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Steel and Composite Structures
  Volume 36, Number 6, September25 2020, pages 631-642
DOI: http://dx.doi.org/10.12989/scs.2020.36.6.631
 


Strain gradient based static stability analysis of composite crystalline shell structures having porosities
Raad M. Fenjan, Nadhim M. Faleh and Ahmed A. Ridha

 
Abstract
    This paper studies nonlinear stability behavior of a nanocrystalline silicon curved nanoshell considering strain gradient size-dependency. Nanocrystallines are composite materials with an interface phase and randomly distributed nano-size grains and pores. Imperfectness of the curved nanoshell has been defined based on an initial deflection. The formulation of nanocrystalline nanoshell has been established by thin shell theory and an analytical approach has been used in order to solve the buckling problem. For accurately describing the size effects related to nano-grains or nano-pores, their surface energies have been included. Nonlinear stability curves of the nanoshell are affected by the size of nano-grain, curvature radius and nano-pore volume fraction. It is found that increasing the nano-pore volume fraction results in lower buckling loads.
 
Key Words
    nanocrystalline material; nonlinear stability; porous nanoshell; Strain gradient; Mori-Tanaka scheme
 
Address
Raad M. Fenjan, Nadhim M. Falehand Ahmed A. Ridha: Al-Mustansiriah University, Engineering Collage P.O. Box 46049, Bab-Muadum, Baghdad 10001, Iraq
 

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