broj: 9-10/1960        pdf (11,5 MB)



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Znanstveno-stručno i staleško glasilo
Hrvatskoga šumarskoga društva
Journal of Forestry Society of Croatia
      Prvi puta izašao 1877. godine i neprekidno izlazi do današnjeg dana
   ISSN No.: 0373-1332              UDC 630* https://doi.org/10.31298/sl
upute autorima
WEB EDITION
ARHIVA ČASOPISA


HRČAK


Horvat Ivo
Physical and mechanical properties of Common Alder-wood (Alnus glutinosa Gaertn.).     PDF     EN 273
Summary: Described are the results of investigation into the some physical and mechanical properties of Common Alder-wood. There were investigated 10 sample trees of Common Alder-wood (Alnus glutinosa Gaertn.) from the forest district Lipovljani.
Then aim of this investigation was to examine some physical and mechanical properties of Common Alder-wood from the forest district Lipovljani.
From the sample trees were prepared 10 sample section (bolts). These section were taken at breast night of the sample trees. The length of these section was 1.0 m. From these sample sections were made and examined 1022 specimens. Measured and investigated were the following physical and mechanical properties of Common Alder-wood: annual-ring width, specific gravity in air-dry state, nominal specific gravity; radial, tangential and volume shrinkage; static bending strength, impact bending strength, compressive strength, modulus of elasticity, hardness by Janka and Brinell method, and the moisture content of specimens.
On the basis of these investigations it is possible to draw the following conclusions:
1. Specific gravity of Common Alder-wood from Lipovljani (0.539 g/cm3, 0.509 g/cm3, 0.444 g/cm3) is small. Specific gravity of Common Alder-wood (0.51 g/cm3) is slighter greater than that of Silver and Black Poplar-wood (0.41 g/cm3) from Lipovljani.
2. Linear and volume shrinkage of Common Alder-wood from Lipovljani (3.8, 8.2, 12.6 %) is moderate. Linear and volume shrinkage of Common Alder-wood is slighter smaller than that of Silver Poplar-wood (4.4, 8.5, 13.7 %) and Black Poplar-wood (4.7, 8.8, 14.4 %) from Lipovljani.
3. Common Alder-wood from Lipovljani is low static bending strength (411 kg/cm2), moderate impact bending strength (0.60 mkg/cm2) and compression strength (497 kg/cm2), moderate elasticity (95.000 kg/cm2) and moderate hardness (442 kg/cm2). Common Alder-wood from Lipovljani is slightly stronger more elastic and harder than the Silver Poplar-wood (324 kg/cm2, 0.49 mkg/cm2, 422 kg/cm2, 88.000 kg/cm2, 280 kg/cm2) and Black Poplar-wood (317 kg/cm2, 0.45 mkg/cm2, 409 kg/cm2, 82.000 kg/cm2, 312 kg/cm2) from Lipovljani.
4. Generally, it can be said that the Common Alder-wood is of small density, moderate shrinkage, moderate impact bending and compression strength, moderate elasticity, low static bending strength and moderate hardness.

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