Scaling of compression strength in disordered solids: metallic foams
Autor: | Jaroslav Jerz, Liviu Marsavina, Natália Mináriková, Emanoil Linul, J. Ková ik |
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Rok vydání: | 2016 |
Předmět: |
Materials science
lcsh:Mechanical engineering and machinery lcsh:TA630-695 chemistry.chemical_element Thermodynamics Aluminium foams Young's modulus 02 engineering and technology Metallic foams symbols.namesake 0203 mechanical engineering Aluminium Compression strength Forensic engineering lcsh:TJ1-1570 Porosity Scaling Mechanical Engineering Compression Percolation Percolation threshold lcsh:Structural engineering (General) 021001 nanoscience & nanotechnology Universality (dynamical systems) 020303 mechanical engineering & transports Compressive strength chemistry Mechanics of Materials symbols 0210 nano-technology Critical exponent |
Zdroj: | Frattura ed Integrità Strutturale, Vol 10, Iss 36 (2016) Frattura ed Integrità Strutturale; Vol 10 No 36 (2016): April 2016; Pages 55-62 Frattura ed Integrità Strutturale; V. 10 N. 36 (2016): April 2016; Pages 55-62 Frattura ed Integrità Strutturale, Vol 10, Iss 36, Pp 55-62 (2016) |
ISSN: | 1971-8993 |
Popis: | The scaling of compression strength with porosity for aluminium foams was investigated. The Al 99.96, AlMg1Si0.6 and AlSi11Mg0.6 foams of various porosity, sample size with and without surface skin were tested in compression. It was observed that the compression strength of aluminium foams scales near the percolation threshold with Tf ≈ 1.9 - 2.0 almost independently on the matrix alloy, sample size and presence of surface 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 different 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. |
Databáze: | OpenAIRE |
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