NUMERICAL ANALYSIS OF MECHANICAL BEHAVIOUR OF FGM USING FSDPT

Author

Prof. Rohan Gotty, Akshaya M, Keziah, Manasa N M


Abstract

 Functionally Graded Materials (FGMs) are advanced composites designed so that their material properties vary continuously between two surfaces. This removes any abrupt changes in the material causing FGMs to be ideal to use in high performance aerospace and structural applications. Due to the transverse pressure loading on FGM plates, transverse shear effects that occur are often ignored by using classical plate theories. This can cause problems when trying to determine how much the plate will deflect, the stresses in the plate and when/where failure will start to occur. This project looks at determining the static behaviour of rectangular FGM plates under transverse pressure. The First-Order Shear Deformation Plate Theory (FSDPT) has been used to incorporate the shear effect into the calculations. Equations have been derived and solved numerically using MATLAB. These have then been validated using Finite Element Models within ANSYS. Suitable failure criteria were then applied to find the failure points. The results show that varying the volume fraction of the material has a positive effect on the stiffness of the structure. The maximum deflection at the centre of the plate has decreased due to the increased stiffness. Stress contours show that the maximum stress is well managed throughout the plate. Finally the failure analysis shows exactly where failure occurs and at what pressure the plate will begin to fail. The FSDPT numerical model has been developed to accurately and efficiently analyze the pure mechanical response of an FGM plate and the pressure it can take before failure. This will provide valuable information when designing aerospace structures.


Keywords

Functionally Graded Materials (FGM), FSDPT, Static Analysis, MATLAB, ANSYS, Finite Element Analysis (FEA), Failure Analysis.



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References


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