| METALS AND METAL MATRIX COMPOSITES |
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| Prediction of Deformation Localization of Copper Foil Compound Forming Rolling Using Crystal Plasticity Finite Element Simulations |
| CHEN Shoudong1,2,3,*, CHEN Jingqi2, LI Jie1,3, SUN Jian1,3, LU Rihuan4
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1 School of Mechanical Engineering, Tongling University, Tongling 244061, Anhui, China
2 State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110819, China
3 Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes, Tongling University, Tongling 244061, Anhui, China
4 National Engineering Research Center for Equipment and Technology of Cold Rolled Strip, Yanshan University, Qinhuangdao 066004, Hebei, China |
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Abstract With the further thinning of the foil thickness, the anisotropy and localization of the foil rolling are completely different from the deformation characteristics of the rolled thick strip due to the size effect and deformation degree of the smaller thickness/grain size. The applicants have conducted the copper ultra-thin strip fabricating research recently with the use of a mini asynchronous rolling mill which has the function of carrying out the compound forming with tension, compression and shearing. The experiment results show that the compound forming process and the ratio of foil thickness and grain size significantly influence the mechanical properties and foils quality. Macro mechanicals finite element modelling cannot be used to simulate such new phenomena encountered in foil rolling process. In this work, plastic deforming localization of copper foil compound forming rolling was characterized by meso-scale crystal plasticity finite element(CPFE)simulations. Initial grain orientation and grain morphology determined from experiments were incorporated into a single-layer crystal microstructure generated by grain growth model. This work can be optimization of foil rolling process and improve the foil quality. CPFE simulations using such a grain-scale modelling accurately capture local deformation behaviors and evolution of foil rolling. The predicted roll force-time agrees well with experimental results, especially in regard to anisotropic behavior. With increase in the rolling speed ratio between the upper and lower rolls driving strong shear deformation along foil thickness direction, deformation and slip bands are formed and the localization trend is enhanced. Remarkable variations of plastic deformation localization occur in grains, making it difficult to control the shape and properties of copper foils in compound forming rolling process.
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Published:
Online: 2023-02-08
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| Fund:National Natural Science Foundation of China (51804219, 52005432), the Provincial Natural Science Foundation of Anhui Province (1808085QE161), the Provincial Key Research and Development Project of Anhui Province (202004a05020011), the Excellent Young Talent Program in University of Anhui Province (gxyq2022093), the Excellent Youth Research Project in University of Anhui Province (2022AH030153) and the Key Cultivation Project of Tongling University (2020tlxyxs33). |
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Corresponding Authors:
csdong0910@sina.com
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2023, Vol. 37 
