Evaluation of multiple stress corrosion crack interactions by in-situ Digital Image Correlation

Abstract

Digital Image Correlation (DIC), Acoustic Emission and Electrochemical Noise measurements were applied to study the growth of multiple intergranular cracks as a colony on an Alloy 600 in a tetrathionate solution. Cracks exceeding 55 μm in length and 0.45 μm in opening were successfully detected by DIC. Moreover, crack popu-lation was classified into initiating, active and dormant cracks, active population being the larger one. The emergence and intensification of interactions produced a modification on the colony growth behavior. They range from a mostly surface crack propagation (in the absence of interactions), to in depth propagation pre-dominantly governed by crack shielding.

A phase field method for modeling stress corrosion crack propagation in a nickel base alloy

“…We also identify several fracture parameters such as: crack length, crack growth rate, crack initiation...(see Bolivar et al (2016) for more details)…”

“…Finally, the samples exhibit many random heterogeneities that give local contrast of grey levels in the images, what is promising for DIC. The details of experimental setup has been described in Bolivar et al (2016) Constant load tests were performed for this study. First, the samples are immersed in the test solution (10 mM K 2 S 4 O 6 , pH = 3) for about 45 minutes.…”

“…1(a). (see Bolivar et al (2016) To use DIC, a specific procedure has been proposed to improve the grey level contrast on the sample surface. Finally, the samples exhibit many random heterogeneities that give local contrast of grey levels in the images, what is promising for DIC.…”

Fatigue Growth Behaviour of Two Interacting Cracks with Different Crack Offset

“…Multiple cracks may be initiated and propagated owing to fatigue and corrosion in structural components, especially at multiple riveted locations [1,2,3]. During the growth process of a crack, the interaction of multiple cracks might occur when a specific condition is reached, which could have a large impact on crack growth behaviour [4,5].…”

Effect of pre‐corrosion on damage evolution and crack propagation in aluminum alloy 7050‐T7651

“…This optical technique has been extensively applied to various materials, such as metals, composites, and rock . DIC was utilized to study the growth of multiple intergranular cracks as a colony on an Alloy 600 in a tetrathionate solution . Short cracks during intergranular stress‐corrosion cracking of austenitic stainless steel were detected by DIC .…”