An Improved Fracture Mechanics-Informed Multiscale Thermomechanical Damage Model for Ceramic Matrix Composites

Travis Skinner, Jacob Schichtel, Aditi Chattopadhyay

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper extends recent work done by the authors in modeling length scale-dependent damage behavior of ceramic matrix composites (CMCs) to include effects of local anisotropy introduced by matrix cracking. This model captures scale-dependent damage initiation and propagation behavior of the brittle matrix by employing internal state variable (ISV) theory within a multiscale modeling framework to obtain damaged matrix stress/strain constitutive relationships at each length scale. The damage ISV captures the effects of matrix cracking and growth by using fracture mechanics and the self-consistent scheme to determine the reduced stiffness of the cracked matrix. Matrix cracks, which activate when stress intensity factors near manufacturing induced cavities exceed the fracture toughness of the material, are assumed to be transversely isotropic in the plane of the crack, and matrix anisotropy occurs when the damaged stiffness tensor is rotated from the crack plane to the global axes. The crack progression and temporal evolution of the damage ISV are governed by fracture mechanics and crack growth kinetics. The model effectively captures first matrix cracking, which is the first significant deviation from linear elasticity. The nonlinear predictive capabilities of the material model are demonstrated for monolithic silicon carbide (SiC) and a 2D woven five-harness satin (5HS) carbon fiber SiC matrix (C/SiC) CMC.

Original languageEnglish (US)
Title of host publicationTMS 2020 149th Annual Meeting and Exhibition Supplemental Proceedings
EditorsZhiwei Peng, Jiann-Yang Hwang, Jerome Downey, Dean Gregurek, Baojun Zhao, Onuralp Yucel, Ender Keskinkilic, Tao Jiang, Jesse White, Morsi Mahmoud
PublisherSpringer
Pages1499-1509
Number of pages11
ISBN (Print)9783030362959
DOIs
StatePublished - Jan 1 2020
Externally publishedYes
Event149th Annual Meeting and Exhibition of the Minerals, Metals and Materials Society, TMS 2020 - San Diego, United States
Duration: Feb 23 2020Feb 27 2020

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

Conference149th Annual Meeting and Exhibition of the Minerals, Metals and Materials Society, TMS 2020
CountryUnited States
CitySan Diego
Period2/23/202/27/20

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Keywords

  • Ceramic matrix composite
  • Damage
  • Fracture mechanics
  • Internal state variable
  • Multiscale

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Skinner, T., Schichtel, J., & Chattopadhyay, A. (2020). An Improved Fracture Mechanics-Informed Multiscale Thermomechanical Damage Model for Ceramic Matrix Composites. In Z. Peng, J-Y. Hwang, J. Downey, D. Gregurek, B. Zhao, O. Yucel, E. Keskinkilic, T. Jiang, J. White, & M. Mahmoud (Eds.), TMS 2020 149th Annual Meeting and Exhibition Supplemental Proceedings (pp. 1499-1509). (Minerals, Metals and Materials Series). Springer. https://doi.org/10.1007/978-3-030-36296-6_139