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The influence of load level on the damages and strength properties of finger-jointed lumber

Research Project

Project/Area Number 24580253
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Wood science
Research InstitutionForestry and Forest Products Research Institute

Principal Investigator

HIRAMATSU YASUSHI  独立行政法人森林総合研究所, 複合材料研究領域, 室長 (80353829)

Co-Investigator(Kenkyū-buntansha) UKYO Seiichiro  独立行政法人森林総合研究所, 構造利用研究領域, 主任研究員 (70455260)
MIYATAKE Atsushi  独立行政法人森林総合研究所, 複合材料研究領域, チーム長 (20353873)
Project Period (FY) 2012-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywordsフィンガージョイント / たて継ぎ / アコースティックエミッション / AE / デジタル画像相関法 / 集成材 / ラミナ / 保証荷重
Outline of Final Research Achievements

In order to investigate the influence of load on the strength properties of finger-jointed (FJ) sugi (Cryptomeria japonica) lumber, monotonic and cyclic tensile loading tests were conducted. In the tests, simultaneous observation of acoustic emission (AE) and two-dimensional strain distribution were conducted. Location of AE was monitored using 1-dimensional source localization technique. AEs were mainly at FJs, and total events of AE increased as the load increased. It was considered that damages were occurred in the FJ and progressed with the increase of load. The tensile strength of monotonic loading tests and cyclic loading tests showed little difference. So, it was considered that the damages of FJ lumber by applying cyclic load had no effect on the tensile strength.

Report

(4 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • 2012 Research-status Report
  • Research Products

    (3 results)

All 2015 Other

All Presentation (3 results)

  • [Presentation] 荷重負荷がフィンガージョイントの損傷および強度に与える影響 (3)同一フィンガージョイント内での引張り強さの違い2015

    • Author(s)
      平松靖、宇京斉一郎、宮武敦、新藤健太、藤本清彦
    • Organizer
      第65回日本木材学会大会
    • Place of Presentation
      タワーホール船堀(東京都)
    • Year and Date
      2015-03-17
    • Related Report
      2014 Annual Research Report
  • [Presentation] 荷重負荷がフィンガージョイントの損傷および強度に与える影響 (1) ひき板の材長方向での密度とヤング係数の分布

    • Author(s)
      平松靖、宇京斉一郎、宮武敦、藤本清彦、新藤健太
    • Organizer
      第63回日本木材学会大会
    • Place of Presentation
      マリオス(盛岡市民文化ホール)
    • Related Report
      2012 Research-status Report
  • [Presentation] 荷重負荷がフィンガージョイントの損傷および強度に与える影響 (2) 単調引張におけるAE発生挙動について

    • Author(s)
      宇京斉一郎、平松靖、宮武敦、藤本清彦、新藤健太
    • Organizer
      第63回日本木材学会大会
    • Place of Presentation
      マリオス(盛岡市民文化ホール)
    • Related Report
      2012 Research-status Report

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Published: 2013-05-31   Modified: 2019-07-29  

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