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|Title:||Strain-rate Dependence for Ni/Al Hybrid Foams|
|Authors:||JUNG Anne; LARCHER MARTIN; JIROUSEK Ondrej; KOUDELKA Petr; SOLOMOS George|
|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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