Research on Reverse Deformation Compensation of Thin-Walled Parts Formed by Selective Laser Melting Based on Finite Element Simulation
The equivalent stress field and deformation field of GH4169 nickel-based superalloy thin-walled cylinder with thickness of 1 mm formed by selective laser melting were simulated by finite element method.Reverse deformation compensation was performed on the finite element model with different interation times,and the influence of iteration times on the deformation field was studied.And the test was carried out to verify.The results show that the deformation of thin-walled cylinder samples decreased in the middle,bottom and top successively,and the equivalent stress decreased in the bottom,middle and top successively.When the height was 90 mm,the deformation was the largest and the equivalent stress was the smallest,which were about 0.485 mm and 341 MPa respectively.The relative error between deformation obtained by test and the simulation value was less than 10%,accounting that the deformation field of the finite element model could be used as the basis for the calculation of reverse deformation compensation.With the increase of reverse deformation compensation iterations,the deformation of the finite element model gradually approached to 0,The model after two iterations was derived and then formed by selective laser melting,and the deformation of the thin-walled cylinde was within±200 µm,which was 60%lower than that before reverse deformation compensation.
万方数据
维普
