Numerical Investigation of Energy Absorption of Thinwalled Combined Geometry under Axial and Oblique Loading

In this paper, energy absorption of aluminum thin-walled combined geometry, including a cylinder and a hemisphere under axial and oblique loading, is investigated using numerical simulation. The aim of this research is optimizing the dimensions of the combined geometry in order to increase the energy absorption capacity and comparing it with an equal weight thin-walled simple cylinder. Numerical simulations were performed at 0, 7, 14, and 21 degree of loading using ABAQUS software. The results showed that with increasing the radius of curvature and decreasing the height of the combined geometry, energy absorption parameters increase, and in general the combined geometry has better performance than the simple cylinder especially in oblique loading. The SAE and CFE of the optimum combined geometry with dimensions of R = 25mm, h = 25mm, H = 181:92mm, and D = 50mm in the 0 and 7 degree of loading is similar and in the 14 and 21 degree of loading increased 300% and 200% respectively in comparison with an equal weight thin-walled simple cylinder.