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vol.14 número3Análisis del comportamiento reológico y termo-higromecánico en probetas de tableros tensados de madera para puentes a condiciones ambientales variablesDeterminación de un elemento de volumen representativo de probetas de tablero tensado índice de autoresíndice de assuntospesquisa de artigos
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Maderas. Ciencia y tecnología

versão On-line ISSN 0718-221X

Resumo

VALENZUELA C, Paulina; BUSTOS A, Cecilia; LASSERRE, Jean Pierre  e  GACITUA E, William. Characterization nanomechanics of wood cell structure and anatomy in Eucalyptus nitens and its relation to the cracking and fractures in round wood. Maderas, Cienc. tecnol. [online]. 2012, vol.14, n.3, pp.321-327.  Epub 12-Set-2012. ISSN 0718-221X.  http://dx.doi.org/10.4067/S0718-221X2012005000006.

The aim of this study was to define the minimum volumen in trees of E. nitens that characterize the mechanical and anatomy behavior for non-destructive sampling. The trees were cut from sites located in Mulchen and Yungay in the region of Bío Bío. Relationships were found between nanomechanical properties, wood anatomy and wood cracks and fractures. The response variables were the ductility ratio (E/H) and the modulus of resilience (ur), in the S2 layer and middle lamella. The results showed that the representative volume, from E. nitens families is at 3 meter high from base of the trees and between the 5th to 7th annual rings. Also, it was established that the middle lamella is more brittle than the S2 layer. Relationship between the vessels morphology and the level of the wood cracking was observed. A high area of vessels, a high vessel diameter and a small frequency of them, resulted in high cracking. The cracks were mainly concentrated in the first meters of tree, were we found a good relationship of this response variable with the E/H ratio for the middle lamella; there was a significant change of this ratio at 3 meters high. Cracks were evident on earlywood and from the 5th to the 7th annual rings.

Palavras-chave : Nanomechanical properties; nanoindentations; wood anatomy; wood ultrastructure; cracks.

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