Abstract
Negative creep describes the time dependent contraction of a material as opposed to the elongation seen for a material experiencing normal creep behavior. Negative creep occurs because of solid state transformations that results in lattice contractions.
For most applications negative creep will have no practical implications but under certain conditions it may become critical. For bolts and fasteners, which are highly constrained during service, negative creep may lead to dramatically increased stresses and eventually to failure.
The article was inspired by a recent failure of Nimonic 80A bolts in German gas turbines. As a result of this failure similar bolts from Danish gas turbines of the same type were investigated and it was found that the bolts had experienced negative creep during service.
| Original language | English |
|---|---|
| Title of host publication | Baltica VI : Life Management and Maintenance for Power Plants |
| Editors | Juha Veivo, Pertti Auerkari |
| Volume | 1 |
| Place of Publication | Finland |
| Publisher | VTT |
| Publication date | 2004 |
| Pages | 329-343 |
| ISBN (Print) | 951-38-6291-7 |
| Publication status | Published - 2004 |
| Event | BALTICA VI : Life Management and Maintenance for Power Plants - Helsinki, Finland Duration: 8 Jun 2004 → 10 Jun 2004 Conference number: 6 |
Conference
| Conference | BALTICA VI : Life Management and Maintenance for Power Plants |
|---|---|
| Number | 6 |
| Country/Territory | Finland |
| City | Helsinki |
| Period | 08/06/2004 → 10/06/2004 |