Material Response Measured Using Digital Image Correlation for Dynamic Modified Brazil Disk Impact Testing

This study investigates the interplay between geometry and constitutive response in materials by the method of dynamic impact testing on modified Brazil disks. Utilizing digital image correlation (DIC), we measured the full 3D strain field of a modified Brazil disk subjected to impact from a light-gas gun. This experimental setup offers a quasi-2D interaction that effectively interrogates both tensile and shear strength effects. Various lighting techniques and surface preparation methods were explored to optimize the DIC measurements. An ideal combination of parameters was identified, enabling ultra-high-speed 3D DIC measurements at high strain rates during the impact testing. Our findings demonstrate that the modified Brazil disk light-gas gun impact experiment serves as a novel approach to simultaneously probe tensile and shear effects at high strain rates.

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