文献类型：期刊文献

英文题名：Effect of growth ring width, pith and visual grade on bending properties of Chinese fir plantation dimension lumber

作者：Jiang, Jinghui[1] Lu, Jianxiong[1] Ren, Haiqing[1] Long, Chao[1]

第一作者：江京辉

通信作者：Lu, JX[1]

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

年份：2012

卷号：70

期号：1-3

起止页码：119-123

外文期刊名：EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS

收录：;EI(收录号：20121514942287);Scopus(收录号：2-s2.0-84859552832);WOS:【SCI-EXPANDED(收录号:WOS:000298657600016)】；

基金：The author extends gratitude to Prof. Xiuqin Luo and Dr. Yafang Yin for their support of this study. Parts of this work were financially supported by machining and processing technology of constructional lumber supported by key project of Ministry of Science and Technology (2006BAD18B07).

语种：英文

外文关键词：Bending strength - Grading

摘要：According to NLGA standard grading rules, the dimension lumber of plantation Chinese fir was graded into four grades, i.e. SS, No. 1, No. 2 and No. 3. The bending strength and stiffness were determined according to ASTM D4761-05. The results showed that there was a significant difference in both MOE and MOR of the lumber with and without pith for SS and No. 2 grades, but this was not the case for No. 3 grade lumber. The mean MOE and MOR decreased as growth ring width (GRW) of each graded lumber increased. MOR and MOE of the SS and No. 2 grade dimension lumber with GRW < 6 mm were significantly different from that of GRWa parts per thousand yen6 mm group. In regard to plantation Chinese fir, it is suggested that No. 2 and better grades should not have pith and the GRW must be less than 6 mm. For the lumber with pith and GRWa parts per thousand yen6 mm, it should be graded into No. 3 grade.