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cold-bonding
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Manufacturing of Composite and Nanostructured Thin Walled Tubes by ASB Process
,
M.Sc. Thesis
Sharif University of Technology
;
Akbarzadeh, Abbas
(Supervisor)
Abstract
In this study, utilizing the so-called “flow forming”, a cold-bonding process is developed to produce multi-layered thin-walled tubes and cylinders. In this process, which is entitled as “spin-bonding”, two layers of tubes are bonded by thickness reduction. Al/Al and Cu/Al tubes were bonded at various temperatures, thickness reductions, feed rates and roller attack angles. The bonding quality was examined by peel test, metallography and SEM fractography. Moreover, spin-bonding was accumulatively applied to aluminum tubes up to 4 cycles as a severe plastic deformation (SPD) for thin-walled tubes and cylinders entitled as “Accumulative Spin-Bonding” (ASB). Beside of experimental works,...
Fabrication of copper/aluminum composite tubes by spin-bonding process: Experiments and modeling
, Article International Journal of Advanced Manufacturing Technology ; Volume 54, Issue 9-12 , November , 2011 , Pages 1043-1055 ; 02683768 (ISSN) ; Akbarzadeh, A ; Sharif University of Technology
2011
Abstract
The aim of this work is to produce two layered thin-walled Cu/Al composite tube by the spin-bonding process. The process is utilized to bond the aluminum tube into the copper one at thickness reductions of 20-60% and process temperatures of 25°C, 130°C, and 230°C. The bond strength is measured by T-peeling test, and the bond interfaces are examined by metallography and scanning electron microscopy (SEM). The results show that after a threshold thickness reduction of about 30%, the bond strength increased with the amount of deformation. SEM fractography of the peel surfaces confirms that the copper oxide film is broken in a shear manner during deformation. Severe shear strains applied during...
A novel spin-bonding process for manufacturing multilayered clad tubes
, Article Journal of Materials Processing Technology ; Volume 210, Issue 3 , 2010 , Pages 510-517 ; 09240136 (ISSN) ; Akbarzadeh, A ; Sharif University of Technology
2010
Abstract
Utilizing the so-called tube spinning, a cold-bonding process entitled as "spin-bonding" is developed to produce seamless thin-walled clad tubes and cylinders. By this method, two layers of AA 1050 tubes were successfully bonded together to form a clad tube at room temperature. Based on mechanical aspects of the tube spinning process, the mechanism of spin-bonding is explained in two stages: surface preparation before occurrence of a stable bond and bond strengthening thereafter. The effects of process temperature, thickness reduction, feed rate and roller attack angle as the parameters of tube spinning on the bond strength are studied. It is shown that the bond strength increases by...