Numerical Simulations of the Kolsky Compression Bar Test

Technical Report · Thu Oct 01 04:00:00 EDT 2015

DOI:https://doi.org/10.2172/1226520· OSTI ID:1226520

Corona, Edmundo ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

The Kolsky compression bar, or split Hopkinson pressure bar (SHPB), is an ex- perimental apparatus used to obtain the stress-strain response of material specimens at strain rates in the order of 10 ² to 10 ⁴ 1/s. Its operation and associated data re- duction are based on principles of one-dimensional wave propagation in rods. Second order effects such as indentation of the bars by the specimen and wave dispersion in the bars, however, can significantly affect aspects of the measured material response. Finite element models of the experimental apparatus were used here to demonstrate these two effects. A procedure proposed by Safa and Gary (2010) to account for bar indentation was also evaluated and shown to improve the estimation of the strain in the bars significantly. The use of pulse shapers was also shown to alleviate the effects of wave dispersion. Combining the two can lead to more reliable results in Kolsky compression bar testing.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 1226520
• Report Number(s): SAND2015--8958; 608237
• Country of Publication: United States
• Language: English