TA1钛合金板异质粘接-自冲铆复合接头力学性能研究

Investigation on Mechanical Properties of Adhensive Bonded-SPR Composite Joints in Dissimilar Sheets of TA1 Titanium Alloy

以TA1钛合金异质单搭粘接-自冲铆复合接头为研究对象,通过剖面直观检测法观察了接头成形质量。基于静力学实验对比了各组接头的静失效载荷及能量吸收性能,分析了各组接头失效模式。结果表明:三种粘接-自冲铆复合接头都具有良好的成形质量,其中TA1-5052复合接头钉脚张开度最大,铆钉刺入深度最深;TA1-Q215复合接头的静失效载荷最高,其能量吸收性能最优;三组接头胶层失效形式皆为基板与胶层粘接界面上的次价键被破坏,当上下板屈服强度差别较小时,接头失效形式为内锁破坏失效;反之,屈服强度较低的板断裂。

Taking TAI titanium alloy sheets dissimilar single-lap adhensive bonded-SPR composite joints as the research object, the forming quality of the joints was observed by the profile visual inspection method. The static failure load and energy absorption performance of each joint were compared based on the static test, and the failure modes of the joints were analyzed. The results show that： three kinds of adhensive bonded-SPR composite joints have good forming quality, expanding degree of the rivet of TA1-5052 composite joint is the largest, and the rivets pierce the deepest; the static failure load of TA1-Q215 composite joint is the highest, and its energy absorption performance is optimal; three groups of adhesive failure forms are that the secondary bonds of the interfacial bond between substrate and adhesive layer are destroyed, and when the difference of the yield strengths between the upper and lower sheets is smaller, the joint failure mode is internal lock failure; conversely, the sheet with lower yield strength breaks.