Research on Tensile Properties and Damage Mechanism of Larix Wood Along Grain

In order to explore the tensile properties and damage mechanism of larch wood along grain, Northeast Larch was taken as the research object. The deformation characteristics, failure mode and stress-strain curve properties of larch wood under tension along grain direction were analyzed by monotonic tensile test on 12 specimens. By means of scanning electron microscopy, the damage and fracture characteristics of wood fiber were analyzed from the microscopic point of view, and the mono-stress failure mechanism of wood was further revealed. The results show that the body of larch wood can be divided into three stages: rapid growth, slow growth and brittle fracture. Due to the difference between early and late wood tracheids, longitudinal splitting and transverse tearing of tracheid walls usually occur. On this basis, a constitutive model was established to describe the longitudinal tension of larch wood.