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The residual stress of the cold - formed thin-walled steel is caused due to the plastic deformation of the member in the production and manufacturing process , the the member yet withstand the external force before exist in the internal structure of a the initial autocorrelation counterweight Department . The presence of residual stress in the structure under load residual stress and load stress superposition , affect the performance of the structure . In this paper, the method of electrochemical corrosion , not only to learn from the experience of some scholars , also made ??the appropriate improvements . From the manufacture of cutting tools , the ratio of the etching solution , the protective layer of material selection and production process do explore the formation of a reliable and stable way ; 3.0mm, 3.5mm, 4.5mm , 5.0mm thick , 10 equilateral angle measured , the measured value of the longitudinal residual stress ; according to the characteristics of sheet metal forming , molding process is divided into bending and rebound , elastic-plastic theory analysis of the bending process to analyze springback process arc beam bending moments with rebound the superposition of the stress generated by the two processes , the residual stress in the molding process , theoretical analysis shows that factors affecting the longitudinal residual stress relative bending radius and thickness , relative bending radius of impact than the thickness ; finite element software ANSYS analog, the value of the simulated value and the measuring point at the comparison, the simulation results with the test results obtained to verify the correctness of the simulation method ; final use of this method to simulate , were simulated thickness of 2mm , 3mm, 4mm, 5mm , 6mm 8mm equilateral angle , the thickness of each test piece is taken relative radius of 2,3,4,5,6 , one each , to obtain the maximum value of the longitudinal residual stresses of the inner and outer surfaces ; combined with the results of simulation and theoretical analysis , and the theory and the error between the simulation analysis, proposed a outer maximum longitudinal residual stress in the thickness and the edge angle relative to the radius calculation approximate calculation formula according to the relative radius and thickness of two factors affect the residual stress .
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