About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Dynamic Behavior of Materials IX
|
Presentation Title |
In-situ Shock Stress Field Detection Using Laser Array Raman Spectroscopy |
Author(s) |
Abhijeet Dhiman, Nolan Lewis, Vikas Tomar |
On-Site Speaker (Planned) |
Abhijeet Dhiman |
Abstract Scope |
Time-gated Raman spectroscopy has been used in the past for chemical analysis at a nanosecond time scale. Based on prior calibration, the Raman spectra can be used to predict local stress on a microscale spot size. In this work, we used a unique setup where multi-spot Raman spectra were obtained over a microstructure using laser array spots on the sample. The excited Raman signal from each spot on the array was collected into a two-dimensional array of optical fibers for simultaneous spectrum analysis by a spectrograph. This technique was used to measure shock wave propagation through a microstructure of polymer bonded sugar at strain rates higher than 10^6/s. The study shows the effects of partial melting of sugar crystals due to shock compression and interparticle interactions. |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Other, Composites |