Increased sheet-forming capability via controlling in-plane stress state of the sheet metal using hetero-structured flexible dies.
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| Title: | Increased sheet-forming capability via controlling in-plane stress state of the sheet metal using hetero-structured flexible dies. |
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| Authors: | Xiang, Nan1 (AUTHOR) xiangnan-87@163.com, Huang, Tao1 (AUTHOR), Wang, Peng-yi2 (AUTHOR) wangpengyi@sust.edu.cn, Zheng, Li-huang3 (AUTHOR), Guo, Jun-qing1 (AUTHOR), Guo, Xiu-hua4 (AUTHOR), Chen, Fu-xiao1 (AUTHOR) |
| Source: | International Journal of Advanced Manufacturing Technology. May2022, Vol. 120 Issue 5/6, p3491-3506. 16p. |
| Subjects: | Sheet metal, Sheet metal work, Digital image correlation, Distribution (Probability theory), Radial stresses, Finite element method |
| Abstract: | Plastic deformation of the sheet metal occurs synchronously with elastic deformation of the elastomer in flexible die forming process using elastic die. Thus, adjusting elastic deformation state of the elastomer to adapt to stress state of the sheet metal may be a potential way to improve sheet-forming capability. In this work, various deformation modes of the flexible dies were established using elastomers with different structures, which aims at developing a new way to improve sheet-forming capability through controlling in-plane stress state of the sheet metal. Digital image correlation (DIC) technique was used to capture the displacement and strain field of the sheet metal in bulge tests. Finite element analysis (FEA) was conducted to obtain pressure field of the flexible die and in-plane stresses of the sheet metal. The results showed that forming load, bulged height, and bulge strain could be adjusted by using flexible dies with different structures. The sharp increase of normal pressure in local region at the flexible die/sheet interface leads to non-uniform distribution of radial and circumferential stresses of the sheet metal. A design strategy of flexible die with a hollow structure (i.e., type 6) was proposed to reduce localization of interfacial normal pressure. Due to evenly-distributed normal pressure and beneficial friction at the flexible die/sheet interface, radial and circumferential stresses subjected by the sheet metal were relieved effectively. And the consequent increase of bulge height and bulge strain indicates the improvement of sheet-forming capability. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Plastic deformation of the sheet metal occurs synchronously with elastic deformation of the elastomer in flexible die forming process using elastic die. Thus, adjusting elastic deformation state of the elastomer to adapt to stress state of the sheet metal may be a potential way to improve sheet-forming capability. In this work, various deformation modes of the flexible dies were established using elastomers with different structures, which aims at developing a new way to improve sheet-forming capability through controlling in-plane stress state of the sheet metal. Digital image correlation (DIC) technique was used to capture the displacement and strain field of the sheet metal in bulge tests. Finite element analysis (FEA) was conducted to obtain pressure field of the flexible die and in-plane stresses of the sheet metal. The results showed that forming load, bulged height, and bulge strain could be adjusted by using flexible dies with different structures. The sharp increase of normal pressure in local region at the flexible die/sheet interface leads to non-uniform distribution of radial and circumferential stresses of the sheet metal. A design strategy of flexible die with a hollow structure (i.e., type 6) was proposed to reduce localization of interfacial normal pressure. Due to evenly-distributed normal pressure and beneficial friction at the flexible die/sheet interface, radial and circumferential stresses subjected by the sheet metal were relieved effectively. And the consequent increase of bulge height and bulge strain indicates the improvement of sheet-forming capability. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 02683768 |
| DOI: | 10.1007/s00170-022-08940-8 |
