Split Hopkinson Bar
Split Hopkinson Pressure Bar (SHPB) testing is one of the most versatile methods for determining dynamic mechanical properties at high strain rates in the range of 1×102 – 1×105 s-1. Suitable configuration of the SHPB test setup allows testing of specimens to generate the respective stress-strain curves.
In the compression test, a small cylindrical specimen is clamped between two long, identical and high-strength steel bars, called the loading and transmission bars. The free end of the loading bar is hit axially by a projectile fired from a gas pistol. The approximately flat-pointed longitudinal tension pulse generated by the impact travels along the loading rod to the specimen, where it is partly reflected and partly transmitted.
Strain gauges on each bar monitor strains due to the incident pulse, reflected pulse, and transmitted pulse as functions of time. A high-bandwidth bridge amplifier such as the Elsys SGA2 is required to measure the signal from the strain gauge. A TraNET FE with a sampling rate of 2 MS/s per channel or higher is suitable for acquiring the measurement signals.
SGA-2Bridge amplifier for highly dynamic measurements with strain gauges for 1/4, 1/2 or full bridge circuits.More
LNA-2Differential, low-noise amplifier with two gain stages of x10 and x100 with a maximum bandwidth of 20 MHz.More
TraNET® FE 4048 to 16 channel high-speed data acquisition device with Ethernet connection and integrated hard disk.More
TraNET® FE 408 DPDust-proof data acquisition unit with up to 32 channels and programmable IEPE/ICP power source on all channels.More
TranAX® Universal DAQ Software
The TranAX® 4 data acquisition software turns your measurement hardware into a measurement solution. With TranAX® you get the maximum out of the Elsys measurement hardware:
- Easy configuration of channel and trigger settings, display of waveforms in customizable waveform displays, even of very large data sets.
- Various scalar-functions and an integrated formula editor for calculations are available for post processing analysis.
- Repetitive sequences can be automated with the help of the measurement flow control.
- For measurement reports TranAX has a documentation window to create printable reports.
- For further data processing, the measurement data can be exported to Matlab, Python or other programming languages and tools.