Study on the Formability & Shape Confirmity of Mg & Al-alloy sheets in Warm condition by Electromagnetic Forming
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Date
2012-07-18
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Abstract
Electromagnetic forming is a high strain rate process used for shaping metals. Mg-alloys
are of interest by virtue of the light weight and potential for application in automotive
industries. These alloys have poor formability at room temperature and have to be formed
under warm working conditions. Simulations using COMSOL Multiphysics software were
carried out to predict the forming behavior of Mg-alloy sheets deformed at high speeds
and different temperatures into a die with a corrugated shape. Conformance of the sheet
to the die shape is the objective of this study. These sheets are assumed to be externally
heated to different temperatures prior to forming. Possible changes in the mechanical and
electrical properties of the material with temperature have been incorporated to show their
individual and combined effects. A virtual circuit was built to excite the coil, fully coupled
with the Solid Mechanics & Magnetic Fields, through related physics in the software.
Optimal parameters that ensure good conformance to die shape are sought as the
outcome of the simulation of warm electromagnetic forming of magnesium & aluminium
alloy sheets. The quality of strain distribution under different clamping constraints was
assessed using the strain non-uniformity index (SNI).
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Keywords
failure criteria, shape conformity, warm electromagnetic forming