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Design strategies
for a multimaterial Hopkinson bar that provides a specific
spectral character loading
Suhas Vidhate, Atacan Yucesoy, Thomas J. Pence, Adam M. Willis and Ricardo Mejia-Alvarez |
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Vol. 17 (2022), No. 4, 381–401
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Abstract |
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Complicated stress wave patterns occur as a matter of course when systems composed of multiple materials and interfaces are subjected to impact or blast-like impulsive loads. Conventional testing systems, e.g., blast-tubes, shock-tubes, split Hopkinson pressure bars (SHPB), etc., are limited in their ability to replicate such stress wave profiles, which motivates an experimental technique that can generate repeatable cycles of user-specified multifrequency stress waves. To this end, we consider the concept of a multimaterial Hopkinson bar (MMHB) actuator by replacing the incident bar of a conventional SHPB with multiple bars of different materials arranged in series. The multimaterial incident bar leverages the impedance mismatch at material interfaces to transform the incident stress pulse into a complex loading profile. The design parameters for an MMHB actuator, such as the materials and lengths of bar components, are adjusted so as to closely replicate the user-defined target loading profile. This is achieved by coupling the numerical simulation of the MMHB actuator with an optimization algorithm. |
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Keywords
split Hopkinson pressure bar, blast-induced traumatic brain
injury, actuator design, optimization, impact, wave
dynamics
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Milestones
Received: 16 May 2022
Revised: 5 July 2022
Accepted: 15 July 2022
Published: 18 February 2023
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Authors |
| Suhas Vidhate | |
| Department of Mechanical
Engineering Michigan State University East Lansing, MI United States |
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| Atacan Yucesoy | |
| Department of Mechanical
Engineering Michigan State University East Lansing, MI United States |
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| Thomas J. Pence | |
| Department of Mechanical
Engineering Michigan State University East Lansing, MI United States |
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| Adam M. Willis | |
| Department of Mechanical
Engineering Michigan State University East Lansing, MI United States |
59th Medical Wing Office of the Chief Scientist Lackland AFB, TX United States |
| Ricardo Mejia-Alvarez | |
| Department of Mechanical
Engineering Michigan State University East Lansing, MI United States |
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