文献类型：期刊文献

中文题名：米老排三向弹性常数研究

英文题名：Study on Three-dimensional Elastic Constants of Mytilaria laosensis

作者：刁海林[1] 姜金英[1] 蔡道雄[2] 唐继新[2] 罗建举[1]

第一作者：刁海林

机构：[1]广西大学林学院;[2]中国林业科学研究院热带林业实验中心

年份：2012

卷号：28

期号：1

起止页码：60-64

中文期刊名：中国农学通报

外文期刊名：Chinese Agricultural Science Bulletin

收录：CSTPCD;;CSCD:【CSCD_E2011_2012】；

基金：广西林业重大招标项目"主要速生人工林树种材性改良与深加工利用"(桂林科字[2009]第7号)

语种：中文

中文关键词：米老排;弹性模量;泊松比;弹性常数;电测法

外文关键词：Mytilaria laosensis; elastic modulus; poisson＇ s ratio; elastic constants; electrical testing method

分类号：S781.23

摘要：通过实验研究获得米老排三向(纵向L、径向R、弦向T)弹性模量和三向泊松比,以掌握米老排弹性变形特性,为进一步研究米老排的力学性质和为木结构设计提供理论依据。以电阻应变片为变形传感器,采用单轴压缩,并通过电阻应变仪进行应变测量,再由材料力学方法获得红锥的三向弹性模量和三向泊松比。米老排的三向弹性模量分别为EL=12196MPa、ER=1415MPa、ET=791MPa;三向泊松比分别为μLT=0.634、μLR=0.467、μRT=0.762、μRL=0.045、μTL=0.035、μTR=0.435。实验结果表明:米老排的纵向弹性模量最大,径向弹性模量次之,弦向弹性模量最小。泊松比则μRT最大,μTL最小,即当R方向加载时,T向的变形最大;T方向加载时,L向的变形最小。
Getting the three-dimensional （longitudinal direction, radial direction and tangential direction） elastic constants and poisson＇ s ratios of Mytilada laosensis by experimental research, so that the elastic deformation characteristics of Mytilaria laosensis were obtained for further study on mechanical properties and for the theory basis on design of wood structure. Strain gauge was acted as the deformation sensor. Strains were measured by resistance strain gauge with uniaxial compression test, then it could be obtained the elastic modulus （E1, ER, ET） and poisson＇ s ratios （μL,μR, μT）. The elastic modulus of Mytilaria laosensis were E,= 12196 MPa, ER=1415 MPa, ET=791 MPa. The poisson＇ s ratios of Mytilaria laosensis were μLT=0.634, μLR= 0.467, μRT=0.762, μRL=0.045, μRL=0.035, p.Ca=0.435. The results showed that： longitudinal elastic modulus was maximum, then radial elastic modulus and tangential elastic modulus was minimum. Of all poisson＇ s ratios μRT was maximum, μTL was minimum. That was to say, when loading in R direction, the variation of T direction was maximum, when loading in T direction, the variation of L direction was minimum.