Thursday  |  Monongahela  |  02:10 PM–02:30 PM

#13382, Effect of Microstructure Variation on Shock Induced Temperature Rise and Phase Change using Laser Array Raman Spectroscopy

The quantification of phase change of material during the shock compression is important to model the temperature rise and reaction mechanism of energetic material. However, experimental quantification of thermo-mechanical field and chemical analysis during shock compression of a heterogeneous domain of material is limited by the current diagnostic methods. Time-gated Raman spectroscopy has been used in the past for chemical analysis at a nanosecond time scale. However, such analysis is only limited to a small domain or single measurement point on the microstructure. In this work, we present a unique setup where Raman spectra were collected over multi-locations on microstructure using a laser array method. The excited Raman signal from each spot on the array was collected simultaneously on the spectrometer using a custom design of optical path. This technique was used to quantify the effect of friction and shock confinement in the interface between two energetic crystals. Shock-induced temperature distribution and phase-field were measured as a function of proximity between the energetic particles. The results show the correlation between temperature rise and melting of energetic material as a function of microstructure variation.

Abhijeet Dhiman   Purdue University
Tyler Dillard   Purdue University
Vikas Tomar   Purdue University