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A constitutive equation for the S–N fatigue behavior of metal single crystals and validation by the physical definition of fatigue endurance limit
- Source :
- International Journal of Fatigue. 91:21-28
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- A phenomenological constitutive equation for the stress–life (S–N) fatigue behavior of metal single crystals is presented and is validated on the basis of physical definition of fatigue endurance limit. The constitutive equation is developed here on the basis of probabilistic arguments for fatigue fracture in cyclic loading. The physical endurance limit for fatigue is taken as the stress amplitude corresponding to the critical resolved shear stress for dislocation slip initiation in ductile single crystals. It is shown that the constitutive equation is surprisingly compact and very flexible to accurately describe a wide range of S–N behaviors, as found in fatigue of nickel-based superalloy single crystals as well as in Fe and Zn single crystals. The S–N constitutive equation is also expanded by the superposition of the mean stress effect and the cyclic effect in fatigue. A remarkable outcome of this is a master S–N fatigue equation that yields S–N curves for any mean stress, on the basis of the S–N parameters for fully reversed fatigue behavior. The application of the presented equations to characterize the S–N behavior of polycrystalline materials is quite promising.
- Subjects :
- 010302 applied physics
Materials science
business.industry
Mechanical Engineering
Constitutive equation
02 engineering and technology
Structural engineering
Slip (materials science)
021001 nanoscience & nanotechnology
01 natural sciences
Fatigue limit
Industrial and Manufacturing Engineering
Computer Science::Robotics
Superalloy
Superposition principle
Amplitude
Mechanics of Materials
Modeling and Simulation
Critical resolved shear stress
0103 physical sciences
General Materials Science
Crystallite
Composite material
0210 nano-technology
business
Subjects
Details
- ISSN :
- 01421123
- Volume :
- 91
- Database :
- OpenAIRE
- Journal :
- International Journal of Fatigue
- Accession number :
- edsair.doi...........4808f09039970f523d295391a62c32ee