基于有限元法超细木粉的力学分析  

Mechanics Analysis about Superfine Wood Flour Based on Finite-element Method

作　　者：杨冬霞[1] 范长胜[2] 

机构地区：[1]哈尔滨学院,哈尔滨150086 [2]东北林业大学机电工程学院,哈尔滨150040

出　　处：《森林工程》2015年第2期88-91,共4页Forest Engineering

基　　金：黑龙江省教育厅科学技术研究项目(12533043);哈尔滨市科技项目(2014RFQXJ144);哈尔滨学院博士基金(HUDF2014-011)

摘　　要：超细木粉属于微纳米木粉,将其填加到复合材料中可使复合材料的性能得到改善。依据超细木粉粒径的大小和木材细胞的结构特点,分析在加工超细木粉过程中必须进行细胞的破壁力计算,并以针叶材细胞的微观结构为受力分析依据,建立单一细胞受力模型。用四根铰接桁架杆单元来模拟细胞外壁,用两根交叉铰接桁架杆来模拟细胞内压力,即用六根桁架杆单元结构模拟单一针叶材细胞。对单一细胞模型外施均布载荷分析各杆单元的受力、变形及压溃情况,利用结构力学和有限元法分别对单一细胞和多细胞状态下进行模拟受力分析。将其结果作为设计超细木粉机加工刀具的理论依据。Superfine wood powder belongs to the micro nano wood powder,which can improve the performance of the composite materials after adding it to the composite material. In the paper,according to the size of the superfine wood powder particle and the structure characteristics of wood cells,the necessity of cell wall-breaking force calculation which must be done in the process of processing superfine wood powder was analyzed. The soft wood cell microstructure was used as the force analysis basis,and a single cell stress model was established. The cell walls were simulated by four pillars hinged truss bar elements,and the pressure inside the cell was simulated by two cross hinged truss rods,that is to simulate the single soft wood cells with six truss unit structure. The uniformly distributed load was applied on the single cell mode to analyze the stress and deformation crushing condition of each bar unit. The structural mechanics and finite element method were used respectively to simulate the stress analysis of a single cell and processing raw materials with multiple cells. The results can be used as the theoretical basis for the design of super fine wood powder machine tool. If the superfine wood powder can be processed in batch,the study will lay a solid foundation for the realization of wood nanotechnology.

关 键 词：超细木粉 有限元法 桁架 矩形单元 

分 类 号：S718.43[农业科学—林学]