Advances in the study of mechanical properties and constitutive law in the field of wood research

2016 Global Conference on Polymer and Composite Materials

材料科学;化学

Zhao, S.^1 ; Zhao, J.X.^1 ; Han, G.Z.^1

Mechanical Engineering Department, Shijiazhuang Mechanical Engineering College, Shi Jia-Zhuang, Hebei

050003, China^1

关键词: Anisotropic material;    Anisotropic models;    Constitutive law;    High moisture;    High strain rates;    Mechanical properties of wood;    Microscopic views;    Natural factors;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/137/1/012036/pdf
DOI  :  10.1088/1757-899X/137/1/012036

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This paper presents an overview of mechanical properties and constitutive law for wood. Current research on the mechanical properties of wood have mostly focused on density, grain, moisture, and other natural factors. It has been established that high density, dense grain, and high moisture lead to higher strength. In most literature, wood has been regarded as an anisotropic material because of its fiber. A microscopic view is used in research of wood today, in this way, which has allowed for clear observation of anisotropy. In general, wood has higher strength under a dynamic load, and no densification. The constitutive model is the basis of numerical analysis. An anisotropic model of porous and composite materials has been used for wood, but results were poor, and new constitutions have been introduced. According to the literature, there is no single theory that is widely accepted for the dynamic load. Research has shown that grain and moisture are key factors in wood strength, but there has not been enough study on dynamic loads so far. Hill law has been the most common method of simulation. Models that consider high strain rate are attracting more and more attention.