Measuring J-R curve under dynamic loading conditions using digital image correlation

This article describes a convenient method to quantify the dynamic J-R curve through digital image correlation (DIC). The DIC approach, verified through numerical and experimental results for single edge notched bend (SE(B)) specimens, quantifies the dynamic J-R curve during the drop-weight tearing test (DWTT). The proposed method enables consistent measurement of the J-integral and the amount of crack extension solely from the DIC measured displacement on the specimen surface, which facilitates direct comparison of fracture toughness under different strain rates. The results demonstrate enhanced Mode-I fracture resistance of metallic materials under increased strain rates.