Abstract: A computational efficiency method is presented to study the structure of a rocket fuel tank subjected to an internal pressure. The complete structure is divided into a number of substructures that can be analyzed separately by the displacement method. Finally, using the simultaneous relaxation of the substructures boundary, we find the actual displacements and hence, the values of stresses in the tank structure. Evidently, the solution of the boundary displacements involves a considerably smaller number of unknowns compared with the solution for the complete structure without partitioning. A numerical example proves the advantages of this proposed method based on the techniques of Finite Element Method (FEM). Using a program written in MatLab language, we determine the stresses in the tank structure and study its stability.

Brief Biography of the Speaker:
Olga Martin graduated the Faculty of Mathematics and Mechanics, University of Bucharest, Romania. She received his PhD in mathematics with the specialization in Dynamic Plasticity with paperwork ‘Applications of the Finite Element Method in Dynamic Plasticity’. During of twenty years, she had been senior researcher in Aircraft Institute, Strength Materials Department. Technical experience: structural strength computing reports using ANSYS program (wing-fuselage, fuselage frame, fin, elevator, rudder and aileron), dynamic and static test-programs for aircraft structures, fatigue test-programs for aircraft structures, iterative methods for the study of the reactions, which correspond to movable control surfaces, attached at n – points to an elastic structure and program of this, static and fatigue computation of the propeller (mono-bloc hub, blades and blades retention system).
Nowadays, she is Professor, Applied Sciences Faculty, University Politehnica of Bucharest.
Fields of specialization: Mathematical Analysis, Mathematical Physics, Computational and Experimental Solid Mechanics, Numerical Analysis, Statistical Calculus. She has published over 80 research papers and 18 books. She is member of the editorial boards of Politehnica Sci. Bull. Series A, WSEAS Transactions on Applied and Theoretical Mechanics, WSEAS Transactions on Mathematics and she was involved in the program/organizing committees for many international conferences. Membership of Professional Societies Society of Computer Aided Engineering – Member National Union of Romanian Scientists (Founding member) Balkan Society of Geometers, member. Reviewer: WSEAS Press (books and journals), Scientific Bulletin, Politehnica University of Bucharest Scientific Evaluation Societies: RELANSIN, Politehnica University of Bucharest, ARACIS, Bucharest, National Science Fund of Bulgaria.