The aim of this study was to evaluate the structural performance of finger-joints made of Uruguayan Eucalyptus grandis and two types of adhesives. A numerical model for bending strength and stiffness prediction was developed. Model inputs were experimentally determined from tests on wooden specimens and from the literature. Finger-joints glued with two types of adhesives (one-component polyurethane -PUR- and emulsion polymer isocyanate-EPI-) were tested in bending and the failure modes were evaluated. Results show that adhesive type did not influence the stiffness of the finger-joint, but the bending strength. Specimens glued with PUR showed higher strength than those glued with EPI. A 3D model, using Comsol Multiphisic software, was developed to simulate the finger-joint behavior. Adhesive-wood interaction in the finger-joints was modelled using the Comsol Thin Elastic Layer module, defined by the elastic properties of the adhesives. The numerical results showed no differences on the stiffness of the joints regardless of adhesive type. Results agreed with those obtained from experimental tests, with a maximum error of 7%. Models predicted the bending strength with an error of 6% with respect to the experimental values. Different finger configurations were analysed, and the optimal geometry (20 mm-length, 6.2 mm-pitch and 1.0 mm-tip-thick) to attain the maximum strength for Uruguayan Eucalyptus was found.

这项研究的目的是评估由乌拉圭桉树制成的指关节的结构性能和两种胶粘剂。建立了用于预测弯曲强度和刚度的数值模型。模型输入是根据对木制样本的测试和文献确定的。测试了用两种类型的粘合剂（单组分聚氨酯-PUR-和乳液聚合物异氰酸酯-EPI-）粘合的指接的弯曲程度，并评估了其破坏模式。结果表明，胶粘剂类型不影响手指关节的刚度，但影响弯曲强度。用PUR粘合的样品比用EPI粘合的样品显示出更高的强度。使用Comsol Multiphisic软件开发了3D模型，以模拟手指关节的行为。使用Comsol薄弹性层模块对手指关节中的胶木相互作用进行建模，该模块由胶粘剂的弹性特性定义。数值结果表明，无论胶粘剂类型如何，接头的刚度都没有差异。结果与实验测试结果一致，最大误差为7％。模型预测的弯曲强度相对于实验值有6％的误差。分析了不同的手指配置，并找到了达到乌拉圭桉树最大强度的最佳几何形状（长20 mm，节距6.2 mm和尖端厚度1.0 mm）。