Compression test simulation of controlled cell shape open cellular magnesium alloy under dynamic loading

This paper deals with compression test simulations of open cellular magnesi um alloy under dynamic loading to analyze the characteristics of energy abs orption. Metallic foams are new lightweight materials that have some excell ent mechanical and chemical properties. The major characteristics of open c ellular Mg alloy are ultra low density (about 0.05 kg/m(3)) and energy abso rption ability. Therefore this material can be used as suitable material fo r transportation systems. Most studies of metallic foams have been done usi ng the Al close-cell foams so far and there are few studies for Mg open-cel l foams. To make the open-cell metallic foams, the polyurethane form is use d as the base shapes of metallic foams. As a result, it is very difficult t o manufacture foams into the required shapes. If shapes of each cell can be controlled, the mechanical properties of the foams can be designed as expe cted. In this paper, we simulated the compression test of the shape control led open-cell materials under dynamic Loading made of Mg alloy by Finite El ement Method (LS-DYNA). The analyzed sample is 14 mm cubic which includes 2 7 cell units. The strain rates of simulations are 10(2), 10(3) and 10(4) s( -1). The sample is compressed between static and moving rigid walls. Simula tion results show that the difference of strain rate affects the compressio n behavior and the total amount of absorbed energy.