A non-contact approach to measure J-R curve for side-grooved specimens using digital image correlation

This manuscript presents a non-contact approach to measure the J-integral resistance (J-R) curve for sidegrooved specimens using data measured solely from the digital image correlation (DIC). The DIC-based J measurement deploys specified contours and domains on the specimen free surface while the amount of crack extension derives from the rotation factor. The numerical analyses verify the DIC algorithm and investigate the side-grooving effects. This study establishes a fundamental relationship between the free-surface and throughthickness averaged J values, which is evidenced through theoretical and experimental validations. The modified free-surface J-integral achieves good agreement with the through-thickness averaged J results under smallscale yielding conditions. This study demonstrates that side grooves impose trivial effects on the accuracy of the DIC J-R curve measurement.

Automated summary

This manuscript presents a non-contact approach to measure the J-integral resistance (J-R) curve for sidegrooved specimens using data measured solely from the digital image correlation (DIC). It establishes a fundamental relationship between the free-surface and throughthickness averaged J values, and demonstrates that side grooves impose trivial effects on the accuracy of the DIC J-R curve measurement.