2219铝合金薄壁曲面拉伸件的变形与强化规律

为了研究拉伸成形2219铝合金薄壁曲面件的变形与强度分布规律,通过网格应变法和单向拉伸试验对曲面件各个区域的应变与力学性能进行测试,得到全域范围内的变形与强度分布规律。结果表明:等效应变分布在1%~15%范围,但瓜瓣曲面件有效区域的等效应变在7%~12%,变形较为均匀;屈服强度为312.8~346.9 MPa,抗拉强度为421~442.2 MPa;强度与变形量之间成正比例关系,抗拉强度和硬度皆随变形量增加而增大。所有测试数据表明拉伸成形的2219铝合金薄壁曲面件满足火箭燃料贮箱箱底的力学性能要求。

Deformation and strength distribution of stretch formed 2219 aluminum alloy thin-walled curved parts

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.