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Interlaminar Stresses Analysis of Spherical Shell with Arbitrary Laminations and Boundary Conditions under Transverse Loads

Feizabadi, Homa | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51980 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Hosseini Kordkheili, Ali
  7. Abstract:
  8. Today, composites are widely used in various industries, thus the study and analysis of properties and their behaviors are very important. In addition, the use of multi-layered composites in the aerospace industry is important. The composite-elastomer structures, specially their spherical shape, are widely used as flexible joint in aerospace industries, such as the thrust vector control system in solid-propellant rockets and the helicopter industry. In this study, an analytical approach is proposed for calculating the interlaminar stresses of laminated plates and spherical shells with arbitrary laminations and boundary conditions based on a threedimensional multi-term extended Kantorovich method (3DMTEKM). In present analysis, laminated plates and spherical shells are considered with finite dimensions and full three-dimensional interlaminar stresses in the interior and the boundary-layer regions are calculated. By using the principle of minimum total potential energy and the displacement field that considering in present 3DMTEKM, three systems of coupled ordinary differential equations with non-homogeneous boundary conditions are obtained. Then, by using an iterative process based on the present method, an analytical solution is obtained. Finally, the present results are compared and validated with the results of FEM method. The results of this analytical solution predict well the 3D behavior of stresses near the free edge. The proposed solution can be provided for general types of loading, lay-up and different boundary conditions
  9. Keywords:
  10. Free Edge Effect ; Interlaminar Stress ; Multilayered Composite ; Composite Laminated Spherical Shells ; Extended Kantorovich Method ; Different Boundary Conditions

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