Strukturne, elastomehanske in akustične lastnosti lesa gorskega javorja (Acer pseudoplatanus L.) z rebrasto teksturo

Jerman, Jan (avtor), Straže, Aleš (mentor), Brus, Robert (komentor)

Rebrasta tekstura v lesu gorskega javorja (Acer pseudoplatanus L.) je znan in dobro opisan pojav, manj raziskan pa je njen vpliv na fizikalne, mehanske in akustične lastnosti ter dimenzijsko stabilnost lesa. V raziskavi smo vzorčili les gorskega javorja z rebrasto teksturo ter les navadnega gorskega javorja. Strukturne lastnosti smo vizualno določali makroskopsko ter s svetlobno mikroskopijo. Na uravnovešenih preizkušancih smo opravili meritve gostote in širine branik ter dimenzijske stabilnosti, nato pa smo preizkušance dinamično mehansko vzbujali vzdolž in prečno na lesna vlakna. Elastomehanske lastnosti v vseh anatomskih smereh lesa smo določili še z ultrazvokom ter izvedli tudi statični upogibni preskus. Na mikroskopski ravni rebraste teksture, primerjalno s premim potekom vlaken, ni bilo mogoče jasno razločiti. Rebrasta tekstura ni izkazala statistično pomembnega vpliva na gostoto in dimenzijsko stabilnost javorjevega lesa. Upogibna trdnost in dinamičen ter statičen upogibni modul elastičnosti obeh tipov lesov so bili primerljivi. Dušenje zvoka lesa navadnega gorskega javorja in javorja z rebrasto teksturo vzdolž in prečno na lesna vlakna je bilo primerljivo.

• Jezik: Slovenski jezik
• Ključne besede: les, javor, rebrasta tekstura, fizikalne lastnosti, mehanske lastnosti, zgradba
• Vrsta gradiva: Diplomsko delo/naloga
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: BF - Biotehniška fakulteta
• Založnik: [J. Jerman]
• Leto izida: 2019
• PID: 20.500.12556/RUL-111220
• UDK: 630*81:630*17(043.2)=163.6
• COBISS.SI-ID: 5498278
• Datum objave v RUL: 26.09.2019

JERMAN, Jan, 2019, Strukturne, elastomehanske in akustične lastnosti lesa gorskega javorja (Acer pseudoplatanus L.) z rebrasto teksturo [na spletu]. Diplomsko delo. J. Jerman. [Dostopano 2 maj 2025]. Pridobljeno s: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=slv&id=111220

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Structural, elastomechanical and acoustic properties of sycamore maple (Acer pseudoplatanus L.) wood with fiddleback figure

Izvleček

Fiddleback figure occurring in sycamore maple (Acer pseudoplatanus L.) wood is a well-known and documented phenomenon, but the same cannot be said about its effects on the physical, mechanical and acoustic properties and the dimensional stability of wood. In the study we sampled sycamore maple wood with present fiddleback figure as well as wood with regular grain. The structural properties were determined macroscopically and by light microscopy. The conditioned specimens were used to determine wood density, growth ring width and dimensional stability. Stifness of wood was determined by dynamic mechanical tests along and perpendicular to the grain and additionally by ultrasound in all anatomic wood directions. Static bending test was performed finally to determine static modulus of elasticity and bending strength. The fiddleback figure of maple on the microscopic level, in comparison with the straight grained wood, could not be clearly distinguished. The fiddleback figure showed no statistically significant effect on the density and dimensional stability of maple wood. The bending strength, dynamic and static moduli of elasticity of the two wood types were comparable. The damping of sound of maple wood with straight grain and maple with fiddleback figure along and transverse to the wood fibers was comparable.

• Ključne besede: wood, maple, fiddleback figure, physical properties, mechanical properties, anatomy