Material Behavior

Challenges in Assessing the Precision of High Strain Rate Testing for UHPC

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Abstract

High strain rate testing of UHPC is commonly performed using the split-Hopkinson pressure bar (SHPB). Past SHPB testing has shown considerable scatter in the dynamic strengths achieved. To determine how much of this variation is due to the material, and how much is introduced by the SHPB, a Gage R&R study was performed. If a significant amount of variation is introduced by the SHPB itself, that raises questions about the value of using or making comparisons with data collected with the SHPB. Applying Gage R&R to a destructive measurement technique presents several challenges because repeat measurements are not possible. The use of alternate study setups was considered. However, it is inevitable that some material variance will be attributed to the measuring system. The Gage R&R will therefore give an upper bound on the measurement error. Gage R&R analysis was also applied to data from wood and normal strength concrete tests on the same SHPB instrument. By using materials with reduced variability, a more realistic estimate of measurement error was obtained.

Keywords: Gage R&R, SHPB, ductal, Cor-Tuf, measurement system analysis

How to Cite:

Groeneveld, A. B. & Ahlborn, T. M., (2016) “Challenges in Assessing the Precision of High Strain Rate Testing for UHPC”, International Interactive Symposium on Ultra-High Performance Concrete 1(1). doi: https://doi.org/10.21838/uhpc.2016.70