Transient and Steady State Regimes of Fatigue Crack Growth in High Strength Steel

Jesús Toribio; Beatriz González; Juan Carlos Matos

doi:10.4028/www.scientific.net/KEM.525-526.553

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 525-526Transient and Steady State Regimes of Fatigue...

Transient and Steady State Regimes of Fatigue Crack Growth in High Strength Steel

Abstract:

This paper analyzes the propagation of fatigue cracks in pearlitic steel in two forms, hot rolled bar and cold drawn wire. The experimental procedure consisted of fatigue tests on bars under tensile loading, using steps with decreasing amplitude of stress and constant stress range during each step. The curves plotting cyclic crack growth rate versus stress intensity factor range show a main steady-state regime preceded by transient paths. The steady-state regime is associated with the curves of the Paris regime. The cold drawing process improves the fatigue behaviour of steel by retarding the cyclic crack growth rate, and the propagation rate is not dependent on the R-ratio. The transient branches allow one to calculate the plastic zone size, considering that they are a consequence of the overload retardation effect at each step change, and a unique expression is fitted as a function of K_maxΔK product and of the conventional mechanical properties.

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Periodical:

Key Engineering Materials (Volumes 525-526)

Pages:

553-556

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.525-526.553

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Online since:

November 2012

Authors:

Jesús Toribio, Beatriz González, Juan Carlos Matos

Keywords:

Cold-Drawn Steel, Overload Retardation Effect, Paris Curve, Plastic Zone Size, R-Ratio

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