L型构件双圆棒榫节点抗弯强度模型及其数值模拟

为解决现有圆棒榫节点抗弯强度研究中试验偶然性的问题，采用有限元法，建立L型构件双圆棒榫节点抗弯强度模型，进行数值模拟，并通过相应的试验对模拟结果进行了验证。结果表明:1)所建立的有限元模型可用于实木榫接合家具设计中的抗弯强度预测，不同直径下有限元分析结果与试验结果平均误差均<15%，且圆棒榫变形情况与试验结果相符；2)双圆棒榫接合构件抗弯节点主要破坏形式为榫损伤，抗弯强度随直径增加而增加，但增幅减小；3)直径为10 mm的双圆棒榫可用于椅子腿部与望板接合部位，直径为8 mm的双圆棒榫可用于椅子腿与扶手连接处，性能满足GB 103547所规定的要求，直径为6 mm的双圆棒榫不适用于椅子连接。

Numerical Simulation Research on the Bending Strength of Double Dowel Joint

In order to solve the problem of accidental test in the research on the bending strength of dowels,through the finite element method,the bending strength model of L-shaped double dowel joints was established,and the experimental results were used to verify the model.The results showed that 1) the finite element model established in this research could be used to predict the bending strength.The error between the finite element analysis results and the experimental results was within 15%,and the deformation of dowel was consistent with the experiment.2) The main failure form was the dowel damage,the bending strength of the double dowel increased as the increase of diameter with reduced amplitude of increment.3) The double dowel with a diameter of 10 mm could be used for the joint between the chair leg and the viewing plate,the 8 mm size could be used for the connection of the chair armrest,and the 6 mm size was not suitable for the chair connection,and the performance requirements of GB 103547 was met with the 10 mm and 8 mm sizes.