Analysis Cell Deformation of Undersize Log of Northeast Larch

Abstract

As the potential of using natural log is explored in the temporary structure, especially in template as the shores, it is important to gain further understanding of the microstructure and properties of cells such as undersize tree of Northeast larch that under macro buckling load. The research described in this paper focuses, for the first time, after the initial preparation by microtoming, on investigating the microstructure of log by analyzing of the ESEM images, and a model for deformation and failure mechanism of the cell had been proposed, then, the properties of cells were calculated through image software. Results show that the cells including early wood and late wood under without extra load are regularly arrayed, the deformation of the wall was induced by asymmetric out of plane twisting and splitting due to buckling of the logs, failure of the early wood cell is easily than late wood that following the large deformation occurs at plasticity, and two properties including late wood percentage and cell wall percentage has a direct proportion with the strength of log. The presented results indicate that it is improve to understand and analyze the failure process of cell when the log under concrete compression loading, and the reason that log as sustainable material is due to the unbroken cell clusters recover themselves as quickly as possible during at a certain enough time.