channels for corrosive media penetration [9][10][11][12]. Process deformation may result in significant deviations in the structural size and shape and subsequent difficulty in assembling parts [13].…”

Section: Introduction mentioning

confidence: 99%

Modeling of the process-induced stress, damage, microstructure, and deformation evolution during the pyrolysis process manufacturing CMCs

Liu,

Ma,

Yuan

et al. 2023

Journal of Advanced Ceramics

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An insightful understanding of the formation mechanism of process-inherent defects and deformation is increasingly important for the property evaluation and structural design of ceramic matrix composites (CMCs). For this purpose, a coupled thermal-diffusive-mechanical modeling approach was proposed by considering three important phenomena that occur during the pyrolysis process for manufacturing CMCs: variations of the physical and mechanical properties of the constituents, generation and diffusive of pyrolysis gas, and multiple thermal deformations. The synergistic effects of these three phenomena on the stress, damage development, microstructural morphology, and process deformation of SiC matrix composites were investigated using finiteelement simulations. This new approach was validated by comparing the simulation and experimental results. Significant volume shrinkage of the matrix during the polymer-to-ceramic transformation resulted in large tensile stresses and subsequent highly fragmented microstructure in CMCs. The pyrolysis-gas-induced expansion on the matrix under a damage state may yield a positive process deformation of CMCs at the macroscale, overcoming the effects of the volume shrinkage of the bulk matrix at the microscale. The modeling approach is expected to guide high-quality manufacturing of CMCs and comprehensive studies of structure-processing-property relationships.

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Multi deep learning-based stochastic microstructure reconstruction and high-fidelity micromechanics simulation of time-dependent ceramic matrix composite response

Hamza,

Chattopadhyay

2024

Composite Structures

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Modeling the two-way coupling of stress, diffusion, and oxidation in heterogeneous CMC microstructures

Cited by 5 publications

References 29 publications

The influence of vacancy generation on the impurity distribution in the target under the conditions of surface treatment by a particle beam

The influence of vacancy generation on the impurity distribution in the target under the conditions of surface treatment by a particle beam

Modeling of the process-induced stress, damage, microstructure, and deformation evolution during the pyrolysis process manufacturing CMCs

Multi deep learning-based stochastic microstructure reconstruction and high-fidelity micromechanics simulation of time-dependent ceramic matrix composite response

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