文献类型：期刊文献

中文题名：3种无损检测技术评估足尺规格材的静态弹性模量

英文题名：Evaluation of modulus of elasticity for dimension lumber by three nondestructive techniques

作者：江京辉[1] 吕建雄[1] 任海青[1] 骆秀琴[1] 龙超[1] 郭伟[1]

第一作者：江京辉

机构：[1]中国林业科学研究院木材工业研究所国家林业局木材科学与技术重点实验室

年份：2008

卷号：25

期号：3

起止页码：277-281

中文期刊名：浙江林学院学报

外文期刊名：Journal of Zhejiang Forestry College

收录：北大核心:【北大核心2004】；CSCD:【CSCD_E2011_2012】；

基金："十一五"国家科技支撑项目(2006BAD18B07);国家科学技术部林业工程技术标准体系构建子课题(2004DEA70900-1)

语种：中文

中文关键词：林业工程;横向振动;纵向基频振动;超声波;弹性模量;规格材

外文关键词：forest engineering; transverse vibration; longitudinal fundamental frequency vibration; ultrasonic

分类号：S781.2

摘要：首先利用横向振动、纵向基频振动和超声波3种无损检测法获得天然林樟子松Pinus sylvestris var.mongolica足尺规格材(38 mm×89 mm×4 000 mm)和人工林杉木Cunninghamia lanceolata足尺规格材(45 mm×90 mm×2 500 mm)动态弹性模量,同时根据D198-99(American Society for Testing and Materials)标准测试了其静态弹性模量;进而通过探讨动态与静态弹性模量之间的相互关系。研究结果表明,无论对哪种木材的规格材,利用上述3种无损检测方法获得动态弹性模量(Etv,Efr,Eusw)与静态弹性模量(Etru)平均值之间的关系为:Eusw>Efr>Etru>Etv;动态弹性模量与静态弹性模量之间的线性相关极显著,表明这3种无损检测方法均可以用于评估规格材的静态弹性性质;从设备的方便、可靠和易操作等方面综合考虑,利用纵向基频振动法来评估规格材的静态弹性模量,其预测效果更为理想;天然林樟子松和人工林杉木比较而言,动静态弹性模量线性相关决定系数前者大于后者,即预测天然林樟子松规格材效果更好。
Dynamic bending modulus of elasticity of Mongolia scotch pine （Pinus sylvestris var. mongollca） full dimension lumber （38 mm × 89 mm × 4 000 mm） and Chinese fir （Cunninghamia lanceolata） plantation dimension lumber （45 mm × 90 mm × 2 500 mm） were tested by three non-destructive techniques, i. e. transverse vibration method, longitudinal fundamental frequency vibration method and ultrasonic wave method. At the same time, the static modulus elasticity of the above specimens were tested according to ASTM D198- 99. The results showed that the value of dynamic and static modulus of elasticity followed the sequence as the following,Eusw〉Efr〉Etru〉Etv, the relationship between dynamic and static modulus of elasticity concerning the three methods was significant at 0. 01 level, indicating that all the three nondestructive methods could be used to predict the bending properties of dimension lumber. Furthermore, considering the operation of the equipment, longitudinal fundamental frequency vibration technique was the most accurate, convenient, reliable, easy and practical method. It was also found that the coefficient of determination （R2） obtained by using the three nondestructive techniques for Chinese fir plantation full dimension lumber was lower than that of Mongolia scotch pine full dimension lumber, estimating the static modulus elasticity of Mongolia scotch pine was more accurate than that of plantation Chinese fir. [ Ch, 6 fig. 1 tab. 17 ref. ]