Study on dynamic characteristics of aluminum foam filled hemisphere shell

DOI:	10.11809/bqzbgcxb2023.06.009
Keywords:	foam filled hemisphere shell; dynamic impact; diameter to wall thickness ratio; energy absorption characteristics
Abstract:	As its structure has the characteristics of light weight, large bearing capacity and highly efficient energy absorption, the thin wall filled with aluminum foam has been widely applied to different kinds of engineering structures. This study presents a foam filled thin wall hemisphere structure, and investigates its deformation modes and energy absorption characteristics under drop hammer impact through numerical simulation. The influences of diameter to wall thickness ratios, densities of aluminum foam and initial loading velocities on the peak value of impact force, internal energy absorption and vertex displacement of the structure are also investigated. The numerical results indicate that the foam filled hemisphere shell shows more evenly stresses, which makes full use of the plastic deformation ability of the shell material, and shows more excellent energy absorption effect than the hollow hemisphere shell. The aluminum foam filled hemisphere under impact load mainly goes through three stages, such as plastic hinge forming, plastic hinge development and filling foam compression. The main deformation modes of the aluminum foam filled hemisphere under impact load are related to impact energy and density of the filled aluminum foam, which mainly reflect four deformation modes: the edge of the shell raises, and symmetrical indentations are produced in the impact area; the edge of the shell raises and the impact area is flattened; the shell indents inward to form an octagonal plastic hinge, and symmetrical indentations are produced in the impact area; the shell concaves inward to form a flat plastic hinge, and the impact area is flattened.
Published:	2023-06-28
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