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extrusion
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Comparison of Mechanical Properties of Al-TiB2 Composite in as Cast, Heat Treated and Extruded Condition
, M.Sc. Thesis Sharif University of Technology ; Varahram, Naser (Supervisor) ; Davami, Parviz (Supervisor)
Abstract
This research focused on mechanical properties of Al-TiB2 composite in as cast, heat treated and extruded condition. The composites were produced by mixing Al-Ti and Al-B master alloyes. Since some engineering parts during service are supposed to tolerate severe wear conditions, in this research abrasive wear condition was wxamined using pin on disk method. In a fixed load and abrasive disk, composites showed better resistance against wear in comparison with matrix alloy. Furtheremore, T6 heat treatment made composites more resistant against abrasive wear. Finally the best wear resistance was accompolished when composite was extruded and then heat treated. While increase in reinforcement...
Optimization of the Positions of Holes in Multi-hole Extrusion Dies with Unsymmetrical Holes for Minimization of the Curvature of the Exiting Profile
, M.Sc. Thesis Sharif University of Technology ; Assempour, Ahmad (Supervisor)
Abstract
In this study, a two-hole die with unsymmetrical T-shape holes has been investigated. At first, a kinematically admissible velocity field in outlet of die has determined. Then, appropriate length of die has calculated by upper bound method. Finally, suitable position of holes has achieved in aspect of minimum pressure and curvature. To calculate curvature of exit profile, a realistic deviation function has been defined. To validation of results, finite element simulation and physical modeling have been used. Analytical, experimental and finite element results have decent agreement to each other
Preparation and Forming of Nerve Growth Channels from Polymeric Nanocomposite by Solution Extrusion and Studing their Properties
, M.Sc. Thesis Sharif University of Technology ; Ramazani Saadatabadi, Ahmad (Supervisor)
Abstract
The nervous system is the most complex body system and controls other body systems. Damages of the peripheral nervous system will interfere with the functioning of the body. Tissue engineering is used as one of the most effective methods for repairing damaged tissues,by providing 3-dimensional (scaffold) bedding with proper properties, allows the proliferation of Myelin sheath and proliferation of axons. In this study, we used a continuous extrusion process, sodium alginate with different percentages of Polyaniline-Graphene nanoparticle (synthesized by solvent emulsion) was extruded and its properties were determined by FTIR, SEM, MTT, tensile properties, Conductivity, contact angles and...