| In the new era,Cu/Al layered metal composite plates can effectively integrate the benefits of copper’s superior electrical conductivity and high thermal efficiency with the benefits of aluminum alloy’s cost-effectiveness,lightweight,and strong surface resistance to corrosion,without compromising the original qualities of each metal.The Cu/Al layered metal composite plates can effectively merge the benefits of copper’s excellent electrical conductivity and high thermal conductivity efficiency with those of aluminum alloy’s affordability,lightweight nature,and superior surface corrosion resistance.They have been widely used in many fields,and the straightening process is an extremely important part of the production and use process of bimetal layered composite plates.The CPFEM is a novel simulation approach that considers the grain orientation in the material,resulting in a more accurate simulation of the material’s deformation process.Based on the CPFEM,the straightening process of bimetal laminated composite plates was studied in order to improve the bonding performance and straightening accuracy of the straightened parts.The research work in this article has made some progress as follows:Firstly,based on the mathematical method of VORONOI diagram and MATLAB software,a crystal plastic polycrystalline model with basic grain appearance is established to divide the grain set.Secondly,the simulation of uniaxial tension compression and plane strain compression involves the utilization of the UMAT that is founded on the crystal plastic constitutive model with a rate dependency,and the stress and strain of the simulation results,as well as the shear stress and cumulative shear strain of different grains,are analyzed,verifying the reliability of the crystal plastic finite element simulation.Thirdly,in the straightening process of copper aluminum composite plates,a crystal plastic polycrystalline model was established for the straightening unit of bimetal composite plates to simulate.The equivalent stress distribution of the simulation results,the fractional shear stress and cumulative shear strain of different grains,and the activation of different slip systems were analyzed in detail.Finally,the correctness of the theoretical calculation of the reduction was verified by using the eleven roller straightening experiment and a single straightening unit experiment.Through the analysis of the experimental force,displacement,and flatness of the plate,a comparative analysis was conducted with the simulation results.The results showed that using the crystal plastic finite element method can better reflect the three-dimensional deformation mechanism of the composite plate,especially the bonding interface. |
