Multi-objective optimization of collision damage of reinforced plastic anti-collision beams based on NSGA-Ⅱ
To consider the influence of low-speed collision damage on the mechanical properties of carbon fiber reinforced plastic(CFRP)anti-collision beams in design,VUSDFLD subroutine with improved Hashin failure criterion was developed to determine the dam-age degree in seven directions of CFRP anti-collision beams during low-speed collision.The shell element was used to simulate the me-chanical properties of reinforced plastic,and the explicit finite element dynamic model of CFRP anti-collision beams was established.This method was used to calculate the residual strength of reinforced plastic laminates during low-speed impact under the same experimental conditions,and the calculation results were compared with the experimental results.The simulation results agree well with the experimen-tal results.On this basis,taking the layup thickness and layup angle of reinforced plastic anti-collision beams as design variables,and taking the quality of reinforced plastic anti-collision beams and the number of damage units generated during low-speed impact as optimiza-tion objectives,the multi-objective optimization model of low-speed collision damage dynamics of CFRP anti-collision beams was estab-lished.An improved NSGA-Ⅱ non-dominated sorting genetic algorithm based on Pareto strategy was used to solve the multi-objective opti-mization.After optimization,the weight of CFRP anti-collision beam decreases from 1.02 kg to 0.76 kg,and the weight reduction rate is 25％.The number of damage units decreases from 30238 to 23206,and the damage reduction rate is 23％.The results show that the VUSDFLD subroutine developed based on Hashin failure criterion and the multi-objective optimization of low-speed collision damage of CFRP anti-collision beams are effective,which provides a reference for the optimal design of reinforced plastic anti-collision beams.
万方数据
维普
