Development Of A Portable Low Strain Rate Testing Machine
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Date
2022-07-18
Authors
Munusamy, Sharven
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Slow strain rate testing, is important in understanding the mechanical
behaviour of material. It entails applying a slow dynamic strain with a constant
extension rate to a specimen. Typical Universal Tensile Machine (UTM) can be used
to determine the strain rate of a material. However, a machine that can couple low and
high strain rate testing at a reasonable cost is usually not easily accessible. Therefore,
this paper attempts to propose a design of concept that can be used in a high strain rate
testing machine as well as to independently conduct low strain rate testing. Critical
components such as the spring nut holder, pulling rod, moving grip holder and
stationary grip holder were designed and fabricated. Whereas the frame which holds
these components in place was reused from the machine part. A testing was done to
verify that the prototype can perform as it is intended by comparing results with a
UTM Gunt machine. The extension curve of the both machine and prototype were
similar and the prototype was rigid (did not endure significant bending during the test).
Finally, a scheme to connect to a SHPB machine to allow high strain and low strain
testing capability on a unique SHPB setup was proposed.