A New Experimental Technique for Applying Impulse Tension Loading
Loading...
Date
2016-04-27
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
This paper deals with a new experimental technique for applying impulse tension loads.
Briefly, the technique is based on the use of pulsed-magnetic-driven tension loading.
Electromagnetic forming (EMF) can be quite effective in increasing the forming limits of
metal sheets, such as aluminium and magnesium alloys. Yet, why the forming limit is
increased is still an open question. One reason for this is the difficulty to let forming
proceed on a certain influence monotonically: the main phenomena causing this increase
in formability are considered to due to “body force” effect, inertia effect, changes in strain
rate sensitivity. In this study, an impulse tension loading setup is presented. “Body force”
effect and strain rate, which are known to be the two key factors leading to higher
formability, can now be separated freely by our designed device. Reproducible and
adjustable loading rate (80s-1~3267s-1) can be achieved by adjusting the discharge
voltage and capacitance. The relation between the discharge voltage and strain rate was
obtained with the help of finite element calculations and high-camera measurement results.
The results of an exploratory experiment carried out on the designed device are presented
for aluminum alloy AA5052 sheet. It shows that this technique could be used to study the
dynamic response of sheets.
Description
Table of contents
Keywords
electromagnetic forming, tension loading, forming limit