Study of mechanical properties and cracking extension resistance behavior of C/SiC composites by single edge notched beam and digital image correlation techniques

W. G. Mao*, J. Chen, M. S. Si, R. F. Zhang, Z. B. Peng, C. Y. Dai, Q. S. Ma, D. N. Fang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The carbon fiber reinforced silicon carbide matrix (C/SiC) composites were prepared by using precursor infiltration and pyrolysis method. Fracture characteristics of C/SiC materials were studied by single edge notched beam with the aid of digital image correlation (DIC) technique. It was found that DIC played an important role in in-situ monitoring full/local strain evolution and cracking growth during bending tests, which was useful for revealing potential failure micro-mechanisms of C/SiC composites. The results showed that the average fracture toughness KIC and fracture strength of C/SiC were estimated as 7.81±0.12MPam1/2 and 223.23±3.5MPa, respectively. Moreover, the crack extension resistance curves (R-curve) in terms of stress intensity (KR-curves) were determined on the basis of the crack initiation toughness KIC. The values varied from 4.68MPam1/2 to 16.83MPam1/2 during the R-curve tests.

Original languageEnglish
Pages (from-to)222-228
Number of pages7
JournalMaterials Science and Engineering: A
Volume649
DOIs
Publication statusPublished - 1 Jan 2016
Externally publishedYes

Keywords

  • Bending test
  • C/SiC composite
  • Digital image correlation
  • Mechanical properties

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