Monday  |  Lakeshore A  |  02:00 PM–02:20 PM

#19288, Energy Dissipation and Shock-Induced Phase Changes in Mock Energetic Crystals via In-Situ Raman Imaging

This study investigates shock deformation and energy dissipation in mock-energetic crystals using advanced full-field time-gated Raman spectroscopy. The experimental approach involved multiple timestamps to assess shock dissipation along the [1 0 0] direction, aligning with the direction of shock propagation. A total of 300 experiments were conducted to integrate and construct Raman spectra within short time windows of less than 10 ns, allowing for detailed observation of shock-induced changes.
Flyer velocities of 0.6 km/s and 1.2 km/s were utilized to generate high-pressure conditions of up to 3 GPa and temperatures exceeding 1000 °C within the sample. The motion of the aluminum flyer was monitored, and its planarity was confirmed using high-speed optical imaging, which demonstrated the necessity of maintaining a uniform impact to prevent non-uniform deformation during shock propagation. Raman imaging results were validated through optical imaging captured at a billion frames per second, ensuring precise synchronization between the observed phenomena and their underlying physical processes.
This comprehensive analysis provides insights into the elastic-plastic transitions and phase changes occurring in solid materials subjected to shock loading conditions. The findings illustrate the capabilities of time-resolved Raman spectroscopy in studying the intricate responses of materials under extreme conditions, contributing to the understanding of shock wave dynamics in mock-energetic crystals.

Mahavir Singh   Purdue University
Seongmin Yoon   Purdue University
Vikas Tomar   Purdue University