Finite Element Simulation And Experimental Study On The Rear Bumper Of A Passenger Car

Nowadays consumers’ demands for the quality of passenger car bumper are higher and higher,and the replacement of bumper is becoming more and more rapid.Finite element analysis(FEA)technology is an important branch of computer aided engineering(CAE),which can be used in the development and optimization of the automobile bumper system to shorten the product development cycle and provide a strong theoretical basis for the structural design and optimization design of the product.In the initial stages of the design,FEA can help analyze the performance of the product,and find the potential defects in the design in advance,thus can improve them timely.In this paper,finite element simulation and experimental study on the modified polypropylene plastic rear bumper are carried out.The stress,strain,displacement and force of the structure that under external load conditions are mainly concerned.Because the load changes slowly over time,the study does not take into account the effects of structural damping and inertial forces,which can be approximately equivalent to a static analysis.Therefore,this paper uses ABAQUS/Standard implicit algorithm to carry out nonlinear static finite element simulation analysis and experimental study on the rear bumper.First of all,the rear bumper CAD model created by CATIA software was imported into HyperMesh software,and the geometry model was simplified,the middle surface was extracted and geometry was cleanuped,then the 2D shell elements were meshed based on the middle surface.And then using ABAQUS and HyperMesh good data interface capabilities,the the finite element model of components was imported into the ABAQUS software.Next,the parts were assembled,the material properties were defined,the analysis steps were created,the contacts and constraints were defined,load and the boundary conditions were also defined.In the end a complete finite element model of rear bumper assembly was established.According to the requirements of the test standard,the stiffness,flexural strength and treading strength were analyzed in detail,and the mechanical properties of the bumper were predicted and evaluated.At last,according to the test standard,the experiments about the bumper’s stiffness,flexural strength and treading strength were carried out.The simulated results were compared with the experimental results,which verified the accuracy of the finite element model and the reliability of the simulation.The boundary condition nonlinearity,material nonlinearity and geometry nonlinearity are solved in this paper.The the key technology of nonlinear finite element analysis is mastered.Combined with the relevant experiments,the stiffness and strength of the product can be accurately predicted.Therefore,it has great guiding significance for engineering practice.At the same time,it also provides technical support for further study on product’s dynamic characteristics,thermal deformation analysis and structural optimization.