2219铝合金薄壁曲面拉伸件的变形与强化规律

In order to investigate the deformation and strength distribution of thin-walled 2219 aluminum alloy curved parts in stretch forming, grid strain analysis and uniaxial tensile tests were used to test the strain and mechanical properties of the curved part in every sub-region. Then the deformation and strength distribution in the whole area were obtained. The results show that the equivalent strain ranges from 1% to 15% in the whole area, but the equivalent strain in the effective central zone of the curved part ranges from 7% to 12%, which is relatively uniform deformation. Moreover, the yield strength in the effective central zone ranges from 312.8 to 346.9 MPa, while the tensile strength ranges from 421 to 442.2 MPa. The strength is directly proportional to the amount of deformation, and both the tensile strength and hardness increase with the increase of deformation. All the testing data of the gore show greater than expected mechanical properties of the stretch formed 2219 aluminum alloy curved parts used for dome of rocket tank.