杨树与落叶松原木中应力波的不同传播速度

Different Propagation Velocity of Stress Wave in Poplar and Larch Logs

通过应力波测试仪对健康的杨树和落叶松原木试件进行检测试验,研究应力波在这2种原木试件中径向、弦向和纵向(原木心材和边材)传播速度之间的关系以及径向传播速度和直径、弦向传播速度和检测角之间的相关关系。结果表明:在这2种树种中,应力波径向传播速度和原木直径呈正相关,原木纵向边材传播速度比相应心材中的要大,弦向传播速度与检测角呈现二次函数关系。通过试验分析得出应力波在原木纵向心材和边材传播速度与径向传播速度比的域值。

The experiments to poplar and larch logs samplings were done by using stress wave testing instrument.The relationships among radial,tangential and longitudinal（heartwood and sapwood） propagation velocity of stress wave in the two logs samplings were studied.Meanwhile the relations were analyzed between radial velocity and diameter,as well as tangential velocity and the detection angles.The results indicated that,in the both species,the radial velocity of stress wave had positive correlation with the diameter,and that the longitudinal propagation velocity in the sapwood was larger than that in the corresponding heartwood,and that tangential velocity had a quadratic function relation with the detection angle.In addition,the paper showed the ratio thresholds between longitudinal velocity in heartwood and sapwood and radial speed separately.