Multi-scale crack closure measurements with digital image correlation on Haynes 230
An experimental campaign was developed to study fatigue crack growth in Haynes 230, a Ni-based superalloy. The effects of crack closure were investigated with digital image correlation, by applying two different approaches. Initially, full field regression algorithms were applied to extract the ef...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2015-07-01
|
| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_22.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | An experimental campaign was developed to study fatigue crack growth in Haynes 230, a Ni-based
superalloy. The effects of crack closure were investigated with digital image correlation, by applying two different
approaches. Initially, full field regression algorithms were applied to extract the effective stress intensity factor ranges from
the singular displacement field measured at crack tips. Local closure measurements were then performed by considering
crack flanks relative displacements. Two points virtual extensometers were applied in this phase. Experimental results
were then compared to the reference da/dN –ΔKeff curve: it was found that the correct estimation of crack opening levels
shifts all the experimental points on the reference curve, showing that DIC can be successfully applied to measure crack
closure effects. |
|---|---|
| ISSN: | 1971-8993 1971-8993 |