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.