实体膨胀管膨胀工具优化分析

为了使膨胀管技术在国内得到大范围应用,采用三维弹塑性接触问题有限元法着重研究膨胀工具的锥角、定径长在膨胀过程中变形力以及残余应力的变化规律。采用ANSYS10.0建立膨胀管模型以及膨胀锥三维实体模型,单元类型选择Solid95,网格划分采用映射网格。研究结果表明,在膨胀锥锥角保持不变的情况下,膨胀锥定径长对膨胀后套管的残余应力没有太大影响,但对套管膨胀所需要的膨胀力有较大影响;膨胀锥锥角对套管最大残余应力没有影响,但对膨胀力的影响十分明显,当膨胀力的径向分力大于材料的抗拉强度时,材料将发生破坏。

An analysis of the computerized optimization of the expansion tool for solid expansion tube

To ensure an extensive application of the expansion tube technology in China,the finite element method was applied tostudy the influence of the expansion tool's cone angle and sizing length on the deformation force and residual stress of the expansion tube in the process of expansion.The ANSYS 10.0 was adopted to establish the model of expansion tube and the three-dimension solid model of expansion cone.The Solid95 was chosen as the element type,and the mapped meshing was adopted to generate grids.The results show that,with the expansion cone angle remaining unchanged,the sizing length of expansion cone does not have much effect on the residual stress of casing after expansion,but it has much effect on the expansion force required by tube expansion.The expansion cone angle has no effect on the maximum residual stress of casing,but it has remarkable effect on expansion force.When the radial component force of expansion force is greater than the material's tensile strength,the damage to the material will arise.