液压成形
波纹管
材料科学
残余应力
冯·米塞斯屈服准则
压力(语言学)
极限抗拉强度
图层(电子)
径向应力
有限元法
复合材料
结构工程
变形(气象学)
冶金
管(容器)
工程类
哲学
语言学
作者
Jian Lin,Xibo Wang,Yongping Liu,Jianchun Ding,Kangli Li,Fu Guo
标识
DOI:10.1016/j.jmapro.2021.10.021
摘要
Because large plastic deformation occurs in hydroforming bellows there is a residual stress distributing in the metal after forming, which is complex and not easy to be measured. The existence of residual stress might have an effect on the corrosive property and bulking performance of bellows. A finite element model was established to simulate the forming residual stress of the nickel alloy multi-layer bellow. The distribution of residual stress was calculated out and validated by cosα X-ray diffraction measurement. Thus the forming mechanics and the effects of layer number and forming pressure on the residual stress in the hydroforming bellow were both discussed in detail based on the established model. It was shown that the calculated residual stress had the same trend with the experimental results. The axial and circumferential residual stresses at the outer surface of the peak were both compressive. There existed the maximal Von Mises stress at the inner surface of the peak of the bellow. At this position the radial and axial residual stresses were both tensile. When applying multi-layer bellows and less forming pressure a lower forming residual stress could be obtained because of the narrow plastic strain region during forming.
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