文献类型：期刊文献

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.

机构：[1] Research Institute of Wood Industry, Chinese Academy of Forestry, 518 Office, Xiangshan Road Haidian District, Beijing 100091, China

年份：2012

卷号：517

起止页码：677-682

外文期刊名：Key Engineering Materials

收录：EI(收录号：20122915252004)

语种：英文

外文关键词：Lumber - Multivariant analysis - Regression analysis

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, theΣ[(IK/Ig)·(MK/Mo)] of all knots and the average density ρa 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/Eclear = BΣ[(IK/Ig)·(MK/Mo)]+C. ? (2012) Trans Tech Publications.