|About this Abstract
||NUMISHEET 2022: The 12th International Conference on Numerical Simulation of 3D Sheet Metal Forming Processes
||Modelling Transient Mechanical Behavior of Aluminum Alloy during Electric-assisted Forming
||Jai Tiwari, Hariharan Krishnaswamy, Murugaiyan Amirthalingam
|On-Site Speaker (Planned)
Electric-assisted forming is a promising technique in which the mechanical behavior of the materials is altered by the application of electric current during deformation. Advantages of electric-assisted forming include improved ductility, reduction of flow stress and springback. The alteration in the mechanical behavior is in general linked to Joule’s heating due to a lack of comprehensive understanding of the mechanism of electric-assisted deformation. Significant efforts are being made in the field of electroplasticity to propose the existence of additional mechanisms through which the electrical effects on deformation could be better explained by experimental and numerical approaches. However, a consensus is lacking on the governing mechanism and a generalized constitutive model for electroplastic deformation therefore is not yet established. In the present work, two models namely, Joule's heating based and dislocation density based are used to predict the mechanical behavior of aluminium alloy samples subjected to pulsed electric current. The dislocation density based model superposes the thermal and athermal mechanical behavior independent of the underlying mechanism. Results indicate that an attempt to model the electroplastic behavior purely through Joule heating produces inconsistent results. It is shown that the Joule heating model can accurately predict either the temperature history or the mechanical behavior and not concurrently.
||Definite: At-meeting proceedings