Gürsel Colakoglu, Semra Colak, Ismail Aydin, Umit C. Yildiz, Sibel Yildiz. (2003). Effect of boric acid treatment on mechanical properties of laminated beech veneer lumber. Silva Fennica vol. 37 no. 4 article id 488. https://doi.org/10.14214/sf.488

Keywords: mechanical properties; LVL; boric acid; beech veneer

Abstract | View details | Full text in PDF | Author Info

Laminated veneer lumber (LVL) made from beech wood veneers treated with boric acid by using dipping method was tested for some mechanical properties following different standards. The values for treated LVL varied around the mean values of untreated LVL panels for static bending strength in the grain direction and modulus of elasticity; decreased for compression and splitting strengths, perpendicular to the grain; increased for compression strength parallel to the grain, and for Brinell hardness and pull-out strength of screw, perpendicular to surface.

Colakoglu, Karadeniz Technical University, Faculty of Forestry, Forest Industry Engineering Section, 61080 Trabzon, Turkey E-mail: gursel@ktu.edu.tr
Colak, Karadeniz Technical University, Faculty of Forestry, Forest Industry Engineering Section, 61080 Trabzon, Turkey E-mail: sc@nn.tr
Aydin, Karadeniz Technical University, Faculty of Forestry, Forest Industry Engineering Section, 61080 Trabzon, Turkey E-mail: ia@nn.tr
Yildiz, Karadeniz Technical University, Faculty of Forestry, Forest Industry Engineering Section, 61080 Trabzon, Turkey E-mail: ucy@nn.tr
Yildiz, Karadeniz Technical University, Faculty of Forestry, Forest Industry Engineering Section, 61080 Trabzon, Turkey E-mail: sy@nn.tr

Category : Research note

article id 325, category Research note

Daniel Eriksson, Henrik Lindberg, Urban Bergsten. (2006). Influence of silvicultural regime on wood structure characteristics and mechanical properties of clear wood in Pinus sylvestris. Silva Fennica vol. 40 no. 4 article id 325. https://doi.org/10.14214/sf.325

Keywords: silvicultural regime; structural characteristics; mechanical properties

Abstract | View details | Full text in PDF | Author Info

The objective of the study presented here was to evaluate the influence of two contrasting silvicultural regimes on the structural characteristics and mechanical properties of different wood tissue types at different heights in Scots pine (Pinus sylvestris L.) trees, and reasons for these differences. Wood samples were taken from two stands (a dense 85-year-old stand established by direct seeding and a 56-year-old widely spaced stand established by planting, designated SDR and PWR, respectively in the boreal zone of Sweden). The wood properties associated with the examined silvicultural regimes differed, in terms of both structural characteristics (with up to fivefold differences between SDR and PWR) and mechanical properties (with up to almost threefold differences between SDR and PWR). Differences between the regimes were highest for stiffness, followed by strength and hardness properties and lowest for relative stiffness after 1000 h of loading (creep) (with higher parameter values for SDR than for PWR in each case). The rankings could be explained by differences among the mechanical properties in their sensitivity to maturation of wood characteristics. In conclusion, silvicultural regimes have great potential to regulate wood structural characteristics and mechanical properties, apparently due to the influences of the green crown and growth rate on the vascular cambium, the strength of which vary throughout the rotation period. A silvicultural regime could therefore be seen as a tool that can be used to select material qualities and to make wood a more homogenous material for engineers.

Eriksson, Swedish University of Agricultural Sciences, Vindeln Experimental Forest, Svartberget Fieldstation, SE-922 91 Vindeln, Sweden E-mail: daniel.eriksson@esf.slu.se
Lindberg, Luleå University of Technology, Division of Polymer Engineering, SE-971 87 Luleå, Sweden E-mail: hl@nn.se
Bergsten, Swedish University of Agricultural Sciences, Department of Silviculture, SE-901 83 Umeå, Sweden E-mail: ub@nn.se

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