毛白杨静态压缩力学性能研究及吸能分析

目的 获取毛白杨的静态压缩力学性能.方法 针对含水率为14.6％,密度为0.544 g/cm3的毛白杨木材试件进行静态压缩实验,通过实验获得毛白杨顺纹、横纹径向和横纹弦向的抗压模量、准静态压缩应力-应变曲线,并对不同方向的吸能特性进行分析.结果 毛白杨木材顺纹、横纹径向和横纹弦向抗压弹性模量分别为10.49 GPa、8...

Investigation of Quasi-static Compression Mechanical Properties of Populus Tomentosa

In order to get the quasi-static compression mechanical properties of populus tomentosa, quasi-static compression tests were proposed to the populus tomentosa specimen with a moisture content of 14.6% and a density of 0.544 g/cm3. Compression modulus and stress-strain curves along axial, radial and tangential loading directions were obtained, and the energy-absorbing were analyzed according to the test results. Experimental results show that the compression modulus of populus tomentosa under axial, radial and tangential is 10.49 GPa, 887 MPa and 504 MPa, respectively. The failure modes are fiber buckling and wrinkle when loading direction is along the grain. When loading direction is along radial across the grain, the failure mode is crack along the radial direction. And the failure mode is separation between the grains when the loading direction is tangential across the grain. Energy absorption density under the axial compression is the highest at the same strain. Energy absorption curves under radial and tangential are almost the same when strain is less than 0.45, then the energy absorption under tangential is slightly higher than that of the radial orientation with the strain increasing.