Transition of fatigue-crack extension mechanism on a hot rolled steel with an inclined notch under cyclic tension–compression and plane strain conditions
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Abstract
The fatigue characteristics of a strain-localized material specimen with an inclined notch, subjected to cyclic tension–compression under plane strain conditions, have not been fully elucidated. An unloading elastic compliance test and electron backscattering diffraction analyses were conducted near a fatigue crack tip on inclined notched specimens of JIS-SM490YB hot-rolled steel. Crack extension caused a characteristic change in the local mean strain from zero to a positive value, corresponding to the transition from local plasticity induced by a notch to that induced by a fatigue crack. The sudden increase in local elastic compliance and negative crack opening load were the mechanical indicators of the damage accumulation mode of the fatigue crack extension mode-type.
期刊介绍：
Typical subjects discussed in International Journal of Fatigue address:
Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements)
Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading
Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions
Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions)
Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects
Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue
Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation)
Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering
Smart materials and structures that can sense and mitigate fatigue degradation
Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.
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