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Title: Dynamic High-temperature Testing of an Iridium Alloy in Compression at High-strain Rates: Dynamic High-temperature Testing

Iridium alloys have superior strength and ductility at elevated temperatures, making them useful as structural materials for certain high-temperature applications. However, experimental data on their high-strain -rate performance are needed for understanding high-speed impacts in severe environments. Kolsky bars (also called split Hopkinson bars) have been extensively employed for high-strain -rate characterization of materials at room temperature, but it has been challenging to adapt them for the measurement of dynamic properties at high temperatures. In our study, we analyzed the difficulties encountered in high-temperature Kolsky bar testing of thin iridium alloy specimens in compression. We made appropriate modifications using the current high-temperature Kolsky bar technique in order to obtain reliable compressive stress–strain response of an iridium alloy at high-strain rates (300–10 000 s-1) and temperatures (750 and 1030°C). The compressive stress–strain response of the iridium alloy showed significant sensitivity to both strain rate and temperature.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [3]
  1. Sandia National Laboratories, Albuquerque NM 87185 USA
  2. Sandia National Laboratories, Livermore CA 94550 USA
  3. Oak Ridge National Laboratory, Oak Ridge TN 37831 USA
Publication Date:
OSTI Identifier:
1122972
Report Number(s):
SAND--2013-10540J
Journal ID: ISSN 0039-2103; 491973
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Strain
Additional Journal Information:
Journal Volume: 50; Journal Issue: 6; Journal ID: ISSN 0039-2103
Publisher:
Wiley
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE NESDPS Office of Nuclear Energy Space and Defense Power Systems