Electromagnetic incremental assembly for large thin-walled ring shells and microscopic mechanisms of dynamic deformation overlap regions
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Date
2025-08
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Abstract
This paper introduced an electromagnetic incremental assembly (EMIA) method which
employed large thin-walled aluminum alloy ring shells as the processing object and a
weak rigidity assembled structure with an irregular cross-section as the support object. By
experiments, the effects of discharge frequency, discharge voltage, and coil position
parameters on the assembly outcome were investigated. The results show that this method
successfully achieved a tight fit between the skin and the assembled structure, as well as
effective support. During the EMIA, there were many two-step dynamic deformation overlap
regions. This paper also conducted an in-depth study on the microstructure evolution of
these deformation overlap regions, revealing that dynamic pre-forming enhanced the
strength and plasticity of the material. The enhanced strength was attributed to the higher
dislocation density within grain boundaries. The plasticity enhancement was mainly due to
two factors: firstly, the more uniform dislocation distributions which promoted
homogeneous deformation; secondly, the shear stress on the second-phase particles became
more concentrated, and the shear action was enhanced. As a result, a large number of
original particles were sheared into multiple segments, and large-scaled particles were also
fractured, leading to the accumulation of dislocations that eventually cut through the
particles, releasing local shear stress.
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Keywords
Large thin-walled ring shells, Microstructure evolution, Electromagnetic incremental assembly
Subjects based on RSWK
Elektromagnetisches Verfahren, Fertigung, Aluminium, Legierung, Mikrostruktur, Experiment, Deformation, Korngrenze