Research On Key Technologies Of Deformation Calculation Of Steel Plate Induced Heating Based On Inherent Strain Method

Line heating plate process is a major forming method for hull curved plate forming.In recent years,a large number of scholars begin to study high frequency induction heating plate forming method based on line heating method.Thermal elastoplastic method is used in the study of induction heating deformation of steel plate,but the method is difficult to be used in the situation of induction heating with multiple heating lines.Therefore scholars present the inherent strain method.It is possible to make the rapid calculation of the deformation of steel plate by induction heating.Firstly,this paper uses commercial software ANSYS to simulate the moveable induction heating-process of the steel plate.The paper analyze the temperature and plastic strain mechanism of the plate.By measuring the temperature from the experiment.It shows that the numerical simulation results are similar to the experimental values.Next,the paper researches the inherent strain zone by the numerical simulation experiment.This paper obtains the distribution rules of the inherent strain zone and its characteristic parameters.Then the regression model between the heating parameters and the characteristic parameters of inherent strain zone is built by using the SPSS software.Additionally,this paper sets up 10 group simulation tests to verify the accuracy of the mathematical model.Meanwhile,this paper acquires the parameters of the inherent strain sizes of the inherent sizes of the sample by metallographic experiment for the steel sample.The geometrical sizes of the inherent strain zone of the sample are consistent by comparing the calculation results with experimental values.Finally,the study extracts the plastic strain value of the numerical simulation model,and the total values of the transverse and longitudinal inherent strain are calculated by the integration along with the transverse cross section of the plate.Inherent strain value is used in the elastic finite element model by using the temperature load methods.The calculation results of the elastic finite element model are reliable by comparison with the results of thermal elastic-plastic finite element method(FEM).