A phase field formulation for hydrogen assisted cracking
View / Open Files
Publication Date
2018-12-01Journal Title
Computer Methods in Applied Mechanics and Engineering
ISSN
0045-7825
Publisher
Elsevier BV
Volume
342
Pages
742-761
Type
Article
Metadata
Show full item recordCitation
Martínez-Pañeda, E., Golahmar, A., & Niordson, C. (2018). A phase field formulation for hydrogen assisted cracking. Computer Methods in Applied Mechanics and Engineering, 342 742-761. https://doi.org/10.1016/j.cma.2018.07.021
Abstract
We present a phase field modeling framework for hydrogen assisted cracking.
The model builds upon a coupled mechanical and hydrogen diffusion response,
driven by chemical potential gradients, and a hydrogen-dependent fracture
energy degradation law grounded on first principles calculations. The coupled
problem is solved in an implicit time integration scheme, where displacements,
phase field order parameter and hydrogen concentration are the primary
variables. We show that phase field formulations for fracture are particularly
suitable to capture material degradation due to hydrogen. Specifically, we
model (i) unstable crack growth in the presence of hydrogen, (ii) failure
stress sensitivity to hydrogen content in notched specimens, (iii) cracking
thresholds under constant load, (iv) internal hydrogen assisted fracture in
cracked specimens, and (v) complex crack paths arising from corrosion pits.
Computations reveal a good agreement with experiments, highlighting the
predictive capabilities of the present scheme. The work could have important
implications for the prediction and prevention of catastrophic failures in
corrosive environments. The finite element code developed can be downloaded
from www.empaneda.com/codes
Identifiers
External DOI: https://doi.org/10.1016/j.cma.2018.07.021
This record's URL: https://www.repository.cam.ac.uk/handle/1810/285019
Rights
Licence:
http://www.rioxx.net/licenses/all-rights-reserved
Statistics
Total file downloads (since January 2020). For more information on metrics see the
IRUS guide.