Experimental And Simulation Study On Compression Performance Of Closed Cell Aluminum Foam

Foamed aluminum is a structure containing a large number of holes after foaming treatment with aluminum or aluminum alloy as the matrix.Due to its unique pore structure,foamed aluminum has excellent sound absorption,energy absorption,heat insulation and other excellent properties,and is widely used in automobiles,railways,aerospace and other fields.Aluminum foam has low yield strength and long plateau stage,so it is an excellent energy absorbing material.This paper mainly focuses on the experimental and simulation research on the compression performance of closed-cell aluminum foam.This paper has carried out normal temperature and high temperature quasi-static compression tests on closed-cell aluminum foam.The results show that all stress-strain curves show obvious three stages: linear elastic stage,stress plateau stage,and densification stage.As the density of foamed aluminum increases,the elastic model and platform stress increase significantly;as the temperature increases,the matrix softens,and the elastic modulus and platform stress decrease.The energy absorption performance of foamed aluminum is analyzed,and the results show that the ideal energy absorption efficiency of this kind of foamed aluminum is 0.9,which is an excellent energy-absorbing material.Using the Hopkinson pressure bar device,the impact test of the foamed aluminum under different strain rates was carried out,and the stress-strain curve under the high strain rate was obtained.The comparison with the stress-strain curve under quasi-static compression shows that this kind of closed-cell aluminum foam is a rate-independent material within the test strain rate range.The failure process of closed-cell aluminum foam was analyzed by observing the changes in the appearance of the aluminum foam specimens during the quasi-static and dynamic tests.A one-dimensional constitutive model of aluminum foam considering temperature and strain rate is constructed,and its parameters are fitted based on the data obtained from the experiment,and the fitting effect is good.Based on the data obtained from the experiment and the Crushable foam plastic model in ABAQUS,a simulation method for foam aluminum is established,and then the energy absorption performance of the thin-walled tube filled with foam aluminum is numerically simulated.The results show that the energy absorption performance of the thin-walled round tube is significantly improved after the foamed aluminum is filled.Finally,the influence of pipe diameter and wall thickness on the energy absorption performance of thin-walled round pipes filled with aluminum foam is discussed.This research can provide a certain reference for closed-cell aluminum foam test and numerical simulation.