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首页> 外文会议>International symposium on nondestructive testing of wood >Ultrasonic Measurement of Applied Stresses in Wood by Acoustoelastic Birefringent Method
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Ultrasonic Measurement of Applied Stresses in Wood by Acoustoelastic Birefringent Method

机译：震动双折射法通过施加木材施加应力的超声波测量

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The velocity changes of ultrasonic shear waves propagating transverse to the direction of the applied stress in wood were investigated experimentally. Their direction of oscillation was parallel and normal to the direction of uniaxially applied stress. Additionally, bending stress distributions in wood beam specimen were estimated by measuring ultrasonic shear wave velocities, that is, by the acoustoelastic birefringent method. The investigation showed that the ultrasonic waves changed speed a little due to the applied stress and the velocity of the shear waves propagating transverse to the direction of the stress was dependent on whether its direction of oscillation was parallel or normal to the direction of the stress. The relative differences of the ultrasonic velocities were given as functions of applied stress and the acoustoelastic constants for texture- and stress-induced birefringences were obtained. By using these constants and ultrasonic velocities of shear waves polarized parallel and normal to the direction of principal stresses, the difference of the principal stresses can be obtained and this is called the acoustoelastic birefringent method for the determination of the stress states. According to this acoustoelastic technique, bending stress distributions in wood beam specimen were tried to determine, and the stress states estimated agreed well with the stress values obtained by strain gauge method and mechanical calculation. The acoustoelastic birefringent phenomena can be applied to determine stress conditions of wood.
机译：实验研究了横向于木材中施加应力方向传播的超声剪切波的速度变化。它们的振荡方向是平行的，正常呈正常，对单轴施加的应力方向。另外，通过测量超声剪切波速度估计木梁样本中的弯曲应力分布，即通过声弹性双折射方法。该研究表明，由于施加的应力，超声波改变了速度一点，并且横向于应力方向传播的剪切波的速度取决于其振荡方向是否是平行的或正常的应力方向。提供超声速度的相对差异作为施加应力的函数，并且获得了用于质地和应力诱导的双射流的声弹性常数。通过使用这些常量和超声波速度的剪切波偏振，并正常地偏离主应力的方向，可以获得主应力的差异，这被称为用于测定应力状态的声弹性双折射方法。根据这种声弹性技术，试图确定木梁样本中的弯曲应力分布，并且应变计法获得的应力值和机械计算获得的应力状态很好地估计。散声双折射现象可以应用于确定木材的压力条件。

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