### 基于三维数字图像相关法的管材胀形试验

1. 1. 北京航空航天大学 能源与动力工程学院, 北京 100191;
2. 北京航空航天大学 机械工程及自动化学院, 北京 100191
• 收稿日期:2021-06-21 修回日期:2021-07-26 发布日期:2023-01-03
• 通讯作者: 邹正平,E-mail:zouzhengping@buaa.edu.cn E-mail:zouzhengping@buaa.edu.cn
• 基金资助:
国家自然科学基金（516750291005167）；四川省省院省校合作项目（2019YFSY0034）

### Tube bulging test based on 3D digital image correlation method

ZOU Zhengping1, ZHANG Meng1, LANG Lihui2

1. 1. School of Energy and Power Engineering, Beihang University, Beijing 100191, China;
2. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
• Received:2021-06-21 Revised:2021-07-26 Published:2023-01-03
• Supported by:
National Natural Science Foundation of China (516750291005167); Sichuan Science and Technology Plan Project (2019YFSY0034)

Abstract: The constitutive equation and the forming limit diagram are effective means for evaluating the deformability and formability of the metal material. Compared with the traditional tube mechanical properties test, the Tube Bulging Test (TBT) can be used to get more accurate constitutive equation and forming limit of the tube under the action of fluid force. To overcome the problems of mesh distortion and difficulty in axial profile measurement with the traditional method, the 3D Digital Image Correlation method (3D-DIC) was used to obtain and reconstruct the bulging contour of the 5A02 aluminum alloy tube. A mechanical model of the free bulging region of the tube was established, a calculation formula of wall thickness distribution in the bulging region of the tube was given, and the constitutive equation of the alloy was obtained. The results were compared and verified by the finite element method. It is found that the maximum relative error of the power exponential constitutive equation is less than 10%, the maximum relative error of the contour is less than 1.5%, and the maximum relative error of the wall thickness is less than 2%. Finally, the left Forming Limit Curve (FLC) of the tube was obtained by controlling the aspect ratio of the free area.