CFRP/Al四钉铆接接头性能研究

Research on Performance of CFRP/Al Four-Riveted Joint

碳纤维复合材料(CFRP)作为一种新型轻质材料,与金属的连接问题备受关注.本文设计了CFRP/Al四钉铆接接头试样结构,通过试验与仿真对比,观察单搭接接头和T型连接接头的失效形式、位移载荷曲线,验证接头三维累计损伤有限元模型的有效性.通过仿真比较不同接头尺寸对四钉接头力学性能的影响.结果表明,在一定范围内,铆钉直径越大,剥离强度越大,铆钉直径为5mm时,剪切强度最大;铆钉排距为25mm时,剪切强度最高,剥离强度会随着排距的增加而增大;铆钉列距越大,剥离强度越大,当列距为15mm时,剪切强度达到最大值.因此,铆接方式能够有效解决CFRP和铝合金的连接问题,并且选择合适的接头尺寸可以提升接头的力学性能.

The carbon fiber reinforced composite(CFRP),as a new type of lightweight material,has got a lot of attention in its connection with metal.To analyze the performance of joint,a sample structure of CFRP/Al four-riveted joint was designed firstly.Then,a comparison of experiment and simulation was carried out to find out failure forms and displacement-load curves of single-lap joint and T-joint,and to validate the effectiveness of a 3D progressive damage finite element model.And the effects of different joint sizes on mechanical properties of four-rivet joint were compared with simulation.The results show that the shear strength is largest when the rivet diameter is 5 mm,and the peel strength is greater the larger diameter of the rivet.When the rivet row pitch is 25 mm,the shear strength is the largest,and the peel strength increases with the row pitch.When the array pitch is 15 mm,the shear strength reaches a maximum,and the peel strength increases with the array pitch.Therefore,the rivet joint can effectively solve the connection problem between the CFRP and the aluminum alloy,and selecting the proper joint size can improve the mechanical properties of the joint.