Initiation strength properties of ring crack caused by sphere indentation in damage-tolerant Advanced Pore-Free SiC

Shinya Matsuda, Manabu Takahashi, Masafumi Matsushita, Nagatoshi Okabe, Hiroaki Ohfuji

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Sphere indentation tests were performed to clarify damage properties on surface of Advanced Pore-Free SiC (APF-SiC) with excellent damage tolerance. The ring crack initiation strength properties were discussed from fracture mechanics viewpoint based on FEM analysis and detailed observations of growth behaviors of the ring crack and the cone crack. As compared to conventional SiC, the initiation strength was nearly equal to regardless of sphere sizes. However, its scatter was increased with increasing sphere sizes. Clusters are formed by uniting some in multi-micro cracks which occur near surface with increasing the contact load, one of that from which the ring crack occurs. Therefore, the strength and the scatter are controlled by the cluster size and its distribution, and the size depends on the generating crack density. It can be explained by the mechanics model which is expressed by the relationship between strength ratio and crack density based on the energy equilibrium theory.

Original languageEnglish
Pages (from-to)1138-1145
Number of pages8
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume57
Issue number11
DOIs
Publication statusPublished - 2008 Nov
Externally publishedYes

Keywords

  • Advanced Pore-Free SiC
  • Cluster
  • Crack density
  • Damage tolerance
  • King crack
  • Mechanics model
  • Sphere indentation
  • Stress intensity factor

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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