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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

Vol. 17 (2022), No. 4, 381–401
Abstract

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.

Keywords
split Hopkinson pressure bar, blast-induced traumatic brain injury, actuator design, optimization, impact, wave dynamics
Milestones
Received: 16 May 2022
Revised: 5 July 2022
Accepted: 15 July 2022
Published: 18 February 2023
Authors
Suhas Vidhate
Department of Mechanical Engineering
Michigan State University
East Lansing, MI
United States
Atacan Yucesoy
Department of Mechanical Engineering
Michigan State University
East Lansing, MI
United States
Thomas J. Pence
Department of Mechanical Engineering
Michigan State University
East Lansing, MI
United States
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