Experimental And Numerical Simulation Of Mechanical Properties Of Aluminum Foam Compression

Aluminum foam is a kind of new material which based on Aluminum substrate and has cavernous structure distribution. Aluminum foam widely used in many situations due to its special structure and the excellent physical properties and mechanical properties, such as aerospace, transportation, environmental protection, machinery and petrochemical and other fields. The key of the research is to master the mechanical properties of Aluminum foam which is the basis of the engineering application. The main research of the paper is the compressive mechanical properties of Aluminum foam material, mainly because the compressive mechanical properties more common in the practical application than the tensile mechanical properties. The research basis of the compressive mechanical properties of Aluminum foam is the study of material’s constitutive equation. The common study methods of constitutive relation of Aluminum foam are the real experimental testing and the numerical simulation in domestic and overseas. Due to the combination of the two methods of the Aluminum foam study is not well, it is difficult to popularize the effective conclusions from real experimental testing technology. On the other hand, the numerical simulation lacks of corresponding experiment to verify which makes it has low credible and not high engineering practical value. In this paper, the real static and dynamic compressive mechanical experimental testing of Aluminum foam and the numerical simulation technology were closely integrated. At first, the constitutive relation curves will be obtained by mechanical experiment. Then, appropriate constitutive model will be selected and fitting out the constitutive equation parameters combined with the experimental results. Finally, apply the obtained parameters of constitutive equation in numerical simulation, assessing the validity of the results of simulation and the feasibility of the numerical simulation through the analysis of simulation results with the experimental results. Main works and results of this paper were as follows:1) Domestic and international literatures of Aluminum foam mechanical properties researches under the dynamic and static compression mechanical properties were collected. The research status of Aluminum foam constitutive relation under the dynamic and static was summarized, the present situation of theoretical research and research methods especially characteristics of several different Aluminum foam constitutive model were introduced.2) The static and dynamic mechanical properties of different cell structure Aluminum foam were tested by the mechanical experiment under the quasi-static compression, dynamic compressive mechanical properties under different strain rates experiment. By processing the experimental data, got all the Johnson-Cook parameters of the constitutive model needed that laid the foundation for the accurate simulation of Aluminum foam dynamic experimental under different strain rates. Dynamic analysis software LS-DYNA and Johnson-Cook model was combined to numerical simulation. The influence of the constitutive relation under passive confining pressure was analyzed.3) Three-dimensional finite element model of the open-cell Aluminum foams was established according to the actual situation and size of SHPB dynamic mechanical experiment equipment. Johnson-Cook constitutive model was adapted to the open-cell Aluminum foam material and Crushable constitutive model for the closed-cell. By compared the real experimental results with simulation result analyzed the errors quantitatively and systematically analyzed the source of the errors to verify the feasibility and effectiveness that used Johnson-cook and Crushable constitutive model to simulate the open-cell and closed-cell Aluminum foams under dynamic pressure respectively.The study and analysis process of the paper closely integrated the experimental testing and the numerical simulation of Aluminum foam. The parameters of constitutive equation obtained from the experimental results applied to the numerical simulation finite element software, and analyzed the errors and assessed the validity the feasibility of numerical simulation. Experiment testing could reflect the compressive mechanical properties of Aluminum foams and numerical simulation could obtain the compressive mechanical properties of material within the allowed error range, and then, applied the material mechanical parameters to finite simulation software to acquire the material properties under different working conditions. This study method reduces the influence of artificial factors under the real working conditions, cost savings and has high economic value.