Experimental characterization of high-speed impact damage behavior in a three-dimensionally woven SiC/SiC composite

Keiji Ogi, Tomonaga Okabe, Manabu Takahashi, Shigeki Yashiro, Akinori Yoshimura, Toshio Ogasawara

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

This paper discusses high-speed impact damage in a three-dimensionally woven SiC/SiC composite (3D-CMC). The impact damage was introduced by a steel ball projectile in 3D-CMC plates with and without thermal exposure. The surface and internal damages were observed by optical microscopy and X-ray CT. A crater was observed on the collision surface. The X-ray CT measurement revealed that multiple pyramid-shaped cone cracks were generated beneath the crater when the impact speed was relatively low. At an impact speed exceeding the critical speed, a spall fragment was ejected from the back surface, while no internal damage was observed in the fragment. The spall fracture mode differed between the virgin and the thermally-exposed specimens. This difference is the result of embrittlement of the fiber/matrix interface due to oxidation of the carbon coating layer in the thermally-exposed specimen. In addition, it is found that z-yarns improve impact resistance by constraining delamination.

Original languageEnglish
Pages (from-to)489-498
Number of pages10
JournalComposites Part A: Applied Science and Manufacturing
Volume41
Issue number4
DOIs
Publication statusPublished - Apr 1 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials

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