Control of multi-scale cracking for improvement of the reliability of carbon/carbon composites via design of interlaminar stress

Shen Qingliang, Yang Guangmeng, Xiao Caixiang, Li Hejun, Song Qiang, Lu Jinhua, M. W. Fu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

Controlled cracking at micro/mesoscale is crucial for decreasing the strength scatter and improving the reliability of carbon/carbon composites (C/Cs). In this work, the controlled cracking is realized by a designed interlaminar residual thermal stress (RTS), which is introduced inside the C/Cs by the alternate stacking of two types of C/C plies with different coefficients of thermal expansion. Firstly, multiscale finite element (FE) modeling is performed to capture the interlaminar RTS induced by the alternate stacking and evaluate the risk of delamination due to the free edge effect. Secondly, mechanisms responsible for the controlled cracking are elaborated with the aid of the FE modeling and experimental characterizations, and the controlled deflections and bifurcations of the crack strongly shield the influence of multiscale flaws. Finally, by adopting this strategy, the flexural strength of the C/Cs increases by 66% while the statistical Weibull modulus also increases from 4.9 to 8.3, verifying the simultaneously improved strength and reliability of the C/Cs.

Original languageEnglish
Article number115985
JournalComposite Structures
Volume297
DOIs
Publication statusPublished - 1 Oct 2022

Keywords

  • Carbon/carbon composites
  • Cracking control
  • Multiscale simulation
  • Reliability enhancement
  • Strength scattering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering

Fingerprint

Dive into the research topics of 'Control of multi-scale cracking for improvement of the reliability of carbon/carbon composites via design of interlaminar stress'. Together they form a unique fingerprint.

Cite this