Three-dimensional full-field velocity measurements in shock compression experiments using stereo digital image...

Area of Science:

• Materials Science
• Mechanical Engineering
• Physics

Background:

• Conventional shock compression experiments rely on point-wise velocimetry, limiting spatial resolution.
• Laser-based interferometric techniques are standard but offer limited spatial data.
• Need for advanced techniques to capture full-field velocity data in dynamic events.

Purpose of the Study:

• To present a novel experimental methodology for measuring full-field particle velocity in shock compression.
• To utilize high-speed imaging and 3D digital image correlation (DIC) for this purpose.
• To validate the technique across various impact configurations and loading conditions.

Main Methods:

• Employed high-speed imaging coupled with 3D digital image correlation (DIC).
• Achieved a temporal resolution of 100 ns and spatial resolution of 90-200 μm/pixel.
• Conducted experiments on polycarbonate (normal impact), Y-cut quartz-tungsten carbide (isentropic compression), and pressure shear plate impact.

Main Results:

• Successfully measured macroscopic full-field normal free surface velocity in polycarbonate.
• Determined particle velocity under ramp compression waves in quartz-tungsten carbide assemblies.
• Captured both normal and transverse free surface velocities under combined loading in pressure shear experiments.

Conclusions:

• The developed 3D DIC technique provides high spatial resolution full-field free surface velocity measurements in shock compression.
• Experimental results were validated against laser interferometry data and numerical simulations.
• This methodology offers a significant advancement for studying shock-induced material responses.