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Influence of interfaces on effective properties of nanomaterials with stochastically distributed spherical inclusions
Publikationstyp
Journal Article
Date Issued
2013-12-01
Sprache
English
TORE-URI
Volume
51
Issue
5
Start Page
954
End Page
966
Citation
International Journal of Solids and Structures 51 (5): 954-966 (2014)
Publisher DOI
Scopus ID
Publisher
Elsevier
The method of conditional moments is generalized to include evaluation of the effective elastic properties of particulate nanomaterials and to investigate the size effect in those materials. Determining the effective constants necessitates finding a stochastically averaged solution to the fundamental equations of linear elasticity coupled with surface/interface conditions (Gurtin-Murdoch model). To obtain such a solution the system of governing stochastic differential equations is first transformed to an equivalent system of stochastic integral equations. Using statistical averaging, the boundary-value problem is then converted to an infinite system of linear algebraic equations. A two-point approximation is considered and the stress fluctuations within the inclusions are neglected in order to obtain a finite system of algebraic equations in terms of component-average strains. Closed-form expressions are derived for the effective moduli of a composite consisting of a matrix and randomly distributed spherical inhomogeneities. As a numerical example a nanoporous material is investigated assuming a model in which the interface effects influence only the bulk modulus of the material. In that model the resulting shear modulus is the same as for the material without surface effects. Dependence of the bulk moduli on the radius of nanopores and on the pore volume fraction is analyzed. The results are compared to, and discussed in the context of other theoretical predictions.
Subjects
Composites of stochastic structure
Effective properties
Gurtin-Murdoch interface conditions
Size dependence
Spherical nanoparticles
DDC Class
500: Naturwissenschaften
530: Physik
540: Chemie