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Title: Microstructural and infiltration properties of woven preforms during chemical vapor infiltration

Abstract

Abstract Interface‐resolved direct numerical simulations (DNSs) of chemical vapor infiltration (CVI) have been performed over a range of furnace‐operating conditions (Thiele moduli) and for practical woven preform geometries. A level‐set method is used to resolve the geometry of the initial preform at tow scale. The interface between the vapor and solid phase is then evolved in time through the entire CVI densification cycle, fully resolving the time‐varying topology between the two phases. In contrast to previous level‐set methods for CVI simulation, the physical reaction and diffusion processes govern the level‐set movement in the current approach. The surface deposition kinetics is described by the usual one‐step model. In this paper, the DNS data are used to study the evolving porosity, surface‐to‐volume ratio, and flow infiltration properties (permeability and effective diffusivities). Comparisons are made to popularly‐assumed structure functions and the standard, Kozeny–Carmen porous media model commonly employed in modeled CFD simulations of CVI. The virtual DNS experiments reveal a Thiele modulus and preform geometry (fabric layup) dependence which the existing microstructural and infiltration models are not able to describe throughout the entire densification process. The DNS‐based, woven geometry‐specific correlations can be applied directly to mean‐field, furnace‐scale CFD simulations.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [3]
  1. Rolls-Royce Corporation, Indianapolis, IN (United States). Composites Technology Center
  2. Rolls-Royce Corporation, Indianapolis, IN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
OSTI Identifier:
1865758
Alternate Identifier(s):
OSTI ID: 1860942
Grant/Contract Number:  
AC05-00OR22725; DE‐AC0500OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 105; Journal Issue: 7; Journal ID: ISSN 0002-7820
Publisher:
American Ceramic Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ceramic matrix composites; chemical vapor infiltration; direct numberical simulations; high performance computing; level-set methods; manufacturing; modeling/model; silicon carbide

Citation Formats

Cha, Chong M., Liliedahl, David, Sankaran, Ramanan, and Ramanuj, Vimal. Microstructural and infiltration properties of woven preforms during chemical vapor infiltration. United States: N. p., 2021. Web. doi:10.1111/jace.18203.
Cha, Chong M., Liliedahl, David, Sankaran, Ramanan, & Ramanuj, Vimal. Microstructural and infiltration properties of woven preforms during chemical vapor infiltration. United States. https://doi.org/10.1111/jace.18203
Cha, Chong M., Liliedahl, David, Sankaran, Ramanan, and Ramanuj, Vimal. Tue . "Microstructural and infiltration properties of woven preforms during chemical vapor infiltration". United States. https://doi.org/10.1111/jace.18203. https://www.osti.gov/servlets/purl/1865758.
@article{osti_1865758,
title = {Microstructural and infiltration properties of woven preforms during chemical vapor infiltration},
author = {Cha, Chong M. and Liliedahl, David and Sankaran, Ramanan and Ramanuj, Vimal},
abstractNote = {Abstract Interface‐resolved direct numerical simulations (DNSs) of chemical vapor infiltration (CVI) have been performed over a range of furnace‐operating conditions (Thiele moduli) and for practical woven preform geometries. A level‐set method is used to resolve the geometry of the initial preform at tow scale. The interface between the vapor and solid phase is then evolved in time through the entire CVI densification cycle, fully resolving the time‐varying topology between the two phases. In contrast to previous level‐set methods for CVI simulation, the physical reaction and diffusion processes govern the level‐set movement in the current approach. The surface deposition kinetics is described by the usual one‐step model. In this paper, the DNS data are used to study the evolving porosity, surface‐to‐volume ratio, and flow infiltration properties (permeability and effective diffusivities). Comparisons are made to popularly‐assumed structure functions and the standard, Kozeny–Carmen porous media model commonly employed in modeled CFD simulations of CVI. The virtual DNS experiments reveal a Thiele modulus and preform geometry (fabric layup) dependence which the existing microstructural and infiltration models are not able to describe throughout the entire densification process. The DNS‐based, woven geometry‐specific correlations can be applied directly to mean‐field, furnace‐scale CFD simulations.},
doi = {10.1111/jace.18203},
journal = {Journal of the American Ceramic Society},
number = 7,
volume = 105,
place = {United States},
year = {2021},
month = {11}
}

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