Production of Metallic Foam and its Behavior at Different Strain Rates: A Review

Metallic foams offer unique benefits in fields such as energy-absorbing technologies, lightweight structural sandwich panels, and heat sinks due to their exceptional combination of properties. These foams exhibit distinct mechanical and physical properties including high porosity, stiffness, lightweight, enhanced damping capacity, and low thermal conductivity. This review focuses on the production methods of metallic foams, categorizing the various manufacturing procedures based on the state of matter—solid, liquid, gaseous, or ionized—in which the metal is processed. Additionally, this paper discusses the behavior of metal foam manufactured by different methods at varying strain rates, using universal testing machines and the split Hopkinson pressure bar for quasi-static and high strain rate testing.