Two-dimensional heterogeneous lattice model simulation of tensile fracture in Dahurian Larch

Based on the understanding of the wood, a two-dimensional heterogeneous lattice model is proposed to simulate the process of Dahurian Larch wood damage and fracture under tensile loadings. In this simulation, the lattice models rationally incorporate growth-ring geometry, differences in strength and stiffness between earlywood and latewood, and grain perturbation in the longitudinal direction of the wood. In addition to the numerical simulation, uniaxial tensile experiments are designed to study the fracture process of the Dahurian Larch wood. The fracture processes of the numerical simulation basically agree with the experimental observations, which validate the feasibility of the lattice model. Simulations demonstrate that the inclusion of grain perturbation and the differences between earlywood and latewood in the mechanical properties are necessary for the lattice model to predict realistic crack propagation paths. The simulated load-displacement curve of Dahurian Larch wood fits well with the results of the uniaxial tension experiments.