Improving Hydrocode Models Using High Strain Rate Testing

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Authors
  1. Bolduc, M.
  2. Nandlall, D.
  3. Arsenault, R.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN)
Abstract
Hydrocode simulation uses constitutive models that are mathematical functions showing ideal material behaviour. As such, it is a key tool in the understanding of a threat and its interaction with material. It also contributes to reduce the number of costly tests needed to confirm the value of materials proposed for protection or to estimate the severity of threats on the current Canadian Forces materials. To improve hydrocode simulation tools and continue to answer adequately the CF, DRDC Valcartier has developed over the last 15 years its expertise in high strain rate material testing. Test results provide materials constant needed as input to sophisticated model. As a result, simulation strongly depends on data accuracy. However, there is data discrepancy between laboratories using high strain rate systems. This has raised questions on the identification of potential sources of error in set-up and data acquisition. Several approaches were followed to verify our systems and to calibrate the instrumented bars. The accuracy and precision of the whole data acquisition chain, including the analysis software, were quantified. This document summarizes some pitfalls that influence data accuracy. It also shows how the different high strain systems improve simulation models by explaining the relationship between models such as Johnson-Cook and data produced in laboratories.

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Report Number
DRDC-VALCARTIER-TM-2007-468 — Technical Memorandum
Date of publication
01 Jul 2008
Number of Pages
38
DSTKIM No
CA031189
CANDIS No
530152
Format(s):
CD ROM

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