Investigating the effect of Texture Intensity on the Forming Limit Diagram of Magnesium Microtubes used in Stents using Crystal Plasticity Finite Element Modeling

Document Type : Article

Authors

1 Master's student, Faculty of Mechanical Engineering (Sharif University of Technology) Mirzakhani, Amin

2 Department of Mechanical Engineering, Payam Noor University, PO Box 3697-19395, Tehran, Iran

3 Professor, Mechanical Engineering Department, Sharif University of Technology, Tehran, Iran

Abstract

Metal microtubes are usually made using the extrusion method, eventually creating a special texture in the tube. The way tissue is created in the microtube has a significant effect on its mechanical properties, which is very effective in the quality of the fabricated stents. In this research, the effect of texture intensity caused by the extrusion process to make magnesium microtubes is extracted using the crystal plasticity finite element simulation process. First, to validate the modeling, the hydroforming process for aluminum has been simulated in Abaqus finite element software and compared with similar results in the literature. After confirming the modeling process, using the criterion of the second derivative of the maximum large strain for the hydroforming process, the forming limit diagram is drawn for magnesium without texture intensity. In order to confirm the modeling of crystal plasticity, the representative volume element was subjected to tension and compression, and the strain stress curve in tension and compression was compared with the experimental strain stress curve. Then, the representative volumetric element was subjected to tension in three directions of extrusion, perpendicular to extrusion and forty-five degrees, and by calculating the ratio of transverse strain to thickness strain, the anisotropy coefficient for the random state in these three directions was obtained. In the following, the anisotropy coefficient was obtained in three different tissue intensities as in the random state. The results show that the relative activity range of hard slip systems such as pyramidal slip and prismatic slip is greater in the direction of extrusion than in other directions, so the anisotropy coefficient obtained in the direction of extrusion is greater than in other directions. As the texture intensity decreases, the anisotropy coefficients approach one, and the formation limit curve increases. As the texture intensity increases, the formation limit curve shows a lower safe zone.

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References

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Sharif Journal of Mechanical Engineering
Volume 40, Issue 2 - Serial Number 2
December 2024
Pages 15-24

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