Title: Strain-rate Dependence for Ni/Al Hybrid Foams
Publisher: EDP Sciences
Publication Year: 2015
JRC N°: JRC94852
ISSN: 2100-014X
URI: http://www.epj-conferences.org/articles/epjconf/abs/2015/13/epjconf-dymat2015_04030/epjconf-dymat2015_04030.html
DOI: 10.1051/epjconf/20159404030
Type: Articles in periodicals and books
Abstract: Shock absorption often needs stiff but lightweight materials that exhibit a large kinetic energy absorption capability. Open-cell metal foams are artificial structures, which due to their plateau stress, including a strong hysteresis, can in principle absorb large amounts of energy. However, their plateau stress is too low for many applications. In this study we use highly novel and promising Ni/Al hybrid foams which consist of standard, open-cell aluminium foams, where nanocrystalline nickel is deposited by electrodeposition as coating on the strut surface. The mechanical behaviour of cellular materials, also under higher strain-rates, is governed by their micro-structure due to the properties of the strut material, pore/strut geometry and mass distribution over the struts. Micro inertia effects are strongly related to the micro structure. For a conclusive model the exact real micro-structure is needed. In this study a micro-focus computer tomography (μCT) system has been used for the analysis of the micro-structure of the foam samples and for the development of a micro-structural Finite Element (micro-FE) mesh. The micro-structural FE models have been used to model the mechanical behaviour of the Ni/Al hybrid foams under dynamic loading conditions. The simulations are validated by quasi-static compression tests and dynamic split Hopkinson pressure bar tests.
JRC Directorate:Space, Security and Migration

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