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Extraction of the Forming Limit Diagram in Magnesium Microtubes Used in Stents by Modeling the Hydroforming Process in Abaqus Finite Element Software

Reisi, Mahdi | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56858 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Assempour, Ahmad
  7. Abstract:
  8. One of the common methods of removing blood clots is angioplasty with stents. Due to the fact that the mechanical properties of the stent are directly related to the microtube it is made of. Therefore, investigating the mechanical properties of microtubes is very important. One of the ways used to evaluate the plasticity of microtubes; Drawing a graph is the limit of shaping. The purpose of this research is to extract the forming limit diagram of magnesium microtube by simulating the hydroforming process in Abaqus software. First, in order to confirm the modeling, the hydroforming process for aluminum has been simulated and compared with the existing experimental results. The comparison shows that the good conformity of the results indicates the proper modeling of the hydroforming process. Since magnesium is an anisotropic material, the anisotropy coefficients of magnesium have been extracted using crystal-plastic relationships (in Damask algorithm) as a subprogram in Abaqus software (UMAT) on the representative volume element (RVE). In this process, the effect of tissue intensity is also considered. The results show that the relative activity range of the main slip systems, such as pyramidal slip and prismatic slip, is higher in the direction of extrusion than in other directions, so the anisotropy coefficient obtained in the direction of extrusion is higher than in other directions. As the tissue intensity decreases, the anisotropy coefficients approach one and the forming limit curve increases, and as the tissue intensity increases, the forming limit curve shows a lower safe area
  9. Keywords:
  10. Forming Limit Diagram (FLD) ; Anisotropy ; Representative Volume Element ; Crystalline Plasticity ; Magnesium Microtube ; Tube Hydroforming ; ABAQUS Software

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