The mechanical behavior of adhesively-bonded timber joints, composed of a ductile acrylic or a brittle epoxy adhesive, was numerically modeled. The models took the strain rate sensitivity of the ductile adhesive into account. They were validated by experimental results presented in Part 1 of this paper. The effect of a varying joint displacement rate on the responses of the ductile joints was subsequently numerically studied. At the same joint displacement rate, the true strain rates in the acrylic adhesive layer varied significantly throughout the loading process and along the adhesive layer. Increasing the joint displacement rate shifted the load-displacement curve upwards, i.e. the yield load and displacement increased, the ultimate load and displacement however decreased, while the joint stiffness was not affected. A logarithmic relationship between these loads and displacements and the displacement rate was observed. The energy- and displacement-based ductility indexes of the acrylic joints decreased with increasing displacement rate, changing the joint behavior from ductile to brittle at higher rates.

数值模拟了由易延展的丙烯酸或脆性环氧胶粘剂组成的胶合木材接头的机械性能。这些模型考虑了韧性粘合剂的应变率敏感性。它们已通过本文第1部分中提供的实验结果进行了验证。随后数值研究了变化的关节位移速率对延性关节响应的影响。在相同的接头位移速率下，丙烯酸酯胶粘剂层中的真实应变率在整个加载过程中以及沿着胶粘剂层均发生显着变化。关节位移率的增加使载荷-位移曲线向上移动，即屈服载荷和位移增加，但最终载荷和位移却减小，而关节刚度却没有受到影响。观察到这些载荷和位移与位移速率之间的对数关系。丙烯酸酯类接头的基于能量和位移的延展性指数随着位移速率的增加而降低，从而在较高的速率下将接头行为从延性变为脆性。