Effect Of Hole Structure On Compression And Energy Absorption Of Aluminum Foam Based On ABAQUS Simulation

In this paper,voronoi technology was used to establish the aluminum foam model,and the quasi-static uniaxial compression experiment was simulated in ABAQUS software.The effects of porosity,pore size,pore size distribution and their interactions on compression and energy absorption of aluminum foam were studied by orthogonal experiments.And the simulation results were theoretically analyzed and experimentally verified.The main research contents and results of this paper are as follows:(1)Design an orthogonal table with three factors and three levels of porosity,pore size and pore size distribution without regard to the interaction among porosity,pore size and pore size distribution and establish the corresponding aluminum foam models.And the quasi-static uniaxial compression experiment of these models are simulated by ABAQUS software.The simulation results show that firstly porosity is the main factor affecting the energy absorption performance of aluminum foam,followed by pore size and pore size distribution;secondly,When the porosity is 65%～75%,the elastic modulus,yield strength,platform stress and energy absorption capacity of aluminum foam decrease with the increase of porosity,while the compacted strain increases.Moreover,when the porosity is higher than 70%,the larger the porosity is,the closer the compressive stress-strain curve will be;thirdly,When the pore size range is set between 2.8mm-5mm,its influence on aluminum foam compression and energy absorption performance is very limited;and fourth,in terms of several pore size distributions set in this paper,the influence of pore size distribution is small,but it is found that the more uniform the pore size distribution is,the better the performance of aluminum foam is,but it needs to be matched with the porosity and pore size.(2)Design an orthogonal table which consider the interaction among porosity,pore size and pore size distribution,and establish the corresponding aluminum foam models for quasi-static uniaxial compression.And compare the compression results with the results when the interactions are not considered.The results show that when the elastic modulus of aluminum foam is used as the experimental index,the range value of the interaction between porosity and pore size is 590.74,while the range value of pore size is 139.74.In other words,the interaction between porosity and pore size has a greater impact on the elastic modulus than pore size.However,when yield strength,platform stress and energy absorption capacity are used as test indexes,the priority order of influencing factors is still porosity as the main factor and pore size as the secondary factor.(3)Design an experiment to prepare aluminum foam by urea sintering method and to perform quasi-static uniaxial compression.By analyzing and comparing the experimental compression results with the simulation results,it is found that the errors between the two results are relatively large.But the change law of the two stress-strain curves is consistent.The possible reasons are as follows: on the one hand,the serious oxidation of the sample in the sintering process leads to a great decline in its mechanical properties,which leads to a large error between the simulation and the experimental results.On the other hand,the approximate idealization of aluminum foam structure in the simulation,that is,the existence of defects is ignored,resulting in better mechanical properties than the actual.(4)Comparing the simulation results with the theoretical analysis,the results show that the influence of porosity and pore size on the mechanical properties of aluminum foam is consistent with the theoretical analysis results,that is,the research method adopted in this paper is theoretically feasible...