Historically, there have been a half-dozen hydrogen induced degradation models proposed. A few of these have since been rejected but the remaining ones can be categorized into two. For the first general category, hydrogen enhanced decohesion (HEDE) has been promoted as hydrogen lowering the forces required for atom separation reducing the brittle fracture stress. As to the second general category, this has been identified with hydrogen enhanced localized plasticity (HELP). Here, hydrogen lowers the forces required to localize dislocation plasticity thereby reducing shear stresses for ductile fracture. The following review points out general features of each with the historical development of both experimental and theoretical milestones in each decade from the 1950s or 1960s to the present day.
|Original language||English (US)|
|Title of host publication||Gaseous Hydrogen Embrittlement of Materials in Energy Technologies|
|Subtitle of host publication||Mechanisms, Modelling and Future Developments|
|Number of pages||38|
|State||Published - Jan 2012|
Bibliographical noteFunding Information:
This work was supported by the NSF/DMR 0946337, the Air Force Office of Scientific Research A0ARD-08-4134, and the Abu Dhabi-Minnesota Institute for Research Excellence, a partnership with the Petroleum Institiute.
- Decohesion modeling
- Enhanced plasticity
- Enhanced plasticity modeling
- Hydrogen enhanced decohesion (HEDE)
- Hydrogen enhanced localized plasticity (HELP)
- Mechanism milestones