Počet záznamů: 1
Numerical modeling of aluminium foam on two scales
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SYSNO ASEP 0451804 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Numerical modeling of aluminium foam on two scales Tvůrce(i) Němeček, J. (CZ)
Denk, F. (CZ)
Zlámal, Petr (UTAM-F) RID, SAI, ORCIDCelkový počet autorů 3 Zdroj.dok. Applied Mathematics and Computation. - : Elsevier - ISSN 0096-3003
Roč. 267, September (2015), s. 506-516Poč.str. 11 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova closed-cell aluminium foam ; Alporas ; multiscale modeling ; homogenization ; FFT ; finite element modeling Vědní obor RIV JI - Kompozitní materiály CEP GAP105/12/0824 GA ČR - Grantová agentura ČR Institucionální podpora UTAM-F - RVO:68378297 UT WOS 000361571100042 EID SCOPUS 84942988834 DOI 10.1016/j.amc.2015.01.084 Anotace The paper deals with computational modeling of aluminium foams on two distinct scales. The microscopically heterogeneous cell walls are modeled with continuum micromechanics models. Several analytical schemes and FFT-based homogenization are applied to predict elastic properties at the first level. Nanoindentation with sharp Berkovich tip is utilized to obtain input parameters for the homogenizations. Plastic properties are assessed directly from spherical nanoindentation at this level. Several geometrical simplifications are studied to model the upper foam level. At first, two dimensional models based on beam analogy and plane strain finite element (FE) models are studied for their ability to predict effective elastic and plastic foam properties. Finally, the behavior of the three dimensional voxel based FE model derived from micro-CT imaging is investigated. Models are compared in terms of their ability to predict experimental results and in terms of their computational demands. It is shown in the paper each model type has difficulties to quantitatively match experimental data in the whole tested range. Two dimensional beam models are capable to predict elastic properties but fail to predict plastic ones. Plane strain FE models are very compliant and lack three dimensional confinement. Three dimensional voxel model has the largest potential to predict experimental measurements but it is the most computationally demanding. It was found the performance of all models on the foam level is very much dependent on their porosity which is the main controlling parameter of the model behavior. Any deviations from experimentally assessed porosity leads to large deviations in the model prediction. Mutual model comparisons and possible solutions are provided in the paper along with computational aspects and requirements. Pracoviště Ústav teoretické a aplikované mechaniky Kontakt Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Rok sběru 2016 Elektronická adresa http://www.sciencedirect.com/science/article/pii/S0096300315001162
Počet záznamů: 1