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Design of Inserts for Split-Hopkinson Pressure Bar Testing of Low Strain-to-Failure Materials

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Abstract

In the present study a new insert design is presented and validated to enable reliable dynamic mechanical characterization of low strain-to-failure materials using the Split-Hopkinson Pressure Bar (SHPB) apparatus. Finite element-based simulations are conducted to better understand the effects of stress concentrations on the dynamic behavior of LM-1, a Zr-based bulk metallic glass (BMG), using the conventional SHPB setup with cylindrical inserts, and two modified setups—one utilizing conical inserts and the other utilizing a “dogbone” shaped specimen. Based on the results of these computational experiments the ends of the dogbone specimen are replaced with high-strength maraging steel inserts. This new insert-specimen configuration is expected to prevent specimen failure outside the specimen gage section. Simulations are then performed to validate the new insert design. Moreover, high strain-rate uniaxial compression tests are conducted on LM-1 using the modified SHPB with the new inserts. An ultra-high-speed camera is employed to investigate the changes in failure behavior of the specimens. Additional experiments are conducted with strain gages directly attached to the gage section of the specimens to determine accurately their dynamic stress–strain behavior.

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Acknowledgments

The authors acknowledge Xin Tang and Ali Shamimi Nouri for discussions and experimental support, and Liquidmetal, Inc. for producing and supplying some of the bulk metallic glass plates used in the experiments. Partial funding for this work is provided by a Case Prime Fellowship (GS, FY), ONE-N00014-03-1-0205, and DARPA-ARO-DAAD19-01-0525. Additional experimental support is provided by the U.S. Department of Energy (DOE), Corrosion and Materials Performance Cooperative, DOE Cooperative Agreement Number: DE-FC-28-04RW12252. This work is in support of the Defense Advanced Research Projects Agency, Defense Science Office, and the DOE Science & Technology Program of the Office of the Chief Scientist, Office of Civilian Radioactive Waste Management program for development of corrosion resistance of iron-based amorphous metal coatings under direction of Dr. J.C. Farmer at Lawrence Livermore National Laboratory. Funding for the high-speed camera was provided by NSF MRI, CMS 0079458.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA

    G. Sunny, F. Yuan & V. Prakash (SEM member)

  2. Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA

    J. Lewandowski

Authors
  1. G. Sunny
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  2. F. Yuan
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  3. V. Prakash
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  4. J. Lewandowski
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Correspondence to V. Prakash.

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Sunny, G., Yuan, F., Prakash, V. et al. Design of Inserts for Split-Hopkinson Pressure Bar Testing of Low Strain-to-Failure Materials. Exp Mech 49, 479–490 (2009). https://doi.org/10.1007/s11340-008-9145-1

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  • DOI: https://doi.org/10.1007/s11340-008-9145-1

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