Dynamic Tensile Characterization of Thin-Sheet Brittle Metallic Materials

Sanborn, B.; Hudspeth, M.; Song, B.

doi:10.1007/s40799-020-00384-7

Dynamic Tensile Characterization of Thin-Sheet Brittle Metallic Materials

Journal Article · Wed Jul 22 00:00:00 EDT 2020 · Experimental Techniques

DOI:https://doi.org/10.1007/s40799-020-00384-7· OSTI ID:1697984

Sanborn, B. ^[1]; Hudspeth, M. ^[2]; Song, B. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Refractory metals are favorable materials in applications where high strength and ductility are needed at elevated temperatures. In some cases, operating temperatures may be near the melting point of the material. However, as temperature drops, refractory metals typically undergo a significant mechanical response change - ductile-to-brittle transition. These materials may be subjected to high strain rate loading at an ambient temperature state, such as an impact or crash. Knowledge of the high rate material properties are essential for design as well as simulation of impact events. The high rate stress-strain behavior of brittle metallic materials at ambient temperature is rarely studied because of experimental challenges, particularly when failure is involved. Failure typically occurs within the non-gage section of the material, which invalidates any collected stress-strain information. Here, a method to determine a specimen geometry which will produce failures in the gage section is presented. Pure tungsten in thin-sheet form was used as a trial material to select a specimen geometry for high rate Kolsky tension bar experiments. A finite element simulation was conducted to derive a strain correction for more accurate results. The room temperature stress-strain behavior of pure tungsten at a strain rate of 24 s^–1 is presented. The outcome of this experimental technique can be applied to other brittle materials for dynamic tensile characterization.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525; 89233218CNA000001

OSTI ID:: 1697984

Report Number(s):: SAND--2019-4063J; 674597

Journal Information:: Experimental Techniques, Journal Name: Experimental Techniques Journal Issue: 5 Vol. 44; ISSN 0732-8818

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
brittle materials
high rate
refractory metals
stress-strain
tensile behavior
tungsten

Dynamic Tensile Characterization of Thin-Sheet Brittle Metallic Materials

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