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No.35 (1988/12) >

Title :破壊した木材の細胞の変形 : 第 3 報 破壊応力以下の圧縮応力で生じる Slip plane(林学科)
Title alternative :Deformation of cell wall in failure wood : III Slip plane occurance associated with stress level (Department of Forestry)
Authors :林, 弘也
大浦, 正嗣
Authors alternative :Hayashi, Hiroya
Ooura, Masashi
Issue Date :5-Dec-1988
Abstract :スギ材をサンプルに圧縮荷重を負荷した試験片に生じたSlip planeを偏光顕微鏡で検出し, 負荷荷重と材の構造との関係を検討して次の結果を得た。1,Slip planeは弾性領域では早材部の仮道管壁に多く発生するが, 塑性領域では晩材部の仮道管壁に多く発生する。2,切線断面の早材部と放射断面の晩材部は弾性領域では放射組織に接する仮道管壁にのみSlip planeを生じ, 塑性領域ではその他の仮道管壁にもSlip planeが認められた。3,Slip planeはいずれの荷重レベルでも放射断面よりも切線断面に多く発生した。4,単壁型のSlip planeは両壁型のSlip planeよりも低い荷重レベルで発生した。5,Slip planeの発生の位置は断面や材部によって同一荷重レベルでも異なる。
A slip plane was a first change of mechanical faiulre in wood with compression stress. The relationship between occurrence of a slip plane and stress would give fundamental informations on the failure process of wood. In this article, it was discusseed the relationship between the type, the position, number of a slip plane and stress. It was used a polarized microscope to detect slip planes of SUGI wood (Cryptomeria japonica) and the obtained results may be summarized as follows. 1. In the elastic range of wood, a compression stress produced slip planes more frequent in early wood than in late wood. In the plastic range, a compression stress produced slip planes more frequent in late wood than in early wood. 2. At early wood in tangential section and late wood in radial section, a slip plane was produced at the tracheid walls contact with a ray in elastic range. But in plastic range, a slip plane was produced at tracheid walls in contact with a ray and out of contact with a ray. 3. A slip plane of late wood tracheid was produced more frequent in tangential section than in radial section. 4. A slip plane of single wall type was produced at lower stress level then a slip plane of double wall type. 5. At same stress level, the location and the number of a slip plane varied with a section and a position in one growth ring.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3896
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.35 p.93 -100
Appears in Collections:No.35 (1988/12)

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