杨木径切面准纵波传播路径追踪及速度变化试验研究

Experiment study on the propagation path tracing and velocity change of quasi-P wave in the radial section of poplar wood

为了研究准纵波在木材中的传播规律,测试并模拟了准纵波在完好杨木径切而的传播轨迹,分析了木材各向异性对准纵波速度的影响。首先将径切面离散网格化,测试准纵波在径切面内的传播时间,绘制传播时间等值线;然后对比木材纵向、径向以及心材、边材中准纵波速度差异,探讨纹理角与速度之间的关系;最后采用二次抛物线模型和Hankinson公式对径切面内准纵波速度进行预测,对两个模型进行比较和校验。研究结果表明,木材的各向异性对准纵波传播轨迹及速度都有显著影响,准纵波在木材纵向传播速度大大高于径向传播速度。

In order to understand the propagation rule of quasi-P wave in wood, the effects of wood anisotropy on the propagation velocity and the traveling path of quasi-P wave in the radial section of poplar wood were discussed in this study. Firstly, a series of grids were drawn on the radial section, in which the transmitting time of quasi-P wave was tested and used to simulate the isolines. Then, the velocities of quasi-P wave in different direction of wood were compared and the relationship between wood grain angle and propagation velocities was discussed. Finally, the second order parabolic model and Hankinson formula were employed to predict the quasi-P wave velocities. The results show that wood anisotropy has significant effects on both the velocity and traveling path of quasi-P wave, and the velocities in longitudinal are much higher than that in radial.