Structure Optimization Design And Process Research On CFRP Bumper Beam

In automobile environmental pollution,the weight reduction of automobiles has become increasingly important.As carbon fiber reinforced polymer(CFRP)materials with excellent properties are widely used in automobiles and as important components of automobile front ends,CFRP bumper beam needs further research.However,the high nonlinearity caused by the anisotropy of carbon fiber materials and the collision process,the optimal coupling of carbon fiber layups,and the constraints of the layup process have brought great challenges to the optimal design process of carbon fiber collision beams.In order to solve the above problems,this paper proposes a new type of multi-objective particle swarm to make the optimization process of carbon fiber crash beams with high efficiency and low error,and also proposes a structural design method of carbon fiber crash beams that considers the compatibility of the pavement process constraints.The thesis first established the finite element analysis model of the original steel bumper beam,and performed low-speed and high-speed impact simulations to analyze its performance.The high-speed impact test verified the accuracy of the finite element simulation model.Orthogonal test optimization design method is used to find the optimal CFRP collision beam section parameter combination,and the collision beam optimization design is completed.Based on this section,a single factor analysis of the thickness of the carbon fiber ply is performed to determine the ply Optimized space for thickness.This paper proposes a structural optimization design method of CFRP bumper beams based on ply compatibility.The ply order is optimized for different thicknesses,so that as many ply orders are shared as possible for different thicknesses.The CFRP bumper beam layup sequence and layup thickness are optimized simultaneously considering the carbon fiber layup process constraints.Considering the optimization problem of carbon fiber pavement and the highly nonlinear collision process of collision beam,a multi-objective particle swarm optimization algorithm(KMOPSO)based on the Kriging model plus point strategy is proposed.The goal is to minimize the mass and peak force.The intrusion amount is a constraint condition,and the multi-objective optimization of the thickness of the CFRP bumper beam is optimized.The CFRP bumper beam has a multi-objective optimization process with high efficiency and low optimization results.The significant weight reduction is 47.26%.The simulation process of the bumper beam was determined and the molding pressure was determined.The prototype of the CFRP bumper beam is trial-produced using the molding process.The static three-point bending test and low-speed impact test are performed.The results shows the optimization results are in accordance with test results,and optimization results are correct and reliable.