船舶轻量化T型连接结构设计及强度试验

Design and strength test of lightweight T joints for ships

文章从船舶轻量化的角度出发,提出了一种由复合材料夹芯板和增强泡沫胶接而成的新型T型连接结构,解决了船舶复合材料上层建筑内部壁板之间的连接问题。基于复合材料结构的设计原理和力学特性,设计了T型连接结构的拉伸试验和压缩试验,研究其在不同载况下的极限承载和损伤模式,证明T型连接损伤模式复杂,抗拉能力弱,尤其面板与腹板连接区的胶层是承载薄弱环节;依据试验结果验证数值计算方法,并规划3条技术路径以研究T型连接的抗拉特性,应用数值方法提取对应技术路径的应力和位移特征量,分析T型连接面板与腹板连接区的胶层几何参数对抗拉强度和重量的响应规律,获得连接区胶层几何夹角的建议取值为45°~60°,为复合材料船舶轻量化胶接结构的优化设计和实际应用提供了有益参考。

In the view of ship lightweight,a new T joint consisting of composite sandwich plates,reinforced cores and adhesive was proposed,to solve the connection problem between bulkheads and decks of composite lightweight superstructure for ships.Based on the design principles and mechanical properties of composite structures,the tension and compression tests were investigated.And the ultimate bearing capacity and damage modes under different load conditions were examined,which proved that the compression strength is better than tension strength;especially the adhesive resin between the face plate and the web plate is weak spot.Based on the experimental results,a numerical method was verified and three characteristic paths were set;their stress and displacement were calculated by the numerical method.Then,the change rules among geometric parameters,tension strength and weight were summarized.Finally,the preferred range of angle at adhesive bond area is between 450and 60°,which supports the optimization design and practical application of ship lightweight adhesive bonded joints.