Ultrahigh Plasticity Behavior of Metallic Materials in the Ultra-High-Cycle (or Gigacycle, Very-High-Cycle) Fatigue Regime

Abstract:

This research concerns the metals behavior as varying, with increasing cyclic stress level, in the transition range between the ultrahigh cycle (UHCF) and high cycle (HCF) fatigue regimes. Having analyzed the synergetics of surface crack initiation, the authors propose to identify the UHCF-to-HCF transition with a certain stress level corrected, with the respective dimensionless functions, for the effect of the environmental attacks, temperature, surface roughness of the test piece, etc. on the crack initiation behavior. Subsurface initiation of a fatigue crack occurs in the test-material susceptible of a deformation-induced transition to superplasticity state, which favors formation of the nanocrystalline zone bordered by a fine-granular area Another case of subsurface cracking is in that a local even area forms owing to the vortex-like deformation combined with the diffusion of the retained gases toward and into the discontinuity. A proposed equation is plainly descriptive of the subsurface growth of fatigue-cracks and allowing to acquire the crack growth duration from the fractography data.Nomenclature

• Periodical: Key Engineering Materials (Volume 664)
• Pages: 231-245
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.664.231
• Online since: September 2015
• Authors: Andrey Shanyavskiy*
• Keywords: Bifurcation, Growth of Cracks, Initiation of Cracks, Superplasticity, Synergetics, Ultrahigh Cycle Fatigue

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