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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