应力波传播模型及其在木材检测中的应用

Stress Wave Propagation Modeling and Application in Wood Testing

木材无损检测技术是充分有效利用木材资源的重要手段之一。依据各向同性和各向异性材料中的机械波传播理论,研究了应力波在木材中的传播过程。分析了直角坐标系下的应力波传播方程,研究了木材中应力波传播的弹性常数之间的关系。在圆柱极坐标下研究了传播模型,对模型的参数进行了分析,用幂级数的形式给出模型的部分解,分析了木材中横向传播速度。最后对两类木材中的应力波传播进行了计算。

Wood nondestructive testing technology plays an important role in the utilization of wood resources effectively. According to the theory of mechanical wave transmitting in isotropic and anisotropic material, the stress wave propagation in wood was studied. The differential equations of stress wave propagation were analyzed in rectangular coordinate system. The relationship among the elasticity constants of stress wave propagation in wood was given. The parameters and possible solutions of the model were studied with the power series. The radial transmitting velocity in wood was analyzed, and two woods were used as examples to simulate the stress wave propagation.