摘要
针对木材的非匀质、各向异性特点,从木材细观结构出发,应用数字图像处理技术在板材上顺序采集、提取生长轮早晚材细胞数据,完成各层生长轮弹性模量计算,结合板材截面图像构建出落叶松试件三维层合材料模型,并通过有限元预测其抗弯弹性模量。首先,应用高倍光学显微镜采集试件截面细胞图像,分别测定试件截面中各个生长轮内胞壁率、胞壁厚、径向宽度、切向宽度等参数;根据预测模型,以密度为单一变量,推导出各层早晚材的弹性模量;将试件按早材、晚材依次叠加的层合材料处理,并利用试件截面图像的早晚材分布信息构建试件三维层合材料模型,利用UG软件建立试件的三维模型,在有限元软件中施加载荷预测木材抗弯弹性模量。按照木材抗弯弹性模量的《GB1936—1980》国家测试标准,加工、测量了10组试件的抗弯弹性模量真值,分别运用本方法和匀质材料预测方法对试件的抗弯弹性模量进行了预测,平均误差分别为5.7%和17.3%。实验结果表明,该方法较匀质材料预测方法更为准确。
According to the non-homogeneous and anisotropic characteristics of wood,from the microstructure of wood,the digital image processing technology is used to collect and extract the data of different age.The elastic modulus of the larch specimens was constructed by using the plate section image,and the flexural modulus of the larch specimens was predicted by finite element method.Firstly,the images of the cross-section cells were collected by high-power optical microscope.The parameters such as cell wall rate,cell wall thickness,radial width and tangential width were measured,respectively.According to the prediction model,the elastic modulus of each layer was deduced.The specimen was processed by the superimposed material of the early and late materials,and three-dimensional laminated material model of the specimen was constructed by using the distribution information of the specimen image.The software builds a three-dimensional model of the specimen,and the load is used to predict the flexural modulus of the wood in the finite element software.According to the GB1936-80national standard of flexural elastic modulus of wood,the flexural modulus values of the10sets of specimens were measured and the bending of the specimen was tested by the method and the traditional homogeneous material prediction method.Elastic modulus data form this method and the traditional homogeneous material prediction method were predicted,and the average errors were5.7%and17.3%,respectively.
作者
于慧伶
潘屾
张怡卓
Yu Huiling;Pan Shen;Zhang Yizhuo(Northeast Forestry University, Harbin 150040, P. R. China)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2018年第12期108-111,共4页
Journal of Northeast Forestry University
基金
中央高校基本科研业务费专项资金项目(2572017CB34)
黑龙江省自然科学基金项目(C2017005)
关键词
落叶松
弹性模量预测
细胞力学
有限元分析
Larch
Elastic modulus prediction
Cell mechanics
Finite element analysis
