预加热对TA1钛合金自冲铆接性能的影响

为探究温度对TA1钛合金自冲铆接性能的影响,在预加热条件下采用钛钛TA1+TA1、钛铝TA1+5052、铝钛5052+TA1这3种组合方式进行自冲铆接试验,对所得的接头进行静态拉伸试验,观察20,100和150℃这3种预加热温度下的接头成形截面和拉伸失效形式。结果表明:不同板料组合下的自冲铆接接头的成形截面不同,随着预加热温度升高,成形截面的底厚逐渐降低。在同一温度下,TA1+TA1接头的静强度最高,上板拉出而失效;TA1+5052接头次之,下板产生断裂失效;5052+TA1接头最低,上板产生断裂失效。随着预加热温度的升高,3种接头的静强度明显下降,但是失效形式不发生明显的变化;在能量吸收值方面,TA1+TA1接头的能量吸收值逐渐下降,TA1+5052、5052+TA1接头的能量吸收值逐渐上升。

Influence of preheating on properties of self-piercing riveting for TA1 titanium alloy

In order to explore the influence of temperature on the self-piercing riveting properties of TA1 titanium alloy,the self-piercing riveting test was conducted under the preheating condition by three combinations of titanium/titanium( TA1 + TA1),titanium/aluminum( TA1 + 5052) and aluminum/titanium( 5052 + TA1),and the forming sections and tensile failure forms of the joints under the three preheating temperatures of 20,100 and 150 ℃ were observed by the static tensile test on the joint. The results show that the forming sections of the self-piercing riveting joints are different under different sheet metal combinations,and the bottom thickness of the forming section decreases with the increasing of preheating temperature. At the same temperature,the static strength of TA1 + TA1 joint is the highest,and the upper sheet is pulled out and fails. TA1 + 5052 is the second,and the lower sheet is broken. 5052 + TA1 is the lowest,and the upper sheet is broken. With the increasing of preheating temperature,the static strength of the three joints decreases obviously,but the failure mode does not change significantly. However,in terms of energy absorption value,TA1 + TA1 joint decreases gradually,TA1 +5052 and 5052 + TA1 joint increases gradually.