Micromechanical modeling of fatigue crack initiation in polycrystals

Fatigue is an important mechanism for the failure of components in many engineering applications and a significant proportion of the fatigue life is spent in the crack initiation phase. Although a large number of research work addresses fatigue life and fatigue crack growth, the problem of modeling...

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Published in:Journal of materials research 2017-12, Vol.32 (23), p.4375-4386
Main Authors: Boeff, Martin, Hassan, Hamad ul, Hartmaier, Alexander
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Biomaterials
Crack initiation
Crack propagation
Deformation
Deformation mechanisms
Dislocations
Failure mechanisms
Fatigue failure
Fatigue life
Ferritic stainless steel
Fracture mechanics
Grain boundaries
Inorganic Chemistry
Materials Engineering
Materials research
Materials Science
Metal fatigue
Microstructure
Modelling
Nanotechnology
Plastic deformation
Polycrystals
Propagation
S N diagrams
Shear stress
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description Fatigue is an important mechanism for the failure of components in many engineering applications and a significant proportion of the fatigue life is spent in the crack initiation phase. Although a large number of research work addresses fatigue life and fatigue crack growth, the problem of modeling crack initiation remains a major challenge in the scientific and engineering community. In the present work, a micromechanical model is developed and applied to study fatigue crack initiation. In particular, the effect of different hardening mechanisms on fatigue crack initiation is investigated. To accomplish this, a model describing the evolution of the particular dislocation structures observed under cyclic plastic deformation is implemented and applied on randomly generated representative microstructures to investigate fatigue crack initiation. Finally, a method is presented to calculate the S–N curve for the polycrystalline materials. With this work, it is demonstrated how the micromechanical modeling can support the understanding of damage and failure mechanisms occurring during fatigue.
doi_str_mv 10.1557/jmr.2017.384
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source ABI/INFORM Global; Springer Nature
subjects Applied and Technical Physics
Biomaterials
Crack initiation
Crack propagation
Deformation
Deformation mechanisms
Dislocations
Failure mechanisms
Fatigue failure
Fatigue life
Ferritic stainless steel
Fracture mechanics
Grain boundaries
Inorganic Chemistry
Materials Engineering
Materials research
Materials Science
Metal fatigue
Microstructure
Modelling
Nanotechnology
Plastic deformation
Polycrystals
Propagation
S N diagrams
Shear stress
title Micromechanical modeling of fatigue crack initiation in polycrystals
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