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A nondestructive guided wave propagation method for the characterization of moisture-dependent viscoelastic properties of wood materials

机译：一种非破坏性导波传播方法，用于木材依赖性粘弹性特性

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The in-situ monitoring and characterization of the mechanical properties of wood and timber materials is of great importance due to their broad structural applications. The purpose of this study was to propose a nondestructive method to assess the moisture-dependent viscoelastic behavior of structural wood using the guided Lamb wave propagation. Twelve green poplar wood specimens with different moisture content (MC) underwent the Lamb wave propagation tests and the wave characteristics were acquired. The viscoelastic properties of the wood specimens, including the shear storage and shear loss moduli and the loss factor, were then estimated through the solution of the corresponding inverse Lamb wave propagation problem using the experimentally measured Lamb wave characteristics. The structural stiffness and damping of wood specimens were affected by their MC, as the Lamb wave amplitude and velocity significantly decreased with MC. While the shear storage modulus decreased with MC, the shear loss modulus and loss factor increased with MC, resulting in a higher viscoelastic behavior. The loss factor of the wood specimens was estimated to be between 5.88% and 8.49% for different classes of MC, showing an increase of 44% with MC. The Lamb wave propagation method offers a strong tool for nondestructive characterization of the viscoelastic properties of wood materials and structures over a broad MC range. Wood materials show a significant viscoelastic behavior which is highly impacted by their MC. The loss factor can play an important role in the characterization and classification of structural wood and timber with different MC.
机译：原位监测和表征木材和木材材料的机械性能由于其宽的结构应用，具有重要的重要性。本研究的目的是提出一种非破坏性方法，以利用引导羊羔波传播来评估结构木的依赖性粘弹性行为。具有不同水分含量（MC）的十二个绿色杨树木质标本经历了羊羔波传播测试，并获得了波特性。然后，通过使用实验测量的羊波特性，通过对应的逆羊波传播问题的溶解来估计木质样品的粘弹性，包括剪切储存和剪切损失模数和损耗因子。木质标本的结构刚度和阻尼受其MC的影响，因为羔羊波振幅和速度随MC显着降低。虽然剪切储存模量随MC而降低，但剪切损耗模量和损耗因子随MC增加，导致粘弹性较高。对于不同类别的MC估计，木材标本的损失因子估计为5.88％和8.49％，显示MC的增加44％。 LAMB波传播方法提供了一种强大的工具，用于木材材料的粘弹性特性和在宽的MC范围内的结构。木材材料显示出显着的粘弹性行为，受到了MC的强烈影响。损失因子可以在结构木材和木材的表征和分类中发挥重要作用，用不同的MC。

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