Abstract
AbstractCellular metals can be applied in crash absorbers, heat exchangers and heat isolators, lightweight structures, acoustic and vibration damping. Cellular materials with a fairly uniform microstructure may be obtained with metallic hollow spheres welded or bonded. Such materials are known as MHSS (Metallic Hollow Sphere Structures). Crash absorbers, that act in compression and can be severely deformed, suffer severe deformation and some level of ductile damage can be expected. To consider this damage effect, the Gurson model is employed in this paper. Numerical simulation via finite elements is employed to study the mechanical behaviour of MHSS, focusing on two major aspects: first, the effect of previous compression and load reversal on voids nucleation; second, the consideration of nonuniform material properties of the metallic spheres. Numerical results are compared with experimental data.KeywordsMetallic hollow sphere structuresGurson damage modelFinite elements
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