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首页> 外文会议>International Symposium on Nondestructive Testing of Wood; 20000913-20000915; Sopron; HU >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：声弹性双折射法超声测量木材中的施加应力

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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：实验研究了垂直于木材应力方向传播的超声波剪切波的速度变化。它们的振荡方向平行于并且垂直于单轴施加应力的方向。另外，通过测量超声剪切波的速度，即通过声弹性双折射方法，估计了木梁试样中的弯曲应力分布。研究表明，超声波由于施加的应力而略有变化，并且横切应力方向传播的剪切波的速度取决于其振荡方向是平行于应力方向还是垂直于应力方向。给出了超声波速度的相对差异，作为施加应力的函数，并获得了纹理和应力引起的双折射的声弹常数。通过使用这些常数和平行于且垂直于主应力方向极化的剪切波的超声速度，可以获得主应力的差，这被称为用于确定应力状态的声弹性双折射方法。根据这种声弹技术，试图确定木梁试件的弯曲应力分布，估计的应力状态与通过应变仪方法和机械计算获得的应力值吻合得很好。声弹性双折射现象可用于确定木材的应力条件。

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