
Fizikalna i mehanička svojstva važni su čimbenici pri određivanju prikladnosti i primjene drvnog materijala. Ova je studija usmjerena na istraživanje fi zikalnih i mehaničkih svojstava drva graba (Carpinus betulus L.) dominantnih i potisnutih stabala. Diskovi i uzorci drva izrezani su na prsnoj visini stabla kako bi se odredila fizikalna svojstva (gustoća apsolutno suhog drva, nominalna gustoća drva, uzdužno utezanje, tangencijalno utezanje te radijalno i volumno utezanje) i mehanička svojstva (statičko savijanje, tlačna čvrstoća paralelno s vlakancima, tlačna čvrstoća okomito na vlakanca i tvrdoća). Analiza statističkim T-testom pokazala je da je šumska biomasa dominantnih i potisnutih stabala značajno utjecala na mehanička svojstva drva graba (osim na modul elastičnosti). Međutim, nije zabilježena značajna razlika u fizikalnim svojstvima drva dominantnih i potisnutih stabala. Dobivene vrijednosti MOE i MOR za drvo potisnutih stabala veće su od vrijednosti dobivenih za drvo dominantnih stabala. Prosječne vrijednosti tlačne čvrstoće paralelno s vlakancima, tlačne čvrstoće okomito na vlakanca i tvrdoće grabova drva dominantnih stabala bile su veće u usporedbi s drvom stabala iz potisnutih sastojina. Prema dobivenim vrijednostima mehaničkih svojstava drva može se zaključiti da je drvo graba i dominantnih i potisnutih stabala prosječne kvalitete.
Physical and mechanical properties are important factors in determining the suitability and application of wood material. This study aimed to investigate physical and mechanical properties of hornbeam wood (Carpinus betulus L.) in dominant and suppressed trees. Disks and logs of wood were cut at breast height to examine physical properties (oven- dried density, basic density, longitudinal shrinkage, tangential shrinkage, radial shrinkage, and volumetric shrinkage) and mechanical properties (static bending, compression strength parallel to the grain, compression perpendicular to the grain and hardness). T-test analysis indicated that forest mass (dominant-suppressed trees) affected the mechanical properties significantly (except modulus of elasticity). No significant difference was found between dominant and suppressed trees in terms of physical properties. MOE and MOR are higher in suppressed trees than in dominant trees. The average values of compression strength parallel to the grain, compression strength perpendicular to the grain and hardness of hornbeam wood were higher in the dominant trees than in the suppressed stands. In terms of mechanical properties of hornbeam wood in suppressed and dominant trees, the quality of wood is fair.
grab, mehanička svojstva, dominant trees, suppressed trees, hornbeam, fizikalna svojstva, mechanical properties, potisnuta stabla, physical properties, dominantna stabla
grab, mehanička svojstva, dominant trees, suppressed trees, hornbeam, fizikalna svojstva, mechanical properties, potisnuta stabla, physical properties, dominantna stabla
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