د.علاء محمد حسين محسن الجصاني

Tube drawing are one of the most important forming processes manufacturing whole board. This process suffers from many problems regarding the deformation behavior of the tube material, as there is no control on the inner radius, i.e. wall thickening and failure at the end. This research involved implementing analytical and numerical simulation to investigate the ability of the tube to resist the failure under applied forces. The mathematical analysis was performed using Tresca yield criterion and the basis of force equilibrium to a representative element in the deformation zone, as it being drawn into the die under quasi-static equilibrium. Explicit dynamic analysis to the tube drawing process was performed using ANSYS 19.2 Workbench program. The analytical solution was used to validate the finite element results obtained from ANSYS program. Two types of material used in this analysis. The die material is made by 304 stainless steel. However, AL2024T351 was selected as tube material. The developed longitudinal stress and the thickness strain drawing process of the tube through conical die are studied. Investigated parameters that can affect the deformation behavior are taken into account. Such as, the die semi-angle .

The present work deals with the concept of application of ECAP onto commercial Cu-30Zn brass alloy in order to develop the microstructure, mechanical and wear properties. In this regard, specific die for ECAP process with constant parameters has been developed to severely deform brass alloy at room temperature using three passes with route C and lubricating conditions. The microstructure of as-received and ECAP-deformed brass alloy samples were characterized using optical microscope. Micro-hardness and tensile tests were carried out to estimate the mechanical properties of as-received and ECAP processed brass alloy sample. Furthermore, the wear characteristics of investigated brass alloy samples were analyzed using dry sliding wear test at room temperature. The results showed that a significant grain refinement in the microstructure of ECAP deformed brass samples was achieved compared to initial brass alloy. The micro-hardness and mechanical tensile strength were also increased markedly after ECAP process compared to initial brass alloy. Moreover, the wear resistance of ECAP processed brass sample increased significantly after three passes of ECAP compared to initial brass alloy.

Strengthening of materials with advanced techniques became very necessary to face the great developments taking place in various engineering applications. In recent years, materials with grain refinement, by severe plastic deformation (SPD) using different methods and techniques, have taken great interest. Equal channel angular pressing (ECAP) process is one of the most effective SPD techniques for producing materials with highly decreased grain size and outstanding properties. The present article discusses the effect of ECAP process on the microstructure, mechanical and wear properties of aluminum(Al)and cupper(Cu)alloy, the most common materials used for many industerial applications.