飞机球面框型材拉弯回弹有限元模拟技术
Finite Element Simulation of Springback in Stretch Bending for Aircraft Spherical Frame Profile
杨润强 1王永军 1刘天骄 1王顺红 2王健 2王伟2
作者信息
- 1. 西北工业大学陕西省数字化制造工程技术研究中心
- 2. 中航飞机西安飞机分公司
- 折叠
摘要
针对飞机球面框型材为异形截面的几何特点,基于有限元分析软件Abaqus建立了等效填充离散芯模拉弯成形的有限元模型,通过合理定义边界条件及填充芯模的材料模型,提高了建模效率.根据拉弯过程型材截面弯曲中性层位置不变的假设,建立了夹钳轨迹计算模型,采用位移控制模式对飞机球面框型材拉弯回弹进行了有限元模拟,通过改变中性层位置调整有限元模拟的夹钳轨迹,模拟的回弹结果与实验结果一致,验证了建模方法的有效性.
Abstract
For the irregular section feature of aircraft spherical frame profile,a equivalence method for applying discrete internal supports in stretch bending process was established by using FEM software Abaqus.Through defining the load boundary conditions and the material model of support,the modeling and simulation efficiency was increased.The jaw trajectory calculation model was built according to the assumption that the bending neutral layer position unchanged in stretch bending process.The FEM model of aircraft spherical frame profile stretch bending process which controlled by the displacement of machine' s jaws was analyzed.By changing the position of the neutral layer to adjust the jaw' s trajectory of finite element simulation,the numerical result compared well with experiments.It is proved that the modeling method is effective for studying the springback of profile applying discrete internal supports in stretch bending process.
关键词
型材拉弯/回弹/填充芯模/有限元/7075铝合金Key words
stretch bending/springback/internal support/finite element method/7075 aluminium alloy引用本文复制引用
出版年
2014
NETL
NSTL
维普
万方数据