Modeling Dynamic Behavior Of Materials Using Modified RMI Test

The drag effect on material strength, governed by viscous and phonon drag mechanisms, is critical for determining the mechanical properties of materials at the microscopic level. One method to study these effects involves conducting Richtmyer–Meshkov Instability (RMI) tests on solids, where shock waves traverse material interfaces, inducing instabilities. Such instabilities provide key insights into the dynamic response of materials under high strain rates. Small line perturbations on the order of micrometers were machined onto the specimen surface to prepare the RMI test. In the present work, a larger axisymmetric perturbation was fabricated to simplify the specimen preparation and generate well-defined spikes, allowing the direct velocity measurements of an individual spike to produce a material jet comparable in size to those achievable in DTE experiments. After testing, the fragments were recovered for microstructural analysis. The resulting data were compared to numerical findings, ensuring accuracy and consistency in characterizing material behavior under rapid deformation.