✍ Scribed by Christina Bjerkén
No coin nor oath required. For personal study only.
Stress corrosion cracking occurs due to the synergistic interaction between mechanical load and corrosion reactions. In this study, branching during anodic dissolution driven crack growth is studied using an adaptive FE procedure. The crack has an inherent blunt tip due to the dissolution, and the growth is treated as a moving boundary problem with a strain-assisted evolution law. Simulations are performed with different degrees of load biaxiality. It is found that increasing biaxiality promotes branching. No conditions for when branching takes place are found. Crack growth rates for branches are investigated, and it is found that, after an initial acceleration, constant growth rates can be reached, as well as decreasing speed and eventual arrest. The influence of T-stresses and perturbations sensitivity are discussed.
📜 SIMILAR VOLUMES
We wish to thank Professor Atkins for his interest and discussion of our paper. Several of the points made in his discussion are most interesting and lead us to add the following observations.
The relation between diffusion behavior of hydrogen atoms and crack branching in delayed failure was discussed. The hypotheses that diffusion paths of hydrogen atoms at crack tip broaden with increase of stress intensity factor K, and that crack branching occurs when hydrogen atoms diffuse through