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中国农学通报

中国农学通报 ›› 2012, Vol. 28 ›› Issue (1): 60-64.doi: 10.11924/j.issn.1000-6850.2011-1911

• 林学 园艺 园林 • 上一篇    下一篇

米老排三向弹性常数研究

刁海林 姜金英 蔡道雄 唐继新 罗建举   

  • 收稿日期:2011-06-28 修回日期:2011-08-08 出版日期:2012-01-05 发布日期:2012-01-05
  • 基金资助:

    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”

Study on Three-dimensional Elastic Constants of Mytilaria laosensis

  • Received:2011-06-28 Revised:2011-08-08 Online:2012-01-05 Published:2012-01-05

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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。笔者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=12196 MPa、ER=1415 MPa、ET=791 MPa；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。

关键词: 杏, 杏, ISSR, 优化

Abstract:

Getting the three-dimensional (longitudinal direction, radial direction and tangential direction) elastic constants and poisson’s ratios of Mytilaria 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 (EL, ER, ET) and poisson’s ratios (μL, μR, μT). The elastic modulus of Mytilaria laosensis were EL=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, μTL=0.035, μTR=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.

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