Abstract
High temperature crack growth behavior is investigated over a wide range of Rratios, frequencies, and temperatures in Alloy 800H. It is found that high R-ratio, low frequency, or high temperature can enhance creep damage and thus induce an intergranular crack growth mode. At low frequencies, the nonlinear fracture mechanics parameter, C*, is found to correlate time-dependent fatigue crack growth rate well if the applied mean stress is used in calculating C*. On the other hand, the Paris crack growth law using Keff is proven to be an adequate expression to use when fatigue (time-independent) damage dominates. These conclusions correlate well with damage mechanisms observed from sample fracture surfaces.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 271-279 |
| Number of pages | 9 |
| Journal | Journal of Engineering Materials and Technology, Transactions of the ASME |
| Volume | 113 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jul 1991 |
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering