Back to Search
Start Over
Some observations on short fatigue cracks under biaxial fatigue
- Source :
- Theoretical and Applied Fracture Mechanics. 80:96-103
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- This work presents a new methodology for evaluating crack initiation under biaxial conditions. The methodology consists of evaluating a number of crack parameters automatically with digital processing of high-magnification images of the crack. Five different strain conditions were evaluated on a low carbon ferritic–pearlitic steel specimen with tubular shape. A hole of 150 μm diameter was drilled to enforce the crack to initiate at a particular spot. Different combinations of axial and torsional strains were analysed during the initiation stage of the crack. Fatigue crack propagation curves clearly showed oscillations due to microstructure. It was also observed that these oscillations decreased as the torsional component of the strain was increased. Driving force was also evaluated in crack opening and sliding direction through crack opening displacement and crack sliding displacement. The results demonstrate that crack opening displacement is sensitive to microstructural barriers and crack sliding displacement is sensitive to crack deviations caused by the microstructure.
- Subjects :
- Materials science
business.industry
Applied Mathematics
Mechanical Engineering
Work (physics)
Crack tip opening displacement
Structural engineering
Paris' law
Condensed Matter Physics
Crack growth resistance curve
Microstructure
Displacement (vector)
Crack closure
mental disorders
General Materials Science
business
Stress concentration
Subjects
Details
- ISSN :
- 01678442
- Volume :
- 80
- Database :
- OpenAIRE
- Journal :
- Theoretical and Applied Fracture Mechanics
- Accession number :
- edsair.doi...........3379383116009c69cc07b366810de4dc