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    Relationship between young’s modulus and planar density of unit cell, super cells (2 × 2 × 2), symmetry cells of perovskite (catio3) lattice

    , Article Materials ; Volume 14, Issue 5 , 2021 , Pages 1-15 ; 19961944 (ISSN) Rabiei, M ; Palevicius, A ; Nasiri, S ; Dashti, A ; Vilkauskas, A ; Janusas, G ; Sharif University of Technology
    MDPI AG  2021
    Calcium titanate-CaTiO3 (perovskite) has been used in various industrial applications due to its dopant/doping mechanisms. Manipulation of defective grain boundaries in the structure of perovskite is essential to maximize mechanical properties and stability; therefore, the structure of perovskite has attracted attention, because without fully understanding the perovskite structure and diffracted planes, dopant/doping mechanisms cannot be understood. In this study, the areas and locations of atoms and diffracted planes were designed and investigated. In this research, the relationship between Young’s modulus and planar density of unit cell, super cells (2 × 2 × 2) and symmetry cells of nano... 

    Exact electroelastic field of a functionally graded piezoelectric cantilever beam subjected to pure body force loading

    , Article ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010, 12 July 2010 through 14 July 2010 ; Volume 2 , 2010 , Pages 45-52 ; 9780791849163 (ISBN) Emami, A. A ; Hashemi, R ; Kargarnovin, M. H ; Naghdabadi, R ; Sharif University of Technology
    The electroelastic response of functionally graded piezoelectric cantilever beams which includes the effect of body force is presented in this paper. The material properties such as elastic compliance, piezoelectric and dielectric impermeability are assumed to be graded with different indices in the thickness direction according to exponential distributions. Systems of fourth order inhomogeneous partial differential equations (PDEs) which are satisfied by the stress and induction functions and involve the body force terms are derived. Spectral forms for electrical and mechanical variables in the x-axis are employed to convert the partial differential governing equations and the associated... 

    Measurement modulus of elasticity related to the atomic density of planes in unit cell of crystal lattices

    , Article Materials ; Volume 13, Issue 19 , 2020 , Pages 1-17 Rabiei, M ; Palevicius, A ; Dashti, A ; Nasiri, S ; Monshi, A ; Vilkauskas, A ; Janusas, G ; Sharif University of Technology
    MDPI AG  2020
    Young’s modulus (E) is one of the most important parameters in the mechanical properties of solid materials. Young’s modulus is proportional to the stress and strain values. There are several experimental and theoretical methods for gaining Young’s modulus values, such as stress–strain curves in compression and tensile tests, electromagnetic-acoustic resonance, ultrasonic pulse echo and density functional theory (DFT) in different basis sets. Apparently, preparing specimens for measuring Young’s modulus through the experimental methods is not convenient and it is time-consuming. In addition, for calculating Young’s modulus values by software, presumptions of data and structures are needed....