High strain rate compressive behaviour of aluminium alloy foams

• Published in: International journal of impact engineering Vol. 24; no. 3; pp. 277 - 298
• Main Authors: Deshpande, V.S., Fleck, N.A.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.03.2000; Elsevier Science
• Subjects: Applied sciences; Exact sciences and technology; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metallic foams; Metals. Metallurgy; Other mechanical properties; Quasi-static and dynamic crushing; Split Hopkinson pressure bar; Metallic foams; Quasi-static and dynamic crushing; Split Hopkinson pressure bar; Wave propagation; Foam; Computer simulation; Crushing; Kinematics; Plastic wave; Cellular material; Aluminium alloy; Plastic deformation; Shock wave; Strain rate
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/S0734-743X(99)00153-0

The high strain rate compressive behaviour of two cellular aluminium alloys (Alulight and Duocel) has been investigated using the split Hopkinson pressure bar and direct impact tests. It is found that the dynamic behaviour of these foams is very similar to their quasi-static behaviour. The plateau stress is almost insensitive to strain rate, for strain rates ε ̇ up to 5000 s −1 . Deformation is localised in weak bands in the Alulight foam but is spatially uniform for the Duocel foam, over the full range of strain rates 10 −3 s −1⩽ ε ̇ ⩽5000 s −1 .