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Oxidation behaviour and residual mechanical properties of carbon/carbon composites

journal contribution
posted on 2023-09-15, 13:58 authored by Meng Han, Chuwei Zhou, Vadim SilberschmidtVadim Silberschmidt, Qinsheng Bi
Carbon/carbon composites are widely used in re-entry engineering applications thanks to their excellent mechanical properties at high temperatures, but they are easily oxidized in the oxygenated atmosphere. It is important to research their residual mechanical properties influenced by oxidation behaviour, in order to ensure the in-service safety. A microscale degradation model is proposed to predict the oxidation behavior based on the mass conservation and diffusion equations, the derived equivalent steady recession rate of composite is employed to evaluate the residual mechanical properties of the oxidized composite theoretically. A numerical strategy is proposed to investigate the oxidation mechanism of this composite. The differences in the degradation rate between the fiber and the matrix resulted in the steady state and an unchanged shape of the front. Residual mechanical properties of composite with three different domains of oxidation were simulated with a multiscale coupled model. The numerical results demonstrated that the mechanical properties of this composite decreased by 24–32% after oxidation for 30 min at 850 °C. Oxidation also caused the stress redistribution inside components, with the stress concentration diminishing their load-bearing capacity. The local areas of increased stress in the pyrocarbon matrix provided new ways for diffusion of oxygen into the pyrocarbon matrix and fibers. Graphical abstract: [Figure not available: see fulltext.].

Funding

National Natural Science Foundation of China (Grant No.12102152)

State Key Laboratory of Mechanics and Control of Mechanical Structures (Nanjing University of Aeronautics and Astronautics) (Grant No. MCMS-E-0221Y02)

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Carbon Letters

Volume

33

Issue

4

Pages

1241 - 1252

Publisher

Springer

Version

  • AM (Accepted Manuscript)

Rights holder

© The Author(s), under exclusive licence to Korean Carbon Society

Publisher statement

This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/s42823-023-00491-6

Acceptance date

2023-02-28

Publication date

2023-03-20

Copyright date

2023

ISSN

1976-4251

eISSN

2233-4998

Language

  • en

Depositor

Prof Vadim Silberschmidt. Deposit date: 14 September 2023

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