ON THE STABILITY OF INTERNALLY PRESSURIZED THICK-WALLED SPHERICAL AND CYLINDRICAL SHELLS MADE OF FUNCTIONALLY GRADED INCOMPRESSIBLE HYPER-ELASTIC MATERIAL

  • YAVAR ANANI Tarbiat Modares University
  • GHOLAM HOSSEIN RAHIMI Tarbiat Modares University
Keywords: HYPERELASTICITY, INSTABILITY, FUNCTIONALLY GRADED MATERIAL, THICK SHELLS

Abstract

IN THIS PAPER, STABILITY ANALYSIS OF THICK-WALLED SPHERICAL AND CY-LINDRICAL SHELLS MADE OF FUNCTIONALLY GRADED INCOMPRESSIBLE HYPERE-LASTIC MATERIAL SUBJECTED TO INTERNAL PRESSURE IS PRESENTED. INSTA-BILITY POINT HAPPENS IN THE INFLATION OF ABOVE MENTIONED SHELLS AND IN THIS PAPER EFFECT OF MATERIAL INHOMOGENEITY AND SHELL THICKNESS HAS BEEN INVESTIGATED. EXTENDED OGDEN STRAIN ENERGY FUNCTION WITH VARIABLE MATERIAL PARAMETER IS USED TO MODEL THE MATERIAL BEHAVIOR. TO MODEL INHOMOGENEITY, WE ASSUME THAT MATERIAL PA-RAMETER VARIES BY A POWER LAW FUNCTION IN THE RADIAL DIRECTION AND INHOMOGENEITY FACTOR IS A POWER IN THE POWER LAW FUNCTION. ANA-LYTICAL METHOD IS USED TO FIND THE INTERNAL PRESSURE VERSUS HOOP EXTENSION RATIO RELATIONS IN EXPLICIT FORM FOR BOTH OF CYLINDRICAL AND SPHERICAL SHELLS AND THE NON-MONOTONIC BEHAVIOR OF THE INFLA-TION CURVES IS STUDIED. FOLLOWING THIS, PROFILE OF INFLATION PRESSURE VERSUS HOOP STRETCH IS PRESENTED AND EFFECT OF THE INHOMOGENEITY AND SHELL THICKNESS IN THE ONSET OF INSTABILITY IS STUDIED. THE OB-TAINED RESULTS SHOW THAT THE MATERIAL INHOMOGENEITY PARAMETER AND SHELL THICKNESS HAVE A SIGNIFICANT INFLUENCE ON THE STABILITY OF ABOVE MENTIONED SHELLS. THUS WITH SELECTING A PROPER MATERIAL INHOMOGENEITY PARAMETER AND SHELL THICKNESS, ENGINEERS CAN DESIGN A SPECIFIC FGM HOLLOW CYLINDER THAT CAN MEET SOME SPECIAL RE-QUIREMENTS.
Published
2018-02-05
Section
Articles