Initiation and arrest of small cracks of AS4/PEEK in transverse tension

Tsuneyuki Ejlma, Masahisa Koizumi, Naoya Tada, Takayuki Kitamura, Ryuichi Ohtani

Research output: Contribution to journalArticle

Abstract

In order to investigate the fracture process of CFRP with high toughness, a plate specimen of a uni-directionally reinforced AS4/PEEK is subjected to transverse tension at room temperature. The results obtained are summarized as follows; (1) At 83% of fracture stress, small cracks are initiated along the interfaces of fiber and matrix in a group on or near the edge of specimen. (2) The cracks are semi-circular and they are arrested just after the initiation. (3) Although the number of the cracking regions increases as the applied stress increases, the area of each cracking region does not grow due to the crack arrest. (4) The boundary element analysis and the finite element analysis reveal that the arrest is caused by the cylindrical shape of the interface. (5) The cracks restart to grow and make coalescence when the stress field near the crack tip satisfies the condition of crack kinking. (6) The main crack formed brings about the specimen breaks down when the stress intensity factor reaches the macroscopic toughness, which is evaluated by DCB specimen.

Original languageEnglish
Pages (from-to)1022-1028
Number of pages7
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume48
Issue number9
DOIs
Publication statusPublished - Sep 1999
Externally publishedYes

ASJC Scopus subject areas

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

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