Simulation And Experiment Of Quasi-static Uniaxial Compression Of Aluminum Foam-polyurethane

Aluminum foam is a new structural material with complex pore structure formed by foaming pure aluminum,which is characterized by light weight and high strength.Because of its unique pore structure,and it has good cushioning,shock absorption,energy absorption and other characteristics,it is widely used in aerospace,shipbuilding,automobile manufacturing and construction.Sphere open-cell aluminum foam(SOAF)is a foamed aluminum in which the inner bubble chamber is spherical and relatively regular.Polyurethane is a lighter,easy to process,low cost porous polymer that is widely used as a filler for structural materials.Polyurethane has good fluidity at the beginning of preparation and can be perfectly combined with aluminum foam.Sphere open-cell aluminum foam-polyurethane(SOAF/PU)composites are commonly used as packaging cushioning materials for cushioning packaging of certain precision instruments due to their unique structure and properties.This paper focuses on the compression and energy absorption properties of SOAF and SOAF/PU composites.The specific process is as follows:(1)Sample preparation: Three SOAF plates with average pore diameters of 5mm(wall hole 1.5mm),7mm(wall hole 2.5mm),and 9mm(wall hole 4mm)provided by Beijing Zhongshi Qiangye Foam Metal Co.,Ltd.It was cut by a wire cutting method into a sample of ? 35 mm × 20 mm.The cut samples are subjected to oil stain treatment,and then dried in a constant temperature drying oven,and then uniformly numbered.The granular polyurethane was melted and filled into the SOAF sample cut in advance to form a SOAF/PU composite.(2)Based on x-ray computer scanning technology(CT scan).I scanned the SOFA and SOFA/PU composites and extracted the scanned files.Then I performed 3D reconstruction through the MIMICS software to generate SOAF models and SOAF/PU composite models similar to the real material structure.(3)Through the ABAQUS finite element simulation software,the reconstructed SOAF model and the SOAF/PU composite model were numerically simulated by quasi-static uniaxial compression.I obtained the corresponding load-displacement curve and converted it into Stress-strain curve and energy-strain curve.(4)Quasi-static uniaxial compression experiments were carried out on SOAF and SOAF/PU composites with different foam aluminum apertures and different foam aluminum relative densities.The load-displacement curve corresponding to each material was obtained through experiments,and transformed into a stress-strain curve by the load-displacement curve,and then the energy-strain curve of each material was converted by the stress-strain curve.The results showed that the higher the relative density of aluminum foam,the greater the pore size of the aluminum foam,the better the compression performance of the material,and the better energy absorption under the same strain.When the foamed aluminum is filled with polyurethane to form a SOAF/PU composite,its compression and energy absorbing properties are superior to those of the two materials alone.(5)The scientific and validity of the above modeling method is verified by comparing the experimental results with the simulation results.It provides methods and basis for the subsequent research of SOAF and SOAF/PU composites.