Abstract:
This work consists of designing and fabricating of compression split Hopkinson pressure bar
(SHPB) apparatus to investigate the high strain rate stress-strain behavior of low carbon steel at
strain rates of 217.686 s-1, 283.728 s-1, and 356.692 s-1. High strain rate mechanical behavior at the
aforementioned regime has never been studied in Sri Lanka; notably with SHPB apparatus. High
strain rate behavior of materials is essential in designing mechanical components to be used in
high loading impact components such as sports equipment, automotive applications and ballistic
applications. General mechanical behavior analogies used for quasi static regime such as universal
tensile testing machine are inaccurate and inadequate in dealing with high strain rate related
studies.
A test bench, loading device, an incident bar, a transmission bar, bar holders, a momentum trap,
and standard specimens were fabricated. Two data acquisition and recording systems were used
for collecting data from the incident bar and the transmission bar with a maximum sampling rate
of 428571 Hz. The data acquisition and recording system components were strain gauges, a
Wheatstone bridge circuit, an amplifier, a microcontroller, a power supply, a USB hub, and a USB
to micro-B cable and computer. Software codes were developed to collect the data and process the
experimental data and determine the corresponding flow curves. In further work on this area, it
was recognized to use much more accurate strain gauges suitable for the high strain rate
applications so that the data will be more accurate and efficient.
Citation:
Edirisinghe, D.J., Nidushan, N.D., & Abeygunawardana, A.A.G.A. (2021). Design and fabrication of split Hopkinson pressure bar apparatus to investigate high strain rate mechanical behavior of low carbon steel [Abstract]. In A.A.G.A. Abeygunawardane (Ed.), Innovative materials through mathematical modeling and simulations (p. 1). Department of Materials Science and Engineering, University of Moratuwa.