Crack Tip Plasticity Associated with Corrosion Assisted Fatigue.
Abstract
The effects of a water vapor environment on crack tip plasticity in low-carbon steel have been further examined. Strains in the plastic zone, as determined by stereoimaging, have been used to compute stresses at the same locations, and an estimate of the energy expended for creation of new crack area may also be computed using the same strains. These values are compared with similar information derived previously using plastic zone subgrain size distributions as determined by electron channeling. There is general agreement between the data determined by the two techniques. A model is offered for including the effects of water vapor upon crack tip plasticity into the damage accumulation analysis of fatigue crack propagation. A critical discussion is also given of the findings to date on the effects of environment on crack tip plasticity, and it is concluded that those findings may be explained by changes in the material properties very close to the crack tip, rather than in the bulk of the plastic zone. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 1980
- Accession Number
- ADA087961
Entities
People
- D. L. Davidson
- J. Lankford
Organizations
- Southwest Research Institute