天然桦木和压缩桦木的内摩擦研究

Aleksandr Russu, Vladimir Shamaev, Egor Razinkov, Andris Zimelis
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引用次数: 0

摘要

提出了一种基于玻尔兹曼叠加原理的近似木材内摩擦的方法,该方法通过分量的线性组合来描述系统的复杂粘弹性行为。从Khlevensky森林(52.184130,39.110463,ASL 157m)生长的下垂桦树(Betula pendula ROTH)的树干部分锯下的天然木材和改性木材的制备样品,在径向和切向上暴露于超声波(频率24.5 kHz,暴露0- 20分钟,步骤5分钟)和脉冲磁场(强度- 0.3 T,暴露0-2分钟,步骤0.5分钟)。然后,利用基于自由弯曲振动的对数阻尼减量,在实验装置上研究了样品的内摩擦。模型中作为主要结构参数的无量纲粘度系数κ的绝对值对于天然木材和改性木材的样品,其显著性水平为p=0.95:对于含水率在4.3 ~ 15之间;超声4.6 ~ 20;对于3.6到7.7的脉冲磁场。天然和改性木材样品的无量纲标度因子μ的绝对值在1.92 ~ 3.91之间。在检测天然白桦(Betula pendula ROTH)木材样品时,得到了最高的近似值:径向湿度因子的影响R2=0.98,切向超声波因子的影响R2=0.85,而改性木牌“Destam”样品在径向脉冲磁场因子的影响R2=0.96。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Internal friction investigation of the natural and compressed birch (Betula pendula Roth) wood
A method is proposed for approximating of the internal friction of wood based on the Boltzmann superposition principle, which describes the complex viscoelastic behavior of the system by a linear combination of components. Prepared samples of natural and modified wood, sawn from the stem part of drooping birch (Betula pendula ROTH) trees growing in the Khlevensky Forestry (52.184130, 39.110463, ASL 157m), were exposed to radial and tangential directions with ultrasound (frequency 24.5 kHz, exposure 0 -20 minutes, step 5 minutes) and pulsed magnetic field (strength - 0.3 T, exposure 0-2 minutes, step 0.5 minutes). Next, the internal friction of the samples was studied on an experimental setup using the logarithmic damping decrement based on free-bending vibrations. The absolute values of the dimensionless viscosity coefficient κ included in the model as the main structural parameter for samples of natural and modified wood were obtained at a significance level of p=0.95: for moisture content from 4.3 to 15; for ultrasound 4.6 to 20; for a pulsed magnetic field from 3.6 to 7.7. The absolute values of the dimensionless scaling factors μ for natural and modified wood samples range from 1.92 to 3.91. The highest approximation value was achieved when testing natural wood samples of silver birch (Betula pendula ROTH): R2=0.98 for the radial direction, the influence of the humidity factor, and R2=0.85 for the tangential direction, the influence of the ultrasonic factor, as well as for a sample of modified wood brand "Destam" in the radial direction R2=0.96, the influence of the factor of the pulsed magnetic field.
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