Mechanical properties of heat-treated wooden material utilized in the construction of outdoor sitting furniture

Abstract

The present study examined the bending moment capacity and rigidity of T-type out-of-plane furniture joints and investigated the effects of heat treatment, wood species, and joint type factors on these joints. Heat treatment method clearly decreased the modulus of rupture (MOR) and the modulus of elasticity (MOE) of selected wood species. The bending strength of wood samples was reduced after the heat treatment, decreasing with increased loss of mass. For the heat-treated T-type joints, maximum bending strength values were obtained with Iroko (Chlorophora excelsa) for both mortise and tenon (MT) joints and blind MT (BMT) joints. The lowest reduction in bending strength was observed in Ash (Fraxinus excelsior L.) constructed with MT joints and with BMT joints. In general, the BMT joint had higher bending strength than MT joints. The best rigidity constant (7.21) was obtained with control Iroko BMT joints, while the worst rigidity constant (15.10) was obtained with control Oriental spruce (Picea orientalis L.) MT joints. In terms of heat-treated samples, the best rigidity constant (7.59) was obtained with Black pine (Pinus nigra L.) MT joints, while the worst rigidity constant (14.01) was obtained with Oriental spruce BMT joints. The maximum performance in joint stiffness was determined for Iroko sample BMT joints and Iroko MT joints. Lowest reduction in joint stiffness was observed in Scotch pine MT joints and Ash BMT joints. Heat treatment, wood type, and joint type had a significant effect on the bending strength of T-type MT post-rail joints. BMT joints produced from heat-treated Iroko wood can be considered as the most durable T-type joint for outdoor sitting furniture construction.

Changes in Colour, Strength and Chemical Properties of Oil Heat Treated 18-Years Old Planted Acacia mangium

“…Sampling height is significantly affected the value of MOE (Table 10). The reduction in MOE of heat treated wood is consistent with research carried out by Tankut et al, (2014) which state that loss of MOE in heat treated wood is between 19% and Estevez et al (2009) andSahin Kol (2010) suggest that the reduction in MOE can be around 1 to 72%.…”

The Effect of Chemical Changes during Heat Treatment on the Color and Mechanical Properties of Fir Wood

“…Changes of the mechanical properties due to a higher temperature were reported also by Tankut et al (2014), Boonstra et al (2007), Silva et al (2013), and Yildiz et al (2006). However, the extent of these changes depends on the treatment conditions, e.g., temperature, time, atmosphere, heating technique, size, and shape of the sample.…”

Effect of Heat Treatment and Use of Aluminum Foil on Physical and Mechanical Properties of Wood

“…The decrease in bending strength due to temperature treatment is likely due to the destruction of wood cell wall especially hemicellulose. It was also discovered that the bending strength of wood samples after heat treatment decreases with increased loss of mass [13]. Table 5 shows the effect of temperature treatment and aluminum foil wrapping on the bending strength.…”