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Vibration Analysis of Spherical Structures and Open and Closed Rings Made of Functionally Graded Materials Using Spherical and Cylindrical Superelement

Fatan, Ali Reza | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47594 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Ahmadian, Mohammad Taghi; Firoozbakhsh, Keikhosrow
  7. Abstract:
  8. New developments have led to the creation of functionally graded materials which their unique property is continous changing in material properties. The increasing use of these materials has caused a lot of research on various issues related to them. One of the applications is applying these materials in spherical structures and open and closed rings. In mechanical equipment spherical structures and rings are used in various ways. The spherical structures of small parts, such as bearings to large structures such as spherical tanks are used. Due to the rapid growth of technology in the construction of structures of functionally graded materials, analysis of these structures in different shapes and made of various materials is of particular importance. The purpose of this study is vibration analysis of spherical structures and open and closed rings made of functionally graded materials. Analytical and numerical methods can be used for the analysis of these structures. Survey shows that analytical methods can not be used for many things and we have to use the numerical methods. In this context, finite element method using spherical and cylindrical superelement are used. Their advantage over the common elements are reduction in computation time and memory requirements with high accuracy. The analysis reveals that material composition and properties changes have significant effects on the structural behavior. The results confirm accuracy and speed of superelements used in this project
  9. Keywords:
  10. Vibrational Analysis ; Super Elements ; Rings ; Spherical Super Element ; Functionally Graded Materials (FGM)

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