Abstract

To closely examine the mechanical properties of mortise and tenon woodworking joinery in outdoor environments, it is essential to obtain fundamental data regarding the influence of moisture content and wood section on the frictional properties of wood surfaces. In this study, the static and dynamic friction coefficients under varying moisture contents (5, 8.50, 11.25, 20, 30, 40, 50, and 60%) and wood sections (tangential, diagonal, and radial) were measured. Moreover, the equation for the relationship between moisture content and friction coefficient was obtained and variations in friction coefficients caused by the effects of moisture content and wood section on roughness and hardness were analyzed. The results showed that moisture content and wood section had significant effects on the friction coefficient of beech wood. With increasing moisture content, the static and dynamic friction coefficients both increased, and the tangential section exhibited a higher friction coefficient than the diagonal and radial sections. Furthermore, with increasing moisture content, the ratio of the dynamic friction coefficient to the static friction coefficient showed an initial increasing trend and then gradually flattened due to the stick–slip effect, and the friction coefficient showed a segmented and positive growth trend in the moisture content range of 5–60%. Ultimately, it was found that higher moisture contents had a negative effect on frictional properties, leading to rougher wood surfaces and lower hardness, and roughness was linearly correlated with the friction coefficient. These findings can assist in making accurate calculations and optimizing the structural design of wood products.

摘要

要仔细检查户外环境中榫卯木工细木工制品的机械性能，必须获得有关水分含量和木材截面对木材表面摩擦性能影响的基本数据。在这项研究中，测量了不同水分含量（5、8.50、11.25、20、30、40、50 和 60%）和木材截面（切向、对角线和径向）下的静摩擦系数和动摩擦系数。此外，还得到了含水率与摩擦系数之间的关系方程，分析了含水率和木材断面对粗糙度和硬度的影响引起的摩擦系数变化。结果表明，含水率和木材断面对榉木的摩擦系数有显着影响。随着含水量的增加，静摩擦系数和动摩擦系数均增加，切向截面的摩擦系数高于对角截面和径向截面。此外，随着含水量的增加，动摩擦系数与静摩擦系数的比值呈现出初始增加的趋势，然后由于粘滑效应而逐渐变平，摩擦系数在含水量中呈分段的正增长趋势。含量范围为 5-60%。最终，发现较高的水分含量对摩擦性能有负面影响，导致木材表面更粗糙和硬度更低，粗糙度与摩擦系数呈线性相关。