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Elasto-Plastic Design of Thick-Walled FG Vessels under Pressure or Temperature Gradient Loadings

Mansoupour Bonab, Hojjat | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44273 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Kargarnovin, Mohammad Hossein
  7. Abstract:
  8. Nowadays functionally graded materials have many applications in various industries. One of these applications can be the manufacturing of thick-walled vessels. Thick-walled vessels under internal pressure and high temperatures gradient require materials with higher strength, like Functionally Graded Materials (FGM) and can be reinforced by some mechanical processes like autofrettage. In this process under certain loading some part of vessels enters into plastic zone and upon unloading some residual stresses will be generated. Moreover it is very important to find out the depth of this plastic zone, In addition, minimizing the stress distribution vs. depth of plastic zone under applied working pressure or temperature is another important issue to be studied. One of the main aims of this study is to find the depth of plastic zone in the autofrettage process such that the final stress distribution becomes optimized.Additionally, the other goal in this study is to design an autofertage process and define a final loading for spherical and cylindrical vessels under pressure or temperature gradient to minimize the hoop stress distribution. In doing so, primarily, for either of cylindrical or spherical vessels and under any types of loadings, the stress analyses of autofrettage process is done then by applying the working pressure and temperature one at a times, the final stress distributions are obtained. In the next step by using of these results and under the maximum final stresses, the best autoferttage process and the maximum sustainable loading of reinforced vessels are obtained. Finally, for validation, the obtained results have been compared with some other studies especially with those vessels made of isotropic materials
  9. Keywords:
  10. Autofrettage Process ; Elastoplastic ; Functionally Graded Materials (FGM) ; Elasto-Plastic Analysis ; Pressure Loading ; Temperature Gradient ; Thick-Walled Vessels

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