超声振动效应对TA2钛合金板材力学及胀形性能影响

Effect of Ultrasonic Vibration on Mechanical Properties of TA2 Titanium Alloy Sheet and Its Bulging Performance

摘要:

针对钛合金板材塑性变形能力差的问题,进行了超声振动辅助成形工艺的研究,分析超声振动对钛合金TA2板材力学性能及与接触面之间摩擦系数的影响。在此基础上进行了不同宽长比坯料的超声振动辅助胀形实验,分析超声振动对TA2板材胀形力、极限胀形高度的影响。同时,基于网格应变原理,通过不同宽长比坯料极限应变的测量,建立TA2板材的成形极限图。研究结果表明,选择合适的超声振动辅助成形工艺参数, 不仅可以提高TA2板材变形能力,还可以减小摩擦对板材成形性能的影响,从而有效提高了TA2板材的成形极限。

Abstract:

Aiming at the problem of poor formability of titanium alloy sheet, the ultrasonic vibration-assisted forming process was studied, the effects of ultrasonic vibration on the mechanical properties of TA2 titanium alloy sheet and the friction coefficient between the contact surfaces were analyzed. On this basis, the ultrasonic vibration-assisted bulging experiment of specimens with different width-to-length ratios was carried out, and the influence of ultrasonic vibration on the bulging force and limit bulging height of TA2 sheet were analyzed. At the same time, based on the grid strain principle, the forming limit diagram of the TA2 sheet was established by measuring the limit strain of the specimens with different width-to-length ratios. The research results show that choosing appropriate process parameters in ultrasonic vibration-assisted forming can not only improve the formability of TA2 sheet, but also reduce the influence of friction on plastic deformation behavior of sheet, thus effectively increasing the forming limit of TA2.