Structural Parameter Optimization Of Door Anti Collision Beam Made Of High Strength Steel

Due to the requirement to protect the occupants,countries all over the world have issued more and more stringent regulations.As the main reinforcement inside the door,the door anti-collision beam can reduce the deformation of the door due to impact,and improve its rigidity and energy absorption performance,which is of great significance for the side safety of the car.In this paper,the structure optimization of the door anti-collision beam made of high strength steel is carried out to improve its overall performance,and the hot stamping formability is analyzed.The main contents are as follows:Firstly,the performance evaluation index of the anti-collision beam is defined.Based on the three-point bending test,the finite element model of performance detection is established.The performance of the original door anti-collision beam is analyzed,and the rationality of the model is demonstrated.The appropriate section parameters are selected as variables,and the value range of each variable is determined according to the requirements of the door space size.Secondly,the orthogonal experimental design method is used to draw up the variable combination scheme for simulation,and the impact force and specific energy absorption are taken as the evaluation indexes to analyze the significance of the influence of each variable on the performance of the anti-collision beam and determine the optimization parameters.The response surface method is used to fit the response function.Taking the specific energy absorption as the optimization objective and the impact force as the constraint condition,the optimization mathematical model is established,and the genetic algorithm function is used to solve the problem to obtain the optimal section parameters.Then,according to the optimal cross-section parameters,the door anti-collision beam is designed for three-point bending simulation,and compared with the original anti-collision beam;based on the FMVSS214 regulations,the side impact model of the door is established,and the bending resistance and energy absorption performance of the door before and after the optimization of the anti-collision beam are analyzed.Finally,according to the optimized anti-collision beam structure and thermodynamics,the key parameters of cooling system are obtained,the hot stamping model is established and stamping simulation is carried out to analyze the forming quality of the plate.The quenching process is simulated by ABAQUS software,the temperature field of the plate and die is analyzed,the cooling rate of the plate is calculated,and the closed-loop from optimization design to process forming is realized.