Research On Design Method Of Tailor Rolled Blank Based On Topology Optimization

The lightweight is an important approach to energy conservation and environmental protection.Topology optimization method and variable thickness rolling technology is an effective way to realize lightweight.On the one hand,the research work of the topological optimization method on sheet metal structure is relatively scarce.On the other hand,the research on the design method of TRB is not mature,which is not enough to fully release the potential of its lightweight.In this regard,this research makes an in-depth study on how to design TRB by means of topology optimization.It aims to improve the TRB's lightweight potential.This paper presents a topology optimization method for designing TRB structures.Based on the stiffness problem,the design method of topology optimization for continuous variable thickness structure is studied.And then the design method of TRB is extended to nonlinear condition.It,oriented by energy absorption,deepens research on nonlinear topology optimization for structural design of TRB.The specific work is as follows:It utilizes element thickness interpolation model instead of material interpolation model and confines the sensitivity along the rolling direction of TRB.During this process,it also gives consideration to the manufacturability of TRB.It therefore improves filtering method through topology optimization because it slows down drastic changes of thickness.Moreover,samples of 2D indicate that it is possible to design TRB via topology optimization.It based on the combination of topology optimization and TRB,studies stiffness in linear elastic stage.It interpolate value in shell element in order to get the sensitivity of linear stiffness with small deformation based on thickness interpolation;to verify the feasibility of this design by means of shell problem-Semi-circular roof;to design stiffness of TRB according to vertical sag condition of the vehicle door and the result indicates that its stiffness has been averagely improved about 40%compared with the uniformed quality.It,based on the study of stiffness of linear plate-shell,continues to research on crashworthiness.It obtains sensitivity,oriented by energy absorption,in shell element thickness interpolation.In order to verify the feasibility of the method,the TRB design of top-hat beam similar to B column in automobile is studied.In order to ensure the accuracy of the optimization,three point bending simulation and B column experiments were carried out.And then uses the method proposed in this paper to design the automobile B column with TRB structure.In order to further illustrate the practicability of the TRB design method,the optimal design of automobile bumper was carried out.The results show that with the same mass,the energy absorption performance of the optimized B column and automobile bumper is improved by about 30%.