Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 85, Issue -, Pages 1-11Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2016.02.031
Keywords
Foams; Multifunctional composites; Impact behaviour; Mechanical testing
Funding
- Daimler and Benz Foundation [32-07/14]
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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. (C) 2016 Elsevier Ltd. All rights reserved.
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