Details
| Original language | English |
|---|---|
| Pages (from-to) | 809-826 |
| Number of pages | 18 |
| Journal | Fatigue and Fracture of Engineering Materials and Structures |
| Volume | 36 |
| Issue number | 8 |
| Publication status | Published - 8 Apr 2013 |
Abstract
In polycrystalline metals, microstructural features such as grain boundaries (GBs) influence fatigue crack initiation. Stress and strain heterogeneities, which arise in the vicinity of GBs, can promote the nucleation of fatigue cracks. Because of variations in grain size and GB types, and consequently variations in the local deformation response, scatter in fatigue life is expected. A deeper quantitative understanding of the early stages of fatigue crack nucleation and the scatter in life requires experimental and modelling work at appropriate length scales. In this work, experiments are conducted on Hastelloy X under fatigue conditions, and observations of fatigue damage are reported in conjunction with measurements of local strains using digital image correlation. We use a recent novel fatigue model based on persistent slip band-GB interaction to investigate the scatter in fatigue lives and shed light into the critical types of GBs that nucleate cracks. Experimental tools and methodologies, utilizing ex situ digital image correlation and electron backscatter diffraction, for high resolution deformation measurements at the grain level are also discussed in this paper and related to the simulations.
Keywords
- fatigue crack initiation, grain boundaries, grain cluster, microstructure, persistent slip band
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Fatigue and Fracture of Engineering Materials and Structures, Vol. 36, No. 8, 08.04.2013, p. 809-826.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Fatigue crack initiation in Hastelloy X
T2 - the role of boundaries
AU - Abuzaid, W.
AU - Oral, A.
AU - Sehitoglu, H.
AU - Lambros, J.
AU - Maier, H. J.
PY - 2013/4/8
Y1 - 2013/4/8
N2 - In polycrystalline metals, microstructural features such as grain boundaries (GBs) influence fatigue crack initiation. Stress and strain heterogeneities, which arise in the vicinity of GBs, can promote the nucleation of fatigue cracks. Because of variations in grain size and GB types, and consequently variations in the local deformation response, scatter in fatigue life is expected. A deeper quantitative understanding of the early stages of fatigue crack nucleation and the scatter in life requires experimental and modelling work at appropriate length scales. In this work, experiments are conducted on Hastelloy X under fatigue conditions, and observations of fatigue damage are reported in conjunction with measurements of local strains using digital image correlation. We use a recent novel fatigue model based on persistent slip band-GB interaction to investigate the scatter in fatigue lives and shed light into the critical types of GBs that nucleate cracks. Experimental tools and methodologies, utilizing ex situ digital image correlation and electron backscatter diffraction, for high resolution deformation measurements at the grain level are also discussed in this paper and related to the simulations.
AB - In polycrystalline metals, microstructural features such as grain boundaries (GBs) influence fatigue crack initiation. Stress and strain heterogeneities, which arise in the vicinity of GBs, can promote the nucleation of fatigue cracks. Because of variations in grain size and GB types, and consequently variations in the local deformation response, scatter in fatigue life is expected. A deeper quantitative understanding of the early stages of fatigue crack nucleation and the scatter in life requires experimental and modelling work at appropriate length scales. In this work, experiments are conducted on Hastelloy X under fatigue conditions, and observations of fatigue damage are reported in conjunction with measurements of local strains using digital image correlation. We use a recent novel fatigue model based on persistent slip band-GB interaction to investigate the scatter in fatigue lives and shed light into the critical types of GBs that nucleate cracks. Experimental tools and methodologies, utilizing ex situ digital image correlation and electron backscatter diffraction, for high resolution deformation measurements at the grain level are also discussed in this paper and related to the simulations.
KW - fatigue crack initiation
KW - grain boundaries
KW - grain cluster
KW - microstructure
KW - persistent slip band
UR - http://www.scopus.com/inward/record.url?scp=84880810847&partnerID=8YFLogxK
U2 - 10.1111/ffe.12048
DO - 10.1111/ffe.12048
M3 - Article
AN - SCOPUS:84880810847
VL - 36
SP - 809
EP - 826
JO - Fatigue and Fracture of Engineering Materials and Structures
JF - Fatigue and Fracture of Engineering Materials and Structures
SN - 8756-758X
IS - 8
ER -