Finite Element Analysis Of Aeronautical Thin Walled Parts’ Deformation

At present,the thin walled parts are widely used in aerospace manufacturing industry as frame,beam parts and so on,but its deformation problem has been a worldwide problem.In order to improve the machining quality and machining precision of the thin walled parts,it is very necessary to predict and analyze the parts’ deformation by using the finite element analysis method.In this paper,through the analysis of establishing prediction model of milling force and the machined surface residual stress,ABAQUS software is used to predict the deformation of flat plate type and entire part of thin walled parts.And the model was verified by experiments.The specific work is as follows:(1)Based on the milling force prediction model summarized by the domestic and foreign scholars,use the theoretical model of Altintas as the foundation,combined with the experimental parameters,determine the milling force of 7050-T7451 aviation aluminum alloy prediction model.And set up linear and polynomial coefficient model,then combining MATLAB simulation with experiment phase,as a result,to determine which coefficient model is more accurate.This result is a foundation for the milling force application on frame parts’ deformation analysis.(2)The residual stress of the parts is analyzed theoretically,and the finite element simulation method is used to make up the theoretical analysis.And through the selection of different cutting parameters,simulation of different processing conditions,cutting parameters and the distribution of the residual stress on the surface has been processed.It can provide theoretical basis for the further analysis of the deformation of parts.(3)The deformation of rectangular cantilever thin-walled parts is analyzed theoretically,and the process of milling thin-walled parts is simulated.After the milling process,the deformation along the length and width direction is outputted.According to the simulation process,the experiment process is carried out with the same size,and the accuracy of the simulation results is verified.(4)Based on the contents of the first three chapters,using the ’life and death unit,function of the ABAQUS software to simulate the milling process.During the process,exert the initial residual stress on the material,and in accordance with the second chapter,exert the milling force to nodes.This model can accurately reflect the actual process.With the same experimental parameters as the simulation process,the milling experiment was carried out,and the deformation data obtained from the simulation and the experimental results were compared and analyzed.