Measurement of Crack Tip Opening Displacement of Paper: Effects of Specimen Geometry and Initial Crack Length

Kazuyoshi Takagi, Atsushi Tanaka, Tatsuo Yamauchi

Research output: Contribution to journalArticleScientificpeer-review


Crack opening displacement (COD) on double edge notched (DEN), single edge notched (SEN) and center notched (SCN) specimens with various crack length was quantitatively analyzed by using video-microscopy for a machine-grazed paper. A linear relationship appears between COD and the distance from the crack tip throughout the testing period for all specimens. The COD-clamp displacement relationship seems to consist of three linear segments and the transitional point between the second and the third segment is identified as the onset of crack propagation for all specimens. Thus, CTOD at the onset of crack propagation (CTODc) can be determined despite of specimen geometry and crack length. Specimen geometry a little affects CTODc for the paper tested.
Original languageEnglish
Pages (from-to)179-184
Number of pages6
JournalNihon Hoso Gakkaishi
Issue number3
Publication statusPublished - 2000
MoE publication typeNot Eligible



  • Papers
  • Fracture toughness testing
  • Crack tip opening displacement
  • Specimen geometry

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