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<p>A method<!--Query ID="Q1" Text="Please check and confirm if the authors and their respective affiliations have been correctly identified. Amend if necessary." Resolved="yes"--> for supporting miniature pressure bars is investigated. A stack of three precision rods serves as the bushings for a smaller diameter pressure bar which passes through the enclosed region and is supported by the three line-contacts with the bushing<!--Query ID="Q2" Text="Please check and confirm if the article note is correctly identified." Resolved="yes"--> rods. The method was developed for bars with very small diameters, where traditional bushings are difficult to machine with precision. However, it can be used with conventional bars, and an application is given with a 7.849&#xa0;mm diameter aluminum diameter Kolsky bar. Here it is shown that by using an appropriate fit, bending waves can be mitigated while maintaining negligible friction. This is an important feature for small diameter bars where precise alignment is difficult to maintain, and bending waves can be excessive. It is also shown that using this method, a 101.6&#xa0;μm diameter steel bar can propagate frequencies as high as 21&#xa0;MHz (~ 50 ns rise-time). This bar is used in a modified Kolsky bar arrangement for mechanical testing of a nanocrystalline Cu-10Ta alloy at rates over 2&#xa0;M/s.</p>

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A Kolsky Bar Method for Strain-Rates Greater Than 1,000,000/s

  • 期刊论文

  • 发表日期：

    2025年4月17日

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  • D. Casem,
  • J. Ligda,
  • B. C. Hornbuckle,
  • K. Darling

摘要

A method for supporting miniature pressure bars is investigated. A stack of three precision rods serves as the bushings for a smaller diameter pressure bar which passes through the enclosed region and is supported by the three line-contacts with the bushing rods. The method was developed for bars with very small diameters, where traditional bushings are difficult to machine with precision. However, it can be used with conventional bars, and an application is given with a 7.849 mm diameter aluminum diameter Kolsky bar. Here it is shown that by using an appropriate fit, bending waves can be mitigated while maintaining negligible friction. This is an important feature for small diameter bars where precise alignment is difficult to maintain, and bending waves can be excessive. It is also shown that using this method, a 101.6 μm diameter steel bar can propagate frequencies as high as 21 MHz (~ 50 ns rise-time). This bar is used in a modified Kolsky bar arrangement for mechanical testing of a nanocrystalline Cu-10Ta alloy at rates over 2 M/s.