Identification of stress-strain relation of aluminium foam cell wall by spherical nanoindentation

0428836 - ÚTAM 2015 RIV CH eng C - Conference Paper (international conference)
Králík, V. - Němeček, J. - Koudelka_ml., Petr
Identification of stress-strain relation of aluminium foam cell wall by spherical nanoindentation.
Key Engineering Materials. Vol. 606. Durnten-Zurich: Trans Tech Publications, 2014 - (Haušild, P.), s. 11-14. ISBN 978-3-03835-062-0. ISSN 1013-9826.
[Local Mechanical Properties /10./. Kutná Hora (CZ), 06.11.2013-08.11.2013]
R&D Projects: GA ČR(CZ) GAP105/12/0824
Institutional support: RVO:68378297
Keywords : aluminium foam * spherical nanoindentation * micromechanical properties * plastic properties
Subject RIV: JI - Composite Materials
http://www.scientific.net/KEM.606.11

The aim of this paper is to identify, in addition to elastic properties, inelastic properties of tiny aluminium foam cell walls that can be directly deduced from the loaddepth curves of spherical indentation tests using formulations of the representative strain and stress. Constitutive parameters related to plastic material with linear isotropic hardening, the yield point (122 ± 17 MPa) and tangent modulus (950 ± 377 MPa), were obtained in this work. Spherical indentation and uniaxial tension experiments have also been performed on a standard aluminium alloy EN AW 6060 to explore the accuracy of the analytical models used to predict the uniaxial stressstrain in wide strain ranges. Some deviations received from different tests arose and, therefore, their effect on the evaluation of inelastic properties was discussed.
Permanent Link: http://hdl.handle.net/11104/0234145