WEKO3
アイテム
木材の乾燥応力について(林学部門)
https://kpu.repo.nii.ac.jp/records/4729
https://kpu.repo.nii.ac.jp/records/472969d82362-01f4-46e2-9594-e082a66a5e5d
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
KJ00000078728.pdf (636.4 kB)
|
|
| Item type | [ELS]紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2017-02-20 | |||||
| タイトル | ||||||
| タイトル | 木材の乾燥応力について(林学部門) | |||||
| 言語 | ja | |||||
| その他（別言語等） | ||||||
| その他のタイトル | On the drying stresses in wood (Forestry) | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 資源タイプ | ||||||
| 資源タイプ | departmental bulletin paper | |||||
| 著者 |
福山, 万治郎
× 福山, 万治郎 |
|||||
| 抄録(日) | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 本実験は, 本邦産のヒノキおよびブナ材を用いて乾燥ひずみの変移や大きさをslice methodで測定し, あわせて乾燥応力と木材の物理的, 機械的諸性質との関連性を検討したもので, 主な結果は次のとおりである。1)最大引張ひずみと最大圧縮ひずみはほぼ同じ時期にあらわれ, それぞれの大きさは樹種や乾燥条件に関係なくほぼ等しい(Fig. 4,Table 3)。2) setの大きさや変移はFig. 6,Table 5のとおりで, tension setはcompression setよりも, またブナ材のsetはヒノキ材のそれよりも大きい。3)最大乾燥応力と静的強度(木材繊維直角方向)との関係はTable 6のとおりで, 表面層の引張応力は横引張0.5%一応力にほぼ等しいが, 中心層の圧縮応力は横圧縮比例限応力よりも著しく小さいので, set発生の可能性が考えられない。したがつてsetの推定法についてはさらに検討されねばならない。4)木材表面の局部的乾燥, 横引張比例限応力および弾性係数から考察すると, 表面層の最大引張ひずみの発生は表面層のsetないしは塑性の完了状態に対応すると考えられる。 | |||||
| 言語 | ja | |||||
| 抄録(英) | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | This paper deals with the investigations on the general paterns of drying strain developed in wood by means of slicing technique and the relations of drying stresses to physical and mechanical properties of wood. The specimens of Hinoki (Chamaecyparis obtusa) and Buna (Fagus crenata) were used (Fig. 1), and moisture contents of the specimens were 80∿85% and 70∿77% respectively. The investigations were conducted on two kinds of relative humidities (A : determing from equation (1) and Table 1,B : 60% constant) under the temperature of 60℃. The results obtained are as follows : 1) The figures showing the variations of drying strain with drying process were approximately same for the all conditions, and the maximum compression strain is occured at the observed time of the maximum tension strain. The magnitudes of the maximum drying strain in outside and interior slices respectively, were approximately constant in spite of the difference of species and drying conditions. 2) The magnitude of tension set was somewhat greater than that of compression, and the values of Buna were greater than Hinoki (Table 5). 3) The relations between the maximum drying stresses and the static strength (perpendicular to grain) are shown in Table 6. It is supposed that the compression set does not occure in interior slices, as the maximum compression stress in interior slices is considerably smaller ihan the stress at proportional limit in compression. 4) Considering the partial drying of surface layer, modulus of elasticity and stress at proportional limit in tension of wood, it may be postulated that the occurrence of the maximum tension strain in outside slices is probably corresponding to the completion of plasticity in surface of dried-wood. | |||||
| 言語 | en | |||||
| 書誌情報 |
京都府立大學學術報告. 農學 en : The scientific reports of Kyoto Prefectural University. Agriculture 巻 14, p. 92-98, 発行日 1962-09-01 |
|||||
| 雑誌書誌ID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00062275 | |||||
| ISSN | ||||||
| 収録物識別子タイプ | PISSN | |||||
| 収録物識別子 | 00757373 | |||||
