Evaluation of Mode II Delamination Area by Non-destructive Techniques: Accuracy and Influence on Fracture Toughness Calculation

Estimating crack tip position in adhesively bonded joints subjected to mode II quasi‐static loading

“…To address this challenge, structural health monitoring (SHM) and nondestructive testing (NDT) are often employed. 9 Techniques such as visual testing (VT), 10,11 penetrant testing, 12,13 ultrasonic guided waves, 14 acoustic emission, 15 X-ray computed tomography, 9,16 and ultrasonic microscopy 9 have been used for the inspection and characterization of cracks in adhesive joints under mode II loading. Among these techniques, VT is one of the most common, rapid, and intuitive techniques for monitoring crack propagation, and it is the only standardized technique.…”

“…Among these techniques, VT is one of the most common, rapid, and intuitive techniques for monitoring crack propagation, and it is the only standardized technique. 9 It has proven to be effective in mode I loading. 3,17,18 In mode II loading, however, the crack does not often propagate straight and smooth as in mode I loading.…”

“…3,17,18 In mode II loading, however, the crack does not often propagate straight and smooth as in mode I loading. 9,11 On top of that, the absence of crack opening makes it challenging to detect the crack tip accurately. These factors can affect the accuracy of measurements and introduce uncertainties.…”

“…One of the major challenges associated with adhesive bonded joints is to guarantee the in‐service structural integrity of the joints over time. To address this challenge, structural health monitoring (SHM) and non‐destructive testing (NDT) are often employed 9 . Techniques such as visual testing (VT), 10,11 penetrant testing, 12,13 ultrasonic guided waves, 14 acoustic emission, 15 X‐ray computed tomography, 9,16 and ultrasonic microscopy 9 have been used for the inspection and characterization of cracks in adhesive joints under mode II loading.…”

“…It has proven to be effective in mode I loading 3,17,18 . In mode II loading, however, the crack does not often propagate straight and smooth as in mode I loading 9,11 . On top of that, the absence of crack opening makes it challenging to detect the crack tip accurately.…”