Loading...

Surface energy effects on the yield strength of nanoporous materials containing nanoscale cylindrical voids

Goudarzi, T ; Sharif University of Technology | 2010

962 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.mechmat.2010.07.006
  3. Publisher: 2010
  4. Abstract:
  5. Surfaces and interfaces behave differently from their bulk counterparts especially when the dimensions approach small scales. The recent studies have shown that the surface/interface free energy (surface stress) plays an important role in the effective mechanical properties of solids with nanosized inhomogeneities. In this work, within a micromechanical framework, the effect of surface stress is taken into account to obtain a macroscopic yield function for nanoporous materials containing cylindrical nanovoids. Gurtin-Murdoch model of surface elasticity is incorporated in the generalized self-consistent method to obtain a closed-form expression for the transverse shear modulus of transversely isotropic nanoporous materials. Using the transverse shear modulus of a nanoporous material along with the other effective elastic properties, an energy-type overall yield function for such a nanoporous material is derived. Additionally, performing numerical examples for various loading cases, it is shown that the surface stress has a significant influence on the yield surfaces of the nanoporous material comprised of compressible/incompressible matrices, especially for voids radii less than 10 nm
  6. Keywords:
  7. Cylindrical nanovoids ; Nano-voids ; Nanoporous materials ; Surface energy ; Surface stress ; Yield function ; Elastic moduli ; Elasticity ; Interfacial energy ; Mechanical properties ; Nanopores ; Plasma interactions ; Porous materials ; Stress analysis ; Surface chemistry ; Surface properties ; Yield stress
  8. Source: Mechanics of Materials ; Volume 42, Issue 9 , September , 2010 , Pages 852-862 ; 01676636 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0167663610000967