The shear moduli of solid wood in longitudinal–tangential and longitudinal–radial planes were obtained by conducting a torsional vibration test and subsequent numerical analyses on western hemlock specimens by fixing the thickness as 10 mm and varying the width and length in the ranges of 20–80 mm and 100–400 mm, respectively. In the numerical analyses, the shear modulus in the tangential–radial planes was varied, and its effect was also examined as well as those of the width and length of the model. The results obtained indicated that the effect of the shear modulus in the tangential–radial plane was enhanced as the width increased and the length decreased. However, the shear modulus in the wider plane of the specimen could be obtained accurately by reducing the effect of the shear modulus in the tangential–radial plane when appropriate ranges of the width and length were determined. From the numerical and experimental results, the shear moduli in the longitudinal–tangential and longitudinal–tangential planes were accurately obtained when the width was in the range of 20–40 mm and the length was in the range of 250–400 mm.

中文翻译：

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试件配置对西铁杉扭振试验剪切模量测量精度的影响

通过对西铁杉试样进行扭转振动试验和随后的数值分析，将厚度固定为 10 毫米，并在 20 到 20 的范围内改变宽度和长度，获得了实木在纵向 - 切向和纵向 - 径向平面的剪切模量。分别为 80 毫米和 100-400 毫米。在数值分析中，切向-径向平面中的剪切模量是变化的，并且还检查了其影响以及模型宽度和长度的影响。结果表明，切向-径向平面中剪切模量的影响随着宽度的增加和长度的减少而增强。然而，当确定合适的宽度和长度范围时，通过减小切向-径向平面中剪切模量的影响，可以准确地获得试样较宽平面中的剪切模量。从数值和实验结果来看，当宽度在20-40 mm范围内，长度在250-400 mm范围内时，可以准确地获得纵切面和纵切面的剪切模量。