Dynamic Response Of Aluminum Foam Filled Pipe Under Lateral Explosion Load

Foamed aluminum filled single tube and double tubes are used as energy buffer devices because of their good impact resistance and energy absorption performance.They are widely used in automobiles,transportation,aerospace and other fields.Under the action of explosive load,the structure may become unstable due to large plastic deformation.This paper takes foam aluminum filled single tube and double tubes as the research object,combining with theoretical analysis and numerical simulation to study the dynamic response.The main work is as follows:(1)The dynamic response of foamed aluminum-filled single tube was studied combining of numerical simulation and theoretical analysis under lateral explosive load.The finite element software ABAQUS/EXPLICIT was used to carry out a numerical simulation study on the plastic deformation of a foamed aluminum-filled single tube under lateral explosive load,and the influence of factors such as the relative density of the foamed aluminum,the diameter and wall thickness of the outer tube on the dynamic response of the structure was analyzed.Based on the ideal rigid-plastic foundation beam model,combined with the modal analysis method,a theoretical analysis model for predicting the mid-span deflection of the foamed aluminum filled pipe under lateral explosive load was established,and dimensionless analysis was carried out.Variation law of dimensionless deflection with dimensionless impulse in mid-span was given.The error between the theoretical prediction and the numerical simulation result of the foamed aluminum filled pipe mid-span deflection is within 20%,indicating that the established theoretical analysis model is reasonable and feasible.The relative density of foamed aluminum has a great influence on the mid-span deflection of the filled pipe under lateral explosive load.As the relative density of foamed aluminum increases,the mid-span deflection of the filled pipe decreases.As the diameter and wall thickness of the outer tube increase,the mid-span deflection decreases.The two modal functions assumed in the theoretical analysis have little effect on the mid-span deflection of the filled single pipe.(2)Combining theoretical analysis and numerical simulation,the dynamic response of aluminum foam-filled double pipes under lateral explosion loads was studied.The finite element model of the double-tubes filled with foamed aluminum was established,the dynamic response under lateral explosive load was studied,and the influence of the relative density of foamed aluminum and the wall thickness of the round tube on the dynamic response of the structure was analyzed.A theoretical analysis model was established to predict the mid-span deflection of the foamed aluminum-filled double pipes under lateral explosive load.The influence of the length-diameter ratio,the wall thickness of the tube,the thickness of the core layer,the relative density of the foamed aluminum,the peak value of the explosive load,and the attenuation constant on the dimensionless deflection of the mid-span was systematically analyzed.The research results show that the modal solution of the mid-span deflection is in good agreement with the numerical simulation results.The dimensionless deflection in the mid-span increases with the increase in the aspect ratio,the decrease in the wall thickness of the round tube,the decrease in the relative density and the thickness of the foamed aluminum.The dimensionless deflection in the mid-span increases with the increase in the dimensionless impulse,the increase of the peak of the explosive load and the increase of the attenuation constant increase.