木质材料变参数流变模型的研究

如何建立木材在变载荷下蠕变的数学模型，是木材流变学在理论研究和生产应用中迄今尚未解决的问题。本文突破传统的常参数建模方法，提出一种变参数流变模型的概念，并以两单元的变参数Maxwell模型拟合了杨木的蠕变性质。结果表明：采用变参数流变模型不仅能以较少的弹、粘单元组合代替常参数的多个弹、粘单元组合模型，使流变参数便于求解，且对不同形式变载荷下的蠕变变形，均有很高的拟合精度。

THE STUDY ON VARIABLE COEFFICIENTS RHEOLOGICAL MODEL OF WOOD

How to establish creep model of under change loads are unfathomed contents in theory studies and applications of wood rheology. This paper broke through traditional modeling method and put forward a concept of variable coefficients rheological model that parameters of elements change with time and loads. The two units Maxwell body of variable coefficients simulated for the creep behavior of poplar wood. The results showed that the variable coefficients rheological model could use a few of spring damper unit instead of multi unit one, therefore the rheological coefficients could be solved easily. The variable coefficients rheological model could draw up the creep of wood accurately under the different forms of loads.