Crack Propagation of Paper under Fracture Toughness Testing

Atsushi Tanaka, Tatsuo Yamauchi

Research output: Contribution to journalArticleScientificpeer-review


The behavior of the crack tip region under in-plane fracture toughness testing was observed by means of CCD camera with enlarging lens system, and was quantitatively analyzed as "crack opening". From the relationship between "crack opening" and displacement, the start point of the crack propagation can be clearly determined. It varies with specimen direction and size. Smaller specimens tend to start at the maximum load point, while larger specimens start earlier. Generally, the start point of MD specimens are not so far from the maximum load point as in the case of CD specimens. Specimens with smaller ligament length were confirmed to satisfy the prerequisite of "Essential Work of Fracture" method to obtain the fracture toughness of paper.
Original languageEnglish
Pages (from-to)324-332
JournalNihon Hoso Gakkaishi
Issue number6
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed


  • Papers
  • fracture toughness
  • crack propagation
  • CCD camera
  • infrared thermography


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