Construction of Data Acquisition/Processing System for Precise Measurement in Split Hopkinson Pressure Bar Test

Abstract:

The Split Hopkinson Pressure Bar (SHPB) testing technique has been used to derive the constitutive equations of engineering materials at high strain rate using the reflected and transmitted waves measured from the input and output bars. In this case, a precise measurement of the reflected and transmitted waves is important to determine a reliable stress-strain relation. In this study, to achieve the precise measurement of the reflected and transmitted waves in the SHPB experiment, a data acquisition scheme utilizing the LabVIEW software and a post processing program have been constructed. With the constructed system, an accurate data acquisition without a digital storage oscilloscope and a convenient post processing of the signals obtained through the SHPB test for identifying the mechanical properties have been possible. Therefore, a fast and simple generation of the strain rate - time curve and the nominal stress - nominal strain curve has been implemented by just selecting the specified regions on the reflected and transmitted wave profiles acquired. Also, the process to set the appropriate test configuration in the SHPB test for various kinds of materials has become easy with the constructed system.

• Periodical: Applied Mechanics and Materials (Volume 566)
• Pages: 554-559
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.566.554
• Online since: June 2014
• Authors: Sang Hyun Lee*, Brian Jumaquio Tuazon, Hyung Seop Shin
• Keywords: Automated SHPB Test System, High Strain Rate, SHPB, Split Hopkinson Pressure Bar

References

[1] R. Hertzberg, Deformation and Fracture Mechanics of Engineering Material (John Wiley & Sons, Inc., USA 1996).

[2] M. A. Meyers, Dynamic Behavior of Materials(John Wiley & Sons, Inc., USA 1994).

[3] Information on http: /www. ni. com.