Author
For further details log on website :
http://www.centrumdp.sk/wr/01/01.pdf
Haiyang Zhang, Xiaoning Lu*
Nanjing Forestry University, College of Wood Science and Technology Nanjing, China
(Received November 2012)
ABSTRACT
Laminated strand lumber as a structural composite lumber material has gained remarkable acceptance in light commercial and residential construction. A model was established to predict the elastic properties of the laminated strand lumber. The model assumes homogeneity in each panel layer to allow for multiple-layer panels to be simulated. The elastic constants of each panel layer were calculated by the modified elasticity energy principle in which the wood strands were regarded as the reinforced phase and the adhesive resin as the matrix. The panels with different structures were manufactured to verify the model. The predictions of the model match well with the measured results. The model may be helpful in design and manufacture of the laminated strand lumber.
KEYWORDS: Wood based composites, laminated strand board, elasticity energy principle; laminated theory, engineering constants.
INTRODUCTION
Laminated strand lumber (LSL) is a structural wood-based composite material consisting of oriented wood strands that are spray blended with adhesives and hot-compressed to form panels. The thickness of the wood strands for producing LSL is 0.5 to 2 mm and the length is shorter than 300 mm. Low density woods are the preferred raw material which permits property enhancement through densification. It can be produced from smaller diameter and low quality trees thereby reducing our dependence on old growth forests. Because LSL sometimes has stronger mechanical properties and less variability than solid lumber, it is an attractive alternative to solid sawn lumber and has gained a lot of research interest in many areas, including basic production technology, property improvement and product development (Moses et al. 2003, Denizli-Tankut et al. 2004, Josčák et al. 2006, Me et al. 2008, Ferraz et al. 2009, Ma and Yang 2011). )
Nanjing Forestry University, College of Wood Science and Technology Nanjing, China
(Received November 2012)
ABSTRACT
Laminated strand lumber as a structural composite lumber material has gained remarkable acceptance in light commercial and residential construction. A model was established to predict the elastic properties of the laminated strand lumber. The model assumes homogeneity in each panel layer to allow for multiple-layer panels to be simulated. The elastic constants of each panel layer were calculated by the modified elasticity energy principle in which the wood strands were regarded as the reinforced phase and the adhesive resin as the matrix. The panels with different structures were manufactured to verify the model. The predictions of the model match well with the measured results. The model may be helpful in design and manufacture of the laminated strand lumber.
KEYWORDS: Wood based composites, laminated strand board, elasticity energy principle; laminated theory, engineering constants.
INTRODUCTION
Laminated strand lumber (LSL) is a structural wood-based composite material consisting of oriented wood strands that are spray blended with adhesives and hot-compressed to form panels. The thickness of the wood strands for producing LSL is 0.5 to 2 mm and the length is shorter than 300 mm. Low density woods are the preferred raw material which permits property enhancement through densification. It can be produced from smaller diameter and low quality trees thereby reducing our dependence on old growth forests. Because LSL sometimes has stronger mechanical properties and less variability than solid lumber, it is an attractive alternative to solid sawn lumber and has gained a lot of research interest in many areas, including basic production technology, property improvement and product development (Moses et al. 2003, Denizli-Tankut et al. 2004, Josčák et al. 2006, Me et al. 2008, Ferraz et al. 2009, Ma and Yang 2011). )
For further details log on website :
http://www.centrumdp.sk/wr/01/01.pdf
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