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Blast Quantification Using Hopkinson Pressure Bars
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Published on: July 5, 2016

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Blast Quantification Using Hopkinson Pressure Bars.

Samuel D Clarke1, Stephen D Fay2, Samuel E Rigby3

  • 1Department of Civil & Structural Engineering, University of Sheffield; sam.clarke@sheffield.ac.uk.

Journal of Visualized Experiments : Jove
|July 13, 2016
PubMed
Summary
This summary is machine-generated.

The Hopkinson pressure bar effectively measures extreme blast pressures in harsh environments. Its design protects sensors, enabling accurate blast load data acquisition and analysis.

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Shock Physics

Background:

  • Measuring near-field blast loads is challenging due to extreme pressures (hundreds of megapascals) and aggressive environments.
  • Standard sensors often fail or are compromised in such conditions.
  • The Hopkinson pressure bar offers a robust solution for high-pressure, hostile environments.

Purpose of the Study:

  • To present a method for accurate near-field blast load measurement using an array of Hopkinson pressure bars.
  • To describe techniques for protecting sensors while maintaining measurement integrity.
  • To detail an interpolation method for deriving pressure-time histories at un-instrumented locations.

Main Methods:

  • Utilizing an array of Hopkinson pressure bars to capture pressure-time histories at discrete points.
  • Employing protective housings for strain gauges, positioned away from the direct blast impact.
  • Developing and applying an interpolation routine to reconstruct pressure fields.

Main Results:

  • Demonstrated the capability of the Hopkinson pressure bar system to withstand and measure extreme blast pressures.
  • Successfully acquired pressure-time data in free-air and shallowly buried high-explosive tests.
  • Validated the interpolation technique for deriving pressure distributions.

Conclusions:

  • The Hopkinson pressure bar is a suitable and advantageous tool for near-field blast load measurement in severe conditions.
  • The described methodology allows for detailed characterization of blast loading.
  • This technique is applicable to various scenarios, including high explosives in air and soil.