Study Of Mechanical Properties Of Aluminum Foam Composite Structure Based On Finite Element

This topic takes aluminum foam sandwich panel as the research object,and uses a combination of numerical simulation and experiment to analyze and optimize the influence law of key pore structure parameters such as porosity and pore diameter as well as panel thickness on the mechanical properties of aluminum foam composite structure,and integrates the synergistic effect between parameters,which has certain theoretical value for the study of aluminum foam mechanical properties.The composite structure aluminum foam model was established by voronoi technique,and the dynamic and static compression simulation tests were carried out in ABAQUS software for the aluminum foam sandwich panel structure under two strain rate cases.Based on the orthogonal test,the priority order and influence law of porosity,pore size and panel thickness on the mechanical properties of aluminum foam sandwich panel were investigated,as well as the interaction between porosity,pore size and panel thickness,and the significance of the interaction on the mechanical properties were discussed.Finally,validation tests were conducted for the simulation test results.The main research contents and conclusions of this paper are as follows.(1)For the three independent factors of porosity,pore size and panel thickness,corresponding models were established and dynamic and static compression simulation tests were conducted for two strain rate cases.The results show that: 1)the strong and weak influences on the mechanical properties of aluminum foam sandwich panel are porosity > pore diameter >panel thickness;2)when the porosity is 65%-75%,the porosity increases,the elastic modulus,yield stress and platform stress values decrease,and the densification strain becomes larger;3)the best design of dynamic and static compression parameters are 65% porosity,2mm pore diameter and 1mm panel thickness,and the static compression The value of elastic modulus is 13.7Gpa,the value of yield stress is 17.4Mpa,and the value of platform stress is 21.5Mpa;the elastic modulus under dynamic compression is 23.8Gpa,the yield stress is20.4Mpa,and the platform stress is 25.9Mpa.(2)Design the orthogonal table considering the interaction of porosity,pore size and pore size distribution,establish the corresponding model,and conduct dynamic and static compression simulation tests under two strain rates.Comparing the results with those without considering the interaction,it was concluded that: 1)when the modulus of elasticity was used as the mechanical property index,the porosity had the greatest influence,and the interaction between porosity and pore diameter was greater than that of pore diameter;2)when the yield stress and platform stress were used as the property index,the order of influence of each factor was still the greatest influence of porosity,and the influence of pore diameter was the second.(3)The comparison of dynamic and static compression test results shows that: the effect law remains the same when the strain rate increases,but there is an effect on the elastic modulus,yield stress,platform stress,three performance index values and densification strain value.In dynamic compression,the modulus of elasticity,yield stress and platform stress of the same conditions will slightly increase,and the time into densification will be late.(4)The change patterns of stress-strain curves of the validation test and the simulation test are basically consistent,and the performance indexes are close,indicating that the simulation method used is feasible.