Study on Formability Enhancements and Springback Reduction Effects of Aluminum Alloys under High Strain Rate
Aiming at the problems of ruptures due to low formability and dimensional deviations due to large rebound of complex thin-walled components of high-strength and lightweight materials during room temperature forming,2024 aluminum alloy which was widely used in the aerospace field,was used as the object of the study,and the unidirectional tensile tests were carried out respectively at low and high strain rates to investigate the effects of strain rate on the plasticity of 2024 aluminum al-loys.By comparing and analyzing the bending forming of sheet at different angles under traditional stamping,high-speed stamping and impact hydroforming,the study decoupled into the effects of high strain rate and liquid medium on sheet springback.The results suggest that under high strain rate loading,the 2024 aluminum alloys demonstrate a significant enhancement in formability,with a maxi-mum elongation increase of up to 112.92％.Under the impact hydroforming mode,which combined the characteristics of high-strain-rate and liquid medium loading,the 2024 aluminum alloys exhibit a significant reduction in springback,with a maximum reduction in springback angle of up to 110.25％,even leading to a negative springback phenomenon.
万方数据
维普
