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Strain gradient plasticity modeling of hydrogen diffusion to the crack tip

Emilio Martínez Pañeda's picture

Strain gradient plasticity modeling of hydrogen diffusion to the crack tip

E. Martínez-Pañeda, S. del Busto, C.F. Niordson, C. Betegón

International Journal of Hydrogen Energy

http://www.sciencedirect.com/science/article/pii/S0360319915315913

In this work hydrogen diffusion towards the fracture process zone is examined accounting for local hardening due to geometrically necessary dislocations (GNDs) by means of strain gradient plasticity (SGP). Finite element computations are performed within the finite deformation theory to characterize the gradient-enhanced stress elevation and subsequent diffusion of hydrogen towards the crack tip. Results reveal that GNDs, absent in conventional plasticity predictions, play a fundamental role on hydrogen transport ahead of a crack. SGP estimations provide a good agreement with experimental measurements of crack tip deformation and high levels of lattice hydrogen concentration are predicted within microns to the crack tip. The important implications of the results in the understanding of hydrogen embrittlement mechanisms are thoroughly discussed.

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It is a very nice paper. GNDs are important in explaining hydrogen emebrittlement mechanisms. Such strain gradient models can be further developed to include fracture mechanics based on total hydrogen concentration.

I have been working on the same problem but I have a long way to go.

Emilio Martínez Pañeda's picture

Thank you for your nice comment. I look forward to reading your work on the topic.

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