Search

Se desarrolló una metodología basada en nanoindentaciones y análisis de la ultraestructura de células de madera de Eucalyptus nitens (Deane et Maiden) para explorar los factores que generan la aparición de fallas en la madera debido a tensiones de crecimiento. Se estudió madera normal y madera con mesogrietas. Existieron diferencias significativas en la frecuencia de vasos y módulo de elasticidad de la pared S2 entre los dos tipos de madera estudiadas. Se identificó como causa de la fractura de la lámina media y pared S1, fractura definida como mesogrieta, el factor de concentración de esfuerzos y la capacidad de almacenamiento de energía por parte de las fibras de madera, presentando ambos factores diferencias significativas entre las muestras de madera analizadasUsing nanoindentations and ultrastructure analysis, we developed a methodology to explore factors that may contribute to failures in Eucalyptus nitens (Deane et Maiden) due to growth stresses. Two types of wood were analyzed; normal wood and wood with meso-cracks. Factors contributing to cracking included the vessel frequency and mechanical properties of the S2 layer measured with nanoindentations. Micro and mesocracks propagated throughout the middle lamella and S1 layer due to an increased stress concentration that was mainly

Using nanoindentations and ultrastructure analysis, we developed a methodology to explore factors that may contribute to failures in Eucalyptus nitens (Deane et Maiden) due to growth stresses. Two types of wood were analyzed; normal wood and wood with meso-cracks. Factors contributing to cracking included the vessel frequency and mechanical properties of the S2 layer measured with nanoindentations. Micro and mesocracks propagated throughout the middle lamella and S1 layer due to an increased stress concentration that was mainly caused by vessels and the characteristic strain energy density of the cell wall. [ABSTRACT FROM AUTHOR]