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Stress and Deformation Analysis of Metallic Flexible Corrugated Cylindrical Shells Under Internal Pressure

Shademani, Abolfazl | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56863 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Kouchakzadeh, Mohammad Ali
  7. Abstract:
  8. Thin-walled cylindrical shells are commonly used in various industries. One application of these structures is as liners for pressurized tanks (especially type III). One type of failure in these vessels is excessive plastic deformation in the shell. This can occur due to various loading conditions on the structure. Although the plastic deformations induced by each loading are limited, they can cause large permanent deformations and eventually lead to shell failure over repeated cycles. In high-risk industries, this issue can result in irreparable damage. By increasing the flexibility and deformability of the liner, the probability of liner failure due to entering the plastic region can be prevented. To design such a liner, the idea of expansion joints geometries can be utilized. In this research, the deformations of a metal cylindrical shell with a corrugated geometry and low thickness under internal pressure in the elastic region were investigated. For this purpose, a cylindrical shell with curvature in both circumferential and longitudinal directions was modeled and the maximum deformation sizes in the shell were examined by varying the geometric parameters of the induced curvature. Additionally, a composite shell sample was investigated considering the direction of the induced curvature in 4 cases. To allow for a comparison of the effect of the geometric parameters of the induced curvature on the amount of shell deformations before entering the plastic region, the analyses were performed at a constant stress (yield stress of the structure) in all cases. In general, the results indicate that circumferential curvatures lead to an increase in longitudinal deformations and longitudinal curvatures, causing an increase in radial deformations compared to a simple shell. The maximum size of the induced deformations in the corrugated shell corresponds to the circumferential case with an inward curvature. In this case, the curvature with a specific height, span length and number of corrugations induces an overall deformation more than 8 times greater than that of a simple shell
  9. Keywords:
  10. Thin Walled Cylindrical Shell Vibrations ; Expansion Joint ; Metallic Liner ; Type III Pressure Vessels ; Cylindrical Shells ; Corrugated Shell

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