Identification of Stress-Strain Relation of Aluminium Foam Cell Wall by Spherical Nanoindentation

Vlastimil Králík; Jiří Němeček; Petr Koudelka

doi:10.4028/www.scientific.net/KEM.606.11

Paper Titles

Preface, Organizing Committee and Sponsors

Local Characteristics of Ductile Fracture Surface in Spheroidized Steels
p.3

Characterization of Local Stress-Strain Behavior in WWER 440 Weld and Base Metal by Instrumented Indentation Technique
p.7

Identification of Stress-Strain Relation of Aluminium Foam Cell Wall by Spherical Nanoindentation
p.11

Characterisation of Mechanical Properties by Small Punch Test
p.15

Microstructure and Mechanical Properties of Al-Mn Sheets with Zr Addition
p.19

Local Strain Hardening and Non-Uniformity of Plastic Strain of Tinplate
p.23

Effect of Boriding Time on Microstructure and Residual Stresses in Borided Highly Alloyed X210CR12 Steel
p.27

Evaluation of Fatigue Strength of Heat Treated and Laser Hardened 42CrMo4 Steel Considering Localized Initiation Mechanisms
p.31

HomeKey Engineering MaterialsKey Engineering Materials Vol. 606Identification of Stress-Strain Relation of...

Identification of Stress-Strain Relation of Aluminium Foam Cell Wall by Spherical Nanoindentation

Abstract:

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.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Key Engineering Materials (Volume 606)

Pages:

11-14

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.606.11

Citation:

Cite this paper

Online since:

March 2014

Authors:

Vlastimil Králík*, Jiří Němeček, Petr Koudelka

Keywords:

Aluminum Foam, Micromechanical Properties, Plastic Properties, Spherical Nanoindentation

Export:

RIS, BibTeX

Price:

Permissions:

Request Permissions

* - Corresponding Author

References

[1] P. Haušild, A. Materna, J. Nohava, On the identification of stress–strain relation by instrumented indentation with spherical indenter. Materials and Design (2012) 37, 373-378.

DOI: 10.1016/j.matdes.2012.01.025

Google Scholar

[2] D. Tabor, Hardness of Metals, Clarendon Press, Oxford, (1951).

Google Scholar

[3] T. Doktor et. al, Simulation of a Three-Point Bending Test on the Isolated Cell Wall of Aluminium Foam, in: B.H.V. Topping, editor, Proc. of the 14th Int. Conf. on Civil, Struct. and Env. Eng. Comp., Stirlingshire: Civil-Comp Press (2013).

DOI: 10.4203/ccp.102.104

Google Scholar

[4] E.G. Herbert et. al, On the measurement of stress–strain curves by spherical indentation. Thin Solid Films, 398–399 (2001) 331–335.

DOI: 10.1016/s0040-6090(01)01439-0

Google Scholar

[5] J. Němeček, V. Králík, J. Vondřejc, A two-scale micromechanical model for aluminium foam based on results from nanoindentation, Computers and Structures 128 (2013) 136–145.

DOI: 10.1016/j.compstruc.2013.07.007

Google Scholar

[6] W. Oliver, G. Pharr, An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments. J. Mat Res (1992) 7 (6) 1564-1583.

DOI: 10.1557/jmr.1992.1564

Google Scholar

[7] V. Králík, J. Němeček, Spherical nanoindentation applied on aluminium foam, Proceedings of the 19th international conference Engineering mechanics (2013), 89-90. ISBN 978-80-87012-46-8.

Google Scholar