Abstract
It is well known that the level of constraint of material at a crack-tip during loading can affect the apparent fracture toughness of components and structures. The effects of geometry and loading on the development of constraint are well defined. Recent research has shown that residual stresses, defined as stresses existing in a material when it is under no primary load, present in the crack-tip region can also affect constraint. However, the effects of this on fracture toughness are not, currently, well understood. The aim of this paper is to investigate the use of constraint based fracture mechanics to quantify unique material fracture toughness curves in two-parameter fracture mechanics type analyses. A novel method for generating residual stresses in single edge notch bend specimens, with minimal associated crack-tip plastic strain, has been devised analytically. Experimental validation has been undertaken to investigate the applicability of constraint based fracture mechanics to characterise the effect of residual stress on brittle fracture of a pressure vessel steel. The results suggest that the use of a unique material toughness curve is possible, certainly when there is a negligible effect of prior plastic strain in the crack-tip region.
| Original language | English |
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| Title of host publication | ASME 2011 Pressure Vessels and Piping Conference, PVP 2011 |
| Pages | 247-257 |
| Number of pages | 11 |
| Volume | 5 |
| DOIs | |
| Publication status | Published - 2011 |
| Event | ASME 2011 Pressure Vessels and Piping Conference, PVP 2011 - Baltimore, United States Duration: 17 Jul 2011 → 21 Jul 2011 |
Conference
| Conference | ASME 2011 Pressure Vessels and Piping Conference, PVP 2011 |
|---|---|
| Country/Territory | United States |
| City | Baltimore |
| Period | 17/07/11 → 21/07/11 |
Research Beacons, Institutes and Platforms
- Dalton Nuclear Institute