Strain-rate effects in Ni/Al composite metal foams from quasi-static to low-velocity impact behaviour |
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Affiliation: | 1. Departamento de Ingeniería en Metalurgia y Materiales, Instituto Politécnico Nacional, Escuela Superior de Ingeniería Química e Industrias Extractivas – ESIQIE, UPALM, 07051 Ciudad de México, México;2. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México – UNAM, Circuito exterior, s/n, Cd. Universitaria, 04510 Ciudad de México, Mexico |
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Abstract: | Metal foams are used as absorbers for kinetic energy but predominantly, they have only been investigated under quasi-static load-conditions. Coating of open-cell metal foams improves the mechanical properties by forming of Ni/Al hybrid foam composites. The properties are governed by the microstructure, the strut material and geometry. In this study, the strain-rate effects in open-cell aluminium foams and new Ni/Al composite foams are investigated by quasi-static compression tests and low-velocity impact. For the first time, drop weight tests are reported on open-cell metal foams, especially Ni/Al composite foams. Furthermore, size-effects were evaluated. The microstructural deformation mechanism was analysed using a high-speed camera and digital image correlation. Whereas pure aluminium foams are only strain-rate sensitive in the plastic collapse stress, Ni/Al foams show a general strain-rate sensitivity based on microinertia effects and the rate-sensitive nano-nickel coating. Ni/Al foams are superior to aluminium foams and to artificial aluminium foams with equal density. |
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Keywords: | A Foams A Multifunctional composites B Impact behaviour D Mechanical testing |
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