木质基点阵夹层结构连接方式的优化

Optimization of Connection Method of Wood-based Lattice Sandwich Structure

木质基点阵夹芯结构由于其材质的限制,常采取开槽粘接的方式来制造,这种方式破坏了面板的完整性。为了保证面板的完整性,本研究设计了一种新的连接方式,通过桦木方块连接桦木圆棒榫和杨木单板。与开槽粘接的连接方式对比,芯层在加上桦木方块后增强了芯层力传递的效率,这在平面外压缩和短梁剪切上得到体现。随着位移的增加,加入桦木方块的配置出现相对稳定的力学行为,增长了结构失效后的应急时间。试验分析了失效原因并与其他竞争模式做了对比,比强度优于部分合金和碳纤维制备的点阵夹芯结构。理论分析和试验结果一致性良好,具有成本低、环境友好等特点。

Wood-based lattice sandwich structures have material limitations and thus are often manufactured by the slotting and adhesive bonding approach,which destroys the integrity of the panel.In order to ensure the integrity of the panel,this paper designed a new connection for the lattice sandwich structure.Birch round sticks and poplar veneers were joined through a birch block.The integrity of the panel was ensured by the novel connection.In contrast to the slotting and adhesive bonding connection,the force transfer of the core layer following the additional birch block increased.This manifested through out-of-plane compressions and short beam shears.As the displacement increased,the configuration of the added birch block had a relatively stable mechanical behavior,which increased the emergency time after the structural failure.The causes of the failure were analyzed and compared with other competition modes.The specific strength was better than some lattice sandwich structures composed of alloys and carbon fibers.The theoretical analysis and experimental results were in good agreement.The novel connection was characterized by its low cost and environmental friendliness.