Three-dimensional full-field velocity measurements in shock compression experiments using stereo digital image correlation
Abstract
Shock compression plate impact experiments conventionally rely on point-wise velocimetry measurements based on laser-based interferometric techniques. This study presents an experimental methodology to measure the free surface full-field particle velocity in shock compression experiments using high-speed imaging and three-dimensional (3D) digital image correlation (DIC). The experimental setup has a temporal resolution of 100 ns with a spatial resolution varying from 90 to 200 μm/pixel. Experiments were conducted under three different plate impact configurations to measure spatially resolved free surface velocity and validate the experimental technique. First, a normal impact experiment was conducted on polycarbonate to measure the macroscopic full-field normal free surface velocity. Second, an isentropic compression experiment on Y-cut quartz–tungsten carbide assembly is performed to measure the particle velocity for experiments involving ramp compression waves. To explore the capability of the technique in multiaxial loading conditions, a pressure shear plate impact experiment was conducted to measure both the normal and transverse free surface velocities under combined normal and shear loading. The velocities measured in the experiments using digital image correlation are validated against previous data obtained from laser interferometry. Numerical simulations were also performed using established material models to compare and validate the experimental velocity profiles for these different impact configurations. The novel ability of the employed experimental setup to measure full-field free surface velocities with high spatial resolutions in shock compression experiments is demonstrated for the first time in this work.
Additional Information
© 2023 Author(s). Published under an exclusive license by AIP Publishing. This research was supported by the DOE/NNSA (Award No. DE-NA0003957), which is gratefully acknowledged. The authors acknowledge the support provided by the Office of Naval Research (Award No. N00014-16-1-2839) for developing the high-pressure PSPI capability and the Army Research Laboratory (Cooperative Agreement No. W911NF-12-2-0022) for the acquisition of high-speed cameras. Author Contributions. Suraj Ravindran and Vatsa Gandhi contributed equally to this work. Suraj Ravindran: Conceptualization (equal); Data curation (equal); Formal analysis (equal); Investigation (equal); Methodology (equal); Supervision (equal); Validation (equal); Visualization (equal); Writing – original draft (equal); Writing – review & editing (equal). Vatsa Gandhi: Conceptualization (equal); Data curation (equal); Formal analysis (equal); Investigation (equal); Methodology (equal); Validation (equal); Visualization (equal); Writing – original draft (equal); Writing – review & editing (equal). Akshay Joshi: Data curation (supporting); Formal analysis (supporting). Guruswami Ravichandran: Funding acquisition (lead); Supervision (equal); Writing – original draft (equal); Writing – review & editing (equal). DATA AVAILABILITY. The data that support the findings of this study are available from the corresponding author upon reasonable request. The authors have no conflicts to disclose.Additional details
- Eprint ID
- 120070
- DOI
- 10.1063/5.0131590
- Resolver ID
- CaltechAUTHORS:20230315-645491100.2
- DE-NA0003957
- Department of Energy (DOE) National Nuclear Security Administration
- N00014-16-1-2839
- Office of Naval Research (ONR)
- W911NF-12-2-0022
- Army Research Laboratory
- Created
-
2023-05-17Created from EPrint's datestamp field
- Updated
-
2023-05-17Created from EPrint's last_modified field
- Caltech groups
- GALCIT