Mechanical parameters of thermally modified ash wood determined by compression in radial direction

Mechanical parameters of ash wood (Fraxinus excelsior) subjected to compression in radial direction, before and after its thermal modification and measured at moisture content close to the equilibrium moisture content of wood exposed in and outside (4 and 12%) were compared. Thermal modification of wood was performed at 190°C or 200°C for 2 h in industrial conditions. During the measurements, the moisture content of the modified and control samples was identical. The parameters compared included: modulus of elasticity, stress at proportionality limit, relative linear strain at proportionality limit and accumulated elastic energy. Changes in the mechanical parameters of wood induced by its thermal modification were found to depend on the modification temperature and wood moisture content

Mechanical parameters of thermally modified ash wood determined on compression in tangential direction

        G M T   Detectar idioma Afrikáans Albanés Alemán Árabe Armenio Azerí Bengalí Bielorruso Birmano Bosnio Búlgaro Canarés Catalán Cebuano Checo Chichewa Chino (Simp) Chino (Trad) Cincalés Coreano Criollo haitiano Croata Danés Eslovaco Esloveno Español Esperanto Estonio Euskera Finlandés Francés Galés Gallego Georgiano Griego Gujarati Hausa Hebreo Hindi Hmong Holandés Húngaro Igbo Indonesio Inglés Irlandés Islandés Italiano Japonés Javanés Jemer Kazajo Lao Latín Letón Lituano Macedonio Malayalam Malayo Malgache Maltés Maorí Maratí Mongol Nepalí Noruego Persa Polaco Portugués Punjabí Rumano Ruso Serbio Sesoto Somalí Suajili Sueco Sundanés Tagalo Tailandés Tamil Tayiko Telugu Turco Ucraniano Urdu Uzbeco Vietnamita Yidis Yoruba Zulú   Afrikáans Albanés Alemán Árabe Armenio Azerí Bengalí Bielorruso Birmano Bosnio Búlgaro Canarés Catalán Cebuano Checo Chichewa Chino (Simp) Chino (Trad) Cincalés Coreano Criollo haitiano Croata Danés Eslovaco Esloveno Español Esperanto Estonio Euskera Finlandés Francés Galés Gallego Georgiano Griego Gujarati Hausa Hebreo Hindi Hmong Holandés Húngaro Igbo Indonesio Inglés Irlandés Islandés Italiano Japonés Javanés Jemer Kazajo Lao Latín Letón Lituano Macedonio Malayalam Malayo Malgache Maltés Maorí Maratí Mongol Nepalí Noruego Persa Polaco Portugués Punjabí Rumano Ruso Serbio Sesoto Somalí Suajili Sueco Sundanés Tagalo Tailandés Tamil Tayiko Telugu Turco Ucraniano Urdu Uzbeco Vietnamita Yidis Yoruba Zulú                 La función de sonido está limitada a 200 caracteres     Opciones : Historia : Feedback : Donate CerrarMechanical parameters of ash wood (Fraxinus excelsior) subjected to compression in tangential direction, before and after its thermal modification and measured at the moisture content close to the equilibrium moisture content of wood used inside and outside the house,  (4 and 12%) were compared. Thermal modification of wood was performed at 190°C and 200°C for 2 hours in industrial conditions. During the measurements, the moisture content of the modified and control samples was the same. The parameters compared included: modulus of elasticity, stress at proportionality limit, relative linear strain at proportionality limit and accumulated elastic energy. Thermal modification of ash wood at 190°C contributed to the deterioration of its mechanical parameters determined during compression in tangential direction; the deterioration was greater for wood tissue of higher moisture content. The values of mechanical parameters of thermally modified wood (except for elastic energy), determined in compression test in tangential direction, decrease with the its increasing moisture more than for the control wood

Varijacije mehaničkih svojstava unutar pojedinih godova rezonantne smrekovine

This paper shows results of specific elastic modulus and specific tensile strength in the resonance spruce wood [Picea abies (L.) Karst.] in relation to its heterogeneity within individual annual rings. It also presents changes in the average values of microfibril angle in S2 layer measured in tangential walls of tracheids (MFA) within individual annual rings. On the grounds of the results, it can be concluded that specific modulus of elasticity and specific tensile strength of wood are strongly influenced by the position of the sample in annual rings. Generally, the values of these parameters increase along the width of annual rings. It is also noted that the specific modulus of elasticity and specific tensile strength depend on MFA. As MFA decreases, the values of these parameters increase.U radu se prikazuju rezultati istraživanja specifičnog modula elastičnosti i specifične vlačne čvrstoće rezonantnog drva smreke [Picea abies (L.) Karst.] s obzirom na njihovu heterogenost unutar pojedinih godova. Također su prikazane i promjene prosječnih vrijednosti kuta mikrofibrila u sloju S2 izmjerene u tangencijskim stijenkama traheida (MFA) unutar pojedinih godova. Na temelju dobivenih rezultata može se zaključiti da položaj uzorka u godovima ima velik utjecaj na specifični modul elastičnosti i na specifičnu vlačnu čvrstoću drva. Općenito, vrijednosti tih parametara povećavaju se uzduž širine godova. Također je zabilježeno da specifični modul elastičnosti i specifična vlačna čvrstoća ovise o MFA. Kako se MFA smanjuje, vrijednosti tih parametara se povećavaju

Mechanical parameters of thermally modified ash wood determined by compression in radial direction

Mechanical parameters of ash wood (Fraxinus excelsior) subjected to compression in radial direction, before and after its thermal modification and measured at moisture content close to the equilibrium moisture content of wood exposed in and outside (4 and 12%) were compared. Thermal modification of wood was performed at 190°C or 200°C for 2 h in industrial conditions. During the measurements, the moisture content of the modified and control samples was identical. The parameters compared included: modulus of elasticity, stress at proportionality limit, relative linear strain at proportionality limit and accumulated elastic energy. Changes in the mechanical parameters of wood induced by its thermal modification were found to depend on the modification temperature and wood moisture content

Mechanical parameters of thermally modified ash wood determined on compression in tangential direction

Mechanical parameters of ash wood (Fraxinus excelsior) subjected to compression in tangential direction, before and after its thermal modification and measured at the moisture content close to the equilibrium moisture content of wood used inside and outside the house,  (4 and 12%) were compared. Thermal modification of wood was performed at 190°C and 200°C for 2 hours in industrial conditions. During the measurements, the moisture content of the modified and control samples was the same. The parameters compared included: modulus of elasticity, stress at proportionality limit, relative linear strain at proportionality limit and accumulated elastic energy. Thermal modification of ash wood at 190°C contributed to the deterioration of its mechanical parameters determined during compression in tangential direction; the deterioration was greater for wood tissue of higher moisture content. The values of mechanical parameters of thermally modified wood (except for elastic energy), determined in compression test in tangential direction, decrease with the its increasing moisture more than for the control wood