Investigation Of The Behavior Of Open-cell Aluminm Foam Of Compression Based On The Finite Element

As a new new type of material,Aluminum foam has the dual attributes of metal materials and foam materials.Aluminum foam can be used as structural materials in general,because of the high intensity and stiffness and low density.In addition,aluminum foam has produces a stress platform areain that makes it to have good effect in energy absorbing during the process of compression,so the foam aluminum is widely used in all kinds of energy absorption structures.Mechanical properties research is the basis of material application,aluminum foam material will be generally under the effect of pressure both as a structural material and energy absorption material.So as the research object in this paper,aluminum foam compression mechanical properties is researched by using numerical simulation combined with micro macro model of theoretical analysis methods.On the basis of predecessors' research,this paper choose the method of ten tetrahedron opening bubble pore structure in alternative microporous structure of aluminum foam to analyze,and the first step in the aspect of theory is to analyze the relationship between the minimum potential energy principle and the aspects of theory of foam aluminum elastic stage compression features.And the result is that the modulus of elasticity and relative density are be in a relationship.Furthermore,aluminum foam ten tetrahedron macro model is established in this paper.In the process of compression simulation experiments by using the ANSYS software,the elastic modulus and yield strength are analyzed.Thus concludes that theories are consistent with the experimental results.And various influence factors on the foam aluminum elastic modulus and yield strength including the relative density,aperture size and substrate materials are analyzed in this paper.For the research aspect of aluminum foam energy absorption,this paper used ABAQUS software to simulate the macro model of aluminum foam compression.Considering the contact element,the result of three process of aluminum foam compression can be concluded,the linear elastic stage,compression platform stage and compaction stage.Using the resulting data in the compression process,aluminum foam energy absorption efficiency curve and ideal energy absorption efficiency curveit can be concluded,thus for aluminum foam energy absorption efficiency evaluation.At the same time,this paper researched in the effects of different density and different substrate materials on aluminum foam energy-absorbing performance.In consideration of the good energy absorption properties of aluminum foam,it has been widely applied in various fields,especially in all kinds of energy absorption parts.There have been a lot of cars filled with aluminum foam structure to increase the collision energy absorption effect,such as auto front longeron.In order to study the buffer energy absorption effect of foam aluminum in the automobile front longeron,this paper simplified the process of vehicle collision,made a comparative analysis of the two structures :add the aluminum foam longeron and not adding aluminum foam,concluded that the aluminum foam filled front longeron in car head-on collision has a better buffer energy absorption effect.