We evaluated the shear strength parallel to the fiber in an adhesive
joint between adhesive type polyvinyl acetate (PVA) and three wood
species of Costa Rica and from plantation: Acacia mangium Willd.,
Tectona grandis L.f. y Terminalia amazonia A. Chev., according to
ASTM standards. The results showed that shear strength of adhesive
laminated joint in the three species was higher on the strength of the
same kind of strength in solid wood. In A. mangium was obtained an
increase 9.7% for T. grandis and T. Amazonia an increase 4.4%. The
species T. grandis with the highest specific gravity (SG) value, showed
the best in both test of shear strength and higher wood failure
percentage in the adhesive joint. The applied adhesive is suitable
for making laminated adhesive joints by principal side with pieces
of wood in dry condition. Particularly, the adhesive is recommended
for T. grandis, A. mangium and T. amazonia in that order of priority,
according to the results obtained.

Evaluación de una unión laminada con adhesivo tipo PVA y maderas de plantación: Acacia mangium, Tectona grandis y Terminalia amazonia

It was determined the Young`s elastic modulus (EMO) by three methods in a five-layer plywood from Eucalyptus nitens wood. The control method had the lowest variability (22,45 %). The lower standard error respect to control method, corresponds to method 2 with a coefficient of 0,566. While, the higher variability correspond to method 3 (29,91%). However, the ANOVA indicates not significant difference between the means of each method. The average of Young`s elastic modulus obtained of 10,18 GPa in axial direction, indicates that the elastic behavior of plywood is similar to E. nitens solid wood (9,6 GPa). In addition, EMO obtained indicates that the plywood meets the requirements of brazilian standards NBR 9531 and NBR 9523 and european EN 310-1993, allowing its use in interior light construction, as concrete mold, furniture and general uses, although, according to APA standard not classified for heavy construction, marine and industrial use.

https://dialnet.unirioja.es/descarga/articulo/5123319.pdf

Freddy Muñoz-Acosta

Papers

Determinación del módulo elástico de Young en tableros contrachapados de madera de Eucalyptus nitens (Deane & Maiden)