文献类型：会议论文

英文题名：The Effect of Knots on Bending Modulus of Elasticity of Dimension Lumber

作者：Zhong, Yong[1] Ren, Haiqing[1] Lou, Wanli[1] Li, Xiazhen[1]

第一作者：钟永

通信作者：Zhong, Y[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Off 518, Beijing 100091, Peoples R China

会议论文集：13th International Conference on Non-Conventional Materials and Technologies

会议日期：SEP 22-24, 2011

会议地点：Changsha, PEOPLES R CHINA

语种：英文

外文关键词：knot; dimension lumber; MOE; theoretical model

年份：2012

摘要：The defects, especially for knot, seriously affect the bending properties of wood. In this paper, full scale specimens and clear specimens for bending test, cut from dimension lumbers of Larix gmelinii with different kinds of knots, aimed to predictive accuracy of the modulus of elasticity(MOE) in bending and to improve the accuracy of MOE by multivariate regression analysis with density and knot information. According to the regression analysis results, the Sigma(IK/Ig)center dot(MK/Mo)] of all knots and the average density rho a showed the best predictive accuracy of MOE for full scale specimen(Efull), with 0.674 of R2 and 1.15 of RMSE. Based on the ratio of regression parameter B/A of independent variables for density and knots information, the knots had less influential than density on influencing Efull. Finally, a simplified theoretical model that can be used to calculate MOE for dimension lumber, was defined as Efull/Eelear= B Sigma(IK/Ig)center dot(MK/Mo)]+C