Browsing by Author "El-Zafrany, A. M."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Open Access Buckling and vibration analysis of functionally graded composite structures using the finite element method(Elsevier Science B.V., Amsterdam., 2009-06-30T00:00:00Z) Oyekoya, Oyedele O.; Mba, David; El-Zafrany, A. M.The authors [Oyekoya OO, Mba DU, El-Zafrany AM. Structural integrity of functionally graded composite structure using Mindlin-type finite elements. ICCES 2008:172(l): 1-6] have previously written a paper Oil Structural integrity of functionally graded composite (FGC) structure using Mindlin-type finite elements. In this paper, the Mindlin-type element and Reissner-type element have been further developed for the modelling of FGC plate Subjected to buckling and free vibration. The Mindlin-type element formulation is based on averaging Of transverse shear distribution over plate thickness using Lagrangian interpolation. The Reissner-type element formulation is based on parabolic transverse shear distribution over plate thickness using Lagrangian and Hermitian interpolation. The composite plate considered in this paper is functionally graded in the longitudinal direction only, but the FE code developed is capable of analysing composite plates with functional gradation in transverse and radial direction as well. This Study was able to show that the structural integrity enhancement and strength maximisation of composite Structures are achievable through functional gradation of material properties over the structure.Item Open Access Efficient fracture mechanics programming system for linear and non-linear problems using finite-element and boundary-element methods(1990-06) Al-Edani, Ameen Ahmed Nassar; El-Zafrany, A. M.An attempt has been made, in this work, to design an efficient, linear—elastic and elasto-plastic, fracture mechanics package based upon finite and boundary element methods. The package contains many useful facilities such as, pre- and post-processors, different types of loading including inertial and thermal loading, and different types of finite and boundary elements. New crack-tip elements, and efficient algorithms for the analysis of J-integrals, have been derived. Elasto-plastic boundary element programs with different types of loading, and using a new subregion facility have also been developed. The package was employed for fracture mechanics analysis of some case studies with elastic, thermo-elastic, and elasto-plastic conditions, and with one and two modes of fracture. The results have proved that the package is very reliable and controllable, and new facilities and techniques, developed in this work, can provide useful tools for fracture mechanics analysis.