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  • Towards understanding the fundamentals of electric-assisted deformation for enhanced formability of metallic materials
Towards understanding the fundamentals of electric-assisted deformation for enhanced formability of metallic materials

Towards understanding the fundamentals of electric-assisted deformation for enhanced formability of metallic materials

Date17th Feb 2022

Time02:30 PM

Venue Through Google Meet: https://meet.google.com/rfn-jtpt-vev

PAST EVENT

Details

Electric-assisted forming is one of the advanced forming technologies which offers improved formability, reduction in spring-back and time-efficient forming. The improved formability in electric-assisted forming has been attributed in the past to various phenomenon namely Joule’s heating, electron wind effect and dislocation depinning. The governing mechanism of electroplasticity still lacks consensus. To investigate electric-assisted deformation phenomena, uniaxial compression tests with the application of constant amplitude direct current were performed on different microstructures of AA 6063 and its nanocomposites. Significant reduction in forming force was observed in all the cases. This forming force reduction is due to the combined effects of thermal softening and an independent electron-dislocation interaction. High temperature isothermal tests were further used to decouple the thermal effect and electroplastic effect. To further understand the mechanisms responsible for reduction in forming force, XRD analysis of the samples was carried out. The results confirm that the observed effect is due to the occurrence of two parallel mechanisms namely thermal softening and dislocation depinning. To understand the physical mechanisms, it is pertinent to model the electoplastic behavior as the superposition of rate dependent and rate independent components. In this model, electric assisted deformation phenomenon is simulated using the dislocation density based constitutive approach and implemented into finite-element software ABAQUS® using user material subroutines. It is demonstrated that the implemented model simulate the experimentally obtained forming behavior of aluminum alloy with acceptable accuracy in both the continuous and pulsed current conditions.

Speakers

Mr. Jai Tiwari (ME18D006)

Department of Mechanical Engineering