A STUDY ON THE NONLINEAR STABILITY OF ORTHOTROPIC SINGLE-LAYERED GRAPHENE SHEET BASED ON NONLOCAL ELASTICITY THEORY

Authors

  • SAEID REZA ASEMI DEPARTMENT OF ENVIRONMENT, DAMAVAND BRANCH, ISLAMIC AZAD UNIVERSITY, DAMAVAND, IRAN
  • MOSLEM MOHAMMADI DEPARTMENT OF ENGINEERING, AHVAZ BRANCH, ISLAMIC AZAD UNIVERSITY, AHVAZ, IRAN.
  • ALI FARAJPOUR YOUNG RESEARCHERS AND ELITES CLUB, NORTH TEHRAN BRANCH, ISLAMIC AZAD UNIVERSITY, TEHRAN, IRAN

Keywords:

POSTBUCKLING, ORTHOTROPIC NANOPLATES, SMALL SCALE EFFECT, NONLOCAL PLATE THEORY

Abstract

RECENTLY, GRAPHENE SHEETS HAVE SHOWN SIGNIFICANT POTENTIAL FOR ENVIRONMENTAL ENGINEERING APPLICATIONS SUCH AS WASTEWATER TREATMENT. IN THE PRESENT WORK, THE POSBUCKLING RESPONSE OF ORTHOTROPIC SINGLE-LAYERED GRAPHENE SHEET (SLGS) IS INVESTIGATED IN A CLOSED-FORM ANALYTICAL MANNER USING THE NONLOCAL THEORY OF ERINGEN. TWO OPPOSITE EDGES OF THE PLATE ARE SUBJECTED TO NORMAL STRESSES. THE NONLOCALITY AND GEOMETRIC NONLINEARITY ARE TAKEN INTO CONSIDERATION, WHICH ARISES FROM THE NANOSIZED EFFECTS AND MID-PLANE STRETCHING, RESPECTIVELY. NONLINEAR GOVERNING DIFFERENTIAL EQUATIONS (NONLOCAL COMPATIBILITY AND EQUILIBRIUM EQUATIONS) ARE DERIVED AND PRESENTED FOR THE AFOREMENTIONED STUDY. GALERKIN METHOD IS USED TO SOLVE THE GOVERNING EQUATIONS FOR SIMPLY SUPPORTED BOUNDARY CONDITIONS. IT IS SHOWN THAT THE NONLOCAL EFFECT PLAYS A SIGNIFICANT ROLE IN THE NONLINEAR STABILITY BEHAVIOR OF ORTHOTROPIC NANOPLATES. UNLIKE FIRST AND SECOND POSTBUCKLING MODES, NONLOCAL EFFECTS DECREASE WITH THE INCREASE OF LATERAL DEFLECTION AT HIGHER POSTBUCKLING MODES. IT IS ALSO OBSERVED THAT THE NONLOCALITY AND NONLINEARITY IS MORE PRONOUNCED FOR HIGHER POSTBUCKLING MODES.

Published

2014-04-29

Issue

Section

Articles