Monotonic tensile behavior analysis of three-dimensional needle-punched woven C/SiC composites by acoustic emission

Peng Fang, Laifei Cheng, Litong Zhang, Jingjiang Nie

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

High toughness and reliable three-dimensional needled C/SiC composites were fabricated by chemical vapor infiltration (CVI). An approach to analyze the tensile behaviors at room temperature and the damage accumulation of the composites by means of acoustic emission was researched. Also the fracture morphology was examined by S-4700 SEM after tensile tests to prove the damage mechanism. The results indicate that the cumulative energy of acoustic emission (AE) signals can be used to monitor and evaluate the damage evolution in ceramic-matrix composites. The initiation of room-temperature tensile damage in C/SiC composites occurred with the growth of micro-cracks in the matrix at the stress level about 40% of the ultimate fracture stress. The level 70% of the fracture stress could be defined as the critical damage strength.

Original languageEnglish
Pages (from-to)302-306
Number of pages5
JournalJournal of University of Science and Technology Beijing: Mineral Metallurgy Materials (Eng Ed)
Volume15
Issue number3
DOIs
StatePublished - Jun 2008

Keywords

  • acoustic emission
  • C/SiC composites
  • damage
  • damage mechanism
  • tensile behavior

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