Design of Electromagnetic Pulse Crimp Torque Joints
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Date
2014
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Abstract
Electromagnetic pulse crimping of form fit joints was investigated using tubes with a
diameter of 50 mm and a wall thickness of 1,5 mm, in the aluminium alloy EN AW-6060.
The tubes were crimped onto steel internal parts, which were designed to bear torsional
loads. Grooved, knurl rolled and knurl cut internal workpieces were used. To assess the
torque strength of the connections, a torque test set-up was designed and built.
In a first test series, grooved internal parts were used. The influence of the internal
workpiece design and the energy level on the torque resistance was investigated. Related
to the geometry of the internal workpiece, the following parameters were varied: the
groove depth, the groove width, the edge radius and the number of grooves.
In a second test series, knurl rolled and knurl cut internal workpieces were used. For the
joints with a knurl rolled internal part, the influence of the knurl pattern, defined by the
pitch, was investigated. For the connections with a knurl cut internal part, the influence of
the energy level was studied. The different joint failure mechanisms were determined.
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Keywords
electromagnetic pulse joining, failure mechanisms, Torque crimp joints