THE INFLUENCE OF WIDTH, CRACK LENGTH AND STRENGTH-GRADE TO MODE I FRACTURE TOUGHNESS ON CT TESTS

DOI 1 Citations 7 References
  • KAMBE Wataru
    Assistant Prof., Faculty of Eng., Tokyo Univ. of Science, Dr. Eng.
  • IIJIMA Yasuo
    Prof., Institute of Wood Technology, Akita Pref. Univ., Dr. Agr.
  • OKAZAKI Yasuo
    Assoc. Prof., Institute of Wood Technology, Akita Pref. Univ., Dr. Agr.
  • ITAGAKI Naoyuki
    Assoc. Prof., Faculty of Systems & Tech., Akita Pref. Univ., Dr. Eng.

Bibliographic Information

Other Title
  • CT試験における幅，き裂長さ，強度等級がモードI破壊靱性性能に与える影響
  • A discussion about evaluation method of mode I fracture toughness performance with wood for structural glulam Part 2
  • 構造用集成材木材を対象としたモードI破壊靭性性能の評価方法に関する考察　その２

Description

Splitting of wood loaded perpendicular to the grain is a critical issu in timber engineering, and the splitting and failure of wood at its connection are studied in some articles. But to research the characterization and to evaluate that fracture is very difficult. Now we have no standard method to determine the fracture toughness of wood for timber engineering. So we need some simple or useful methods.<br> On the past study, we conducted CT tests with some woods for structural glulam which width is 47mm. However, we didn't under stand the fracture features which size is large, and the fracture toughness. Then we conducted additional CT tests, used its width and crack length as the parameter. Durning the tests, we checked behaviour of crack on the surfaces as the same in the previours study. As result we understood that fracture of wood starts at maximum load or after that, and the fracture feature differs when we differ the size of specimens. In other words, in the case the width is under 94mm and the dimensionless-crack-length in over 0.5, the fracture feature is in ductile and we can obtain J1C in stable. Next we conducted CT tests with different strength-graded wood which width is 47mm. As the results, the J1C doesn't almost differ as the grading it different.

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Details 詳細情報について

  • CRID
    1390001205605884032
  • NII Article ID
    130004507640
  • DOI
    10.3130/aijs.74.1267
  • ISSN
    18818153
    13404202
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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