Open AccessScaling of compression strength in disordered solids: metallic foams
Author(s) -
J. Ková ik,
Jaroslav Jerz,
Natália Mináriková,
Liviu Marşavina,
Emanoil Linul
Publication year - 2016
Publication title -
frattura ed integrità strutturale
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.368
H-Index - 19
ISSN - 1971-8993
DOI - 10.3221/igf-esis.36.06
Subject(s) - materials science , scaling , compression (physics) , composite material , metal , compressive strength , metallurgy , mathematics , geometry
The scaling of compression strength with porosity for aluminium foams was investigated. The Al\ud99.96, AlMg1Si0.6 and AlSi11Mg0.6 foams of various porosity, sample size with and without surface skin were\udtested in compression. It was observed that the compression strength of aluminium foams scales near the\udpercolation threshold with Tf ≈ 1.9 - 2.0 almost independently on the matrix alloy, sample size and presence of\udsurface skin. The difference of the obtained values of Tf to the theoretical estimate of Tf = 2.64 ± 0.3 by Arbabi and Sahimi and to Ashby estimate of 1.5 was explained using an analogy with the Daoud and Coniglio approach to the scaling of the free energy of sol-gel transition. It leads to the finding that, there are two\uddifferent universality classes for the critical exponent Tf: when the stretching forces dominate Tf = f = 2.1, respectively when bending forces prevail Tf = .d = 2.64 seems to be valid. Another possibility is the validity of relation Tf ≤ f which varies only according to the universality class of modulus of elasticity in foam