Research On Cushioning Energy Absorbing Structure Design Based On Aluminum Foam

This article is based on the project,engineering application of aluminum foam materials,in cooperation with a research institute.By establishing the FEM(finite element model)of the buffer and energy absorption structure based on the aluminum foam that under impact load,the mechanical properties of aluminum foam and its filled circular aluminum alloy tube as well as the influence of structural parameters of the circular aluminum tube filled with aluminum foam on the acceleration variation law of the equipment during the impact process were studied.And,the parameters of the buffer and energy absorption structure of the elevator was got after designing,and they had been verified.The compressive mechanical properties of aluminum foam and its deformation mechanism were analyzed.And then,the dynamic compressive mechanical properties of aluminum foam were researched by testing with the Split Hopkinson Pressure Bar test(SHPB).The mathematical model was established to describe and analyze the eccentricity and interaction effect on mechanical and energy absorption properties of aluminum foam core cylinder.The scheme that design the buffer and anti-impact protection for objects(heavy equipment)by using aluminum foam core cylinder and spring buffer was discussed.The buffer and energy absorption system model was established and simply calculated that the design method and procedure were got.For practical engineering application,the idea that protect falling elevator from impact with buffer and energy absorption structure based on the aluminum foam was put forward and the elevator buffer scheme in normal operating conditions and falling conditions was researched.The influence of structural parameters of the circular aluminum tube filled with aluminum foam on the acceleration variation law of the elevator during the impact process were analyzed by using MATLAB,and the parameters of the buffer and energy absorption structure of the elevator was figured out.A quasi-static axial compression test of thin-walled metal tube was earried out on the material compression testing machine.Meanwhile,the numerical simulation of the same tube was carried out by using ABAQUS finite element software.The simulation results shows a good agreement with the experimental results.The process that the elevator fell and impacted the buffer and energy absorption structure based on the aluminum foam was simulated.The response of the buffer,the acceleration law of the elevator and the change law of the impact energy of the system during the process were analyzed.The conclusion that the buffer and energy absorption structure based on the aluminum foam can achieve the expected protection for the elevator was drawn.