Abstract
Fatigue crack growth was investigated in Haynes 230, a nickel-based superalloy. Anisotropic stress intensity factors were calculated with a least squares algorithm using the displacements obtained from digital image correlation. Crack opening/sliding levels were measured by analysing the relative displacement of crack flanks. Reversed crack tip plastic zones were calculated adopting an anisotropic yield criterion. The strains measured in the reversed plastic zone by digital image correlation showed a dependence on crystallographic orientation. Finally, a finite element model was adopted to examine plasticity around the crack tip. Results were compared with the experimentally observed strains.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 583-596 |
| Number of pages | 14 |
| Journal | Fatigue and Fracture of Engineering Materials and Structures |
| Volume | 38 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 1 2015 |
Keywords
- effective stress intensity factor range
- fatigue crack growth
- mixed-mode propagation
- plastic zone
- single crystal nickel-based alloy
- single crystal plasticity
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering