Development of Vibration During the Electromagnetic Ring Expansion Test
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Date
2016-04-27
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Abstract
Magnetic pulse forming (MPF) techniques work on the principle of Lorentz force induced
by eddy current which can cause plastic deformation in a metal workpiece. Lorentz force
depends on parameters such as frequency and amplitude of input current, electromagnetic
properties of materials and distance between the work piece and coil. The development of
vibration as a consequence of elastic strain recovery in a ring expansion process using a
MPF technique has been identified and presented in this paper. Coupled mechanicalelectromagnetic
3D simulations were carried out to investigate the effect of various
magnetic pulse currents in the development of reversal of motion during the MPF process
using LS-DYNA package. Ring expansion using a multi-turn helix coil with an applied
pulse current, with the rings made of aluminum alloy AA6061 –T6 is investigated for the
effect of vibration during the process. The numerical results show good agreement with
the experimental work for various currents. The underlying principle of vibration and
formability has respectively been studied using force analysis and stress analysis. The
results also show that the 5.6kJ energy already increased the formability by ~66 percent in
comparison with the quasi-static formability value from the literature.
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Keywords
magnetic pulse forming, ring expansion, elastic strain recovery