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3. スラウェシー産材の強度特性
https://doi.org/10.18999/bulnuf.8.94
https://doi.org/10.18999/bulnuf.8.944db6f292-ee0c-4d59-ab1f-cdafbb27746d
| 名前 / ファイル | ライセンス | アクション |
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bulnuf_8_94.pdf (5.5 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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| 公開日 | 2007-08-21 | |||||
| タイトル | ||||||
| タイトル | 3. スラウェシー産材の強度特性 | |||||
| 言語 | ja | |||||
| その他のタイトル | ||||||
| その他のタイトル | 3. Strength Properties of Sulawesi Woods | |||||
| 言語 | en | |||||
| 著者 |
奥山, 剛
× 奥山, 剛× OKUYAMA, Takashi× 伊藤, 孝子× ITOH, Atsuko |
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| アクセス権 | ||||||
| アクセス権 | open access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Strength Properties : In this chapter, the strength properties are summarized. Testing items were tensile tests in parallel and perpendicular to grain, bending, compression parallel to grain and nailwithdrawal tests. \n All of the data were not only listed up but were classified and analyzed experimentally for the purpose of good understanding of the species. The procedure of preparation of testing pieces is as follows. Quarter sawn boards of 3-4.5cm in thickness and over 20 cm in width were cut from diametral direction of the each green log and the flat sawn boards in the same dimension as the quarter sawn board were cut from the boundary between heart wood and sap wood of each green log. \nGreen boards were crosscut into two longitudinal parts. The one of them was prepared for tests in green condition and the other one was dried by mean of low temperature condition. Test specimens of tension parallel to grain, bending and compression test were cut out at regular intervals from pith to bark side of the quarter sawn board to be able to know the distribution of each strength in a log. The remaining parts of the quarter sawn boards were used for the nailwithdrawal test. The tensile test specimens were prepared from the all conditions of the boards of each species. Namely, the tensile test specimens in radial and in 45 degree directions were cut from green and air dried quarter sawn boards. The other ones in tangential and in 45 degree directions were cut from flat sawn boards in green and dried conditions. Longitudinal tensile test specimens were also cut from the green and dried boards. The number of the specimen of each test varies with the species. The round numbers of the specimens are ten for longitudinal tension, ten for bending, six for compression and seven for tension in perpendicular to grain under each condition. For the nailwithdrawal testing, ten nails were used for flatsawn, quartersawn and cross sections respectively. Testing Method : All tests were carried out in conformity with the Japan Industrial Standard. The outline of the testing methods are as follows. Tension parallel to grain; Instron type universal testing machine (Shinko TCM-10000) was used. Load was detected by a load cell and strain was measured by using the wire strain gage (16 mm in gage length). Testing speed was 500 kg/min. Bending; The central loaded simple bending was carried out by the same machine mentioned above. The length of span was 28 cm. The cross section of the specimen was 2 x 2 cm. Load was measured by load cell and the movement of cross head of the machine was used for measuring the deflection. The crosshead speed was selected in 3 mm/min. Compression parallel to grain ; The dimension of the specimen was 2.5 x 2.5 x 7.5 (length) cm. Load and strain were measured by mean of the load cell and the strain gage respectively. Testing speed was about 1000 kg/min. Tension perpendicular to grain ; The dimension of the specimen is shown in Fig. 1. Testing machine was Instron type one (Shinko TCM-500). The load and the strain were measured by load cell and extensometer respectively. Testing speed was 2 mm/min. Nailwithdrawal test ; Testing machine was the electroservo hydraulic testing machine (MTS 810). The attachments shown in Fig. 2 were used for the test. The iron nail (N45) was drived into the specimen until 3 cm in thickness by a hummer and the withdrawal speed was 0.6 mm/min. \nResult : 1. List up of the data : All of the data are listed up in Table 1(a), (b), (c). The numbers in Table1(a) are the data which were given from the clear specimens which didn’t contain the defects, like brittle heart and sloping grain. The bracketed data are the simple mean values of the all data. Table 1(b) shows the nail withdrawl data in respective sections. The numbers represented the estimated values in 1% level of the mean value. Table 1(c) shows the tensile data in perpendicular to grain. The marks T, R and L represent the tangential, radial and longitudinal directions respectively. Subscriptions TL-45 and RL-45 indicate the 45 degree directions to the tangential and radial directions. The numbers written in the upper column of each direction show the data in air dried condition and the lower ones are the data in green condition. 2. Correlation between strength properties and specific gravity. Almost all of the data shows good correlation with specific gravity. Table 2 shows the regression equations in the relation between strength properties and specific gravity. Almost all of the equations excepting the maximum strain show the significance in 1% level. 3. The comparison of the data of Sulawesi woods to the ones from other place of production. Some mechanical properties were compared with the other tropical or domestic woods in Fig 4(a)-(e). 4. Classification of the strength properties. Table 4 shows the classification of some strength properties of the all species. The numbers I-V are based on the criteria predicted in Table 3. The principal criteria were determined in confirmity to the method of Japan Government Forest Experimental Station. 5. Anisotropy of Young’s modulus. The young’s moduli at arbitrary grain angle can be estimated from the equation (1) and the measured young’s moduli E_L, E_T, E_R, E_LT-45 and E_LR-45. The value E_θ/E_L can be drawn on the polar co-ordinate as shown in Fig. 5. The pattern in Fig. 5 shows the example showing the degree of anisotropy of young's modulus. Those were used for the decision of the criteria in the anisotropic degree of the species. Fig. 6 shows the patterns of individual species. In the figure, the pattern shown by broken line is the anisotropy under green condition. 6. Radial distribution of strength properties. Fig 7 shows the distribution of the bending properties from pith to bark, while Fig. 8 shows the one for tensile properties. | |||||
| 言語 | en | |||||
| 内容記述 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 農林水産研究情報センターで作成したPDFファイルを使用している。 | |||||
| 言語 | ja | |||||
| 出版者 | ||||||
| 出版者 | 名古屋大学農学部付属演習林 | |||||
| 言語 | ja | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | departmental bulletin paper | |||||
| 出版タイプ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| ID登録 | ||||||
| ID登録 | 10.18999/bulnuf.8.94 | |||||
| ID登録タイプ | JaLC | |||||
| 関連情報 | ||||||
| 関連タイプ | isVersionOf | |||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://rms1.agsearch.agropedia.affrc.go.jp/contents/JASI/pdf/academy/40-2635.pdf | |||||
| ISSN（print） | ||||||
| 収録物識別子タイプ | PISSN | |||||
| 収録物識別子 | 0469-4708 | |||||
| 書誌情報 |
ja : 名古屋大学農学部演習林報告 巻 8, p. 94-150, 発行日 1984-12 |
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| 値 | application/pdf | |||||
| 著者版フラグ | ||||||
| 値 | publisher | |||||
| URI | ||||||
| 識別子 | http://hdl.handle.net/2237/8683 | |||||
| 識別子タイプ | HDL | |||||
