Scales of Metal Fatigue Failures and Mechanisms for Origin of Subsurface Fracture Formation

Andrey Shanyavskiy

doi:10.4028/www.scientific.net/SSP.258.249

Paper Titles

On the Influence of Internal Void Size on the Fracture Stress of Constrained Solder Joints
p.229

Prediction of Elastic Constants of Carbon Fabric/Polyurethane Composites
p.233

Crack Growth Studies in a Welded Ni-Base Superalloy
p.237

Fatigue Crack Propagation in Haynes 230: A Comparison between Single and Polycrystal Crack Closure Levels
p.243

Scales of Metal Fatigue Failures and Mechanisms for Origin of Subsurface Fracture Formation
p.249

The Influence of Microstructure Heterogeneities on the Very High Cycle Fatigue Behavior of Duplex Stainless Steel
p.255

Hydrogen-Induced Ductility Loss of Austenitic Stainless Steels for Slow Strain Rate Tensile Testing in High-Pressure Hydrogen Gas
p.259

Intrinsic Behaviour of Mode II and Mode III Long Fatigue Cracks in Zirconium and the Ti-6Al-4V Alloy
p.265

Grain Size Effect on Low Cycle Fatigue Behavior of High Strength Structural Materials
p.269

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Scales of Metal Fatigue Failures and Mechanisms for Origin of Subsurface Fracture Formation

Abstract:

Three fatigue regimes in accordance with three scale levels are considered and mechanisms of fatigue crack origination subsurface discussed. Surface hardening procedure can be used for the transition area of the crack origination from surface to subsurface in High-Cycle-Fatigue (meso-scale level) regime. In this case subsurface cracking characterized the same fatigue curve that was constructed for the Very-High-Cycle-Fatigue (micro-scale level) regimes due to the same mechanism of metals cracking. This effect was considered for Al-and Fe-based alloys. Subsurface crack origination can be received because of introduction of residual compressive stresses in the bulk material in the Low-Cycle-Fatigue (macro-scale-level) regime. The unified or master fatigue curve can be constructed for all scale levels for metals if subsurface crack origination will be realized because of hardening procedures for meso-and macro-scale levels. Subsurface crack origination in Very-High-Cycle-Fatigue regime for Ti-based alloy in the case of torsion is also discussed and three scale levels for fatigue regimes are demonstrated.

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Periodical:

Solid State Phenomena (Volume 258)

Pages:

249-254

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.258.249

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Online since:

December 2016

Authors:

Andrey Shanyavskiy*

Keywords:

Fatigue, Lifetime, Mechanisms, Scale Levels, Subsurface Cracking, Unified Description

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