Micromechanical modeling and nonlinear properties of wood

Abstract

In this paper, from the microcosmic angle, the natural supramolecular structure in the wood cell wall of the pure wood has been established. The horizon or opinion on the positional relation and distribution mode among the cellulose microfibrils (CMFs) is presented. The arrangement of the matrix (hemicellulose and lignin) and systematical description of the supramolecular structure about cellulose have been studied. We sought to clarify the mechanical roles of cellulose and matrix polysaccharides by developing a model based on polymer physics that recapitulates aspects of assembly and tensile mechanics of cell walls. Next, we discuss the formulation, solution, and steps of using asymptotic homogenization theory to solve the effective elastic tensor of online viscoelastic composite materials with periodic microstructures and pores. The established supramolecular structure model has been simulated by using molecular dynamics simulation software. The theoretical closed-form solution and numerical solution are studied comparatively. Finally, experimental results were contrasted to the academic calculated value.