Abstract
The aim of this study is to investigate stress wave propagation in metal foams under high-speed impact loading. Three-dimensional Voronoi model is established to represent real closed-cell foam. Based on the one-dimensional stress wave theory and Voronoi model, a numerical model is developed to calculate the velocity of elastic wave and shock wave in metal foam. The effects of impact velocity and relative density of metal foam on the stress wave propagation in metal foams are explored respectively. The results show that both elastic wave and shock wave propagate faster in metal foams with larger relative density; with increasing the impact velocity, the shock wave propagation velocity increase, but the elastic wave propagation is not sensitive to the impact velocity.
Highlights
Numerical modellingIn which ρ∗ is the density of foam, ρs is the density of base material, Ai is the area of the cell wall and V is the total volume of foam model. n is the number of cell wall and t is the cell wall thickness
The aim of this study is to investigate stress wave propagation in metal foams under high-speed impact loading
Some researchers point that the dynamic stress enhancement in metal foams under dynamic impact is mainly caused by inertia effect, other than strain rate effect of base material [3, 4], some other researchers hold the opposite point [5, 6]
Summary
In which ρ∗ is the density of foam, ρs is the density of base material, Ai is the area of the cell wall and V is the total volume of foam model. n is the number of cell wall and t is the cell wall thickness. In which ρ∗ is the density of foam, ρs is the density of base material, Ai is the area of the cell wall and V is the total volume of foam model. N is the number of cell wall and t is the cell wall thickness. The dynamic compression process is implemented using commercialized software LS-DYNA
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