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10296 Influence of Fatigue Pre-Loading Level on Hydrogen-Assisted Micro-Damage in Eutectoid Steel

Picture for 10296 Influence of Fatigue Pre-Loading Level on Hydrogen-Assisted Micro-Damage in Eutectoid Steel
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Product Number: 51300-10296-SG
ISBN: 10296 2010 CP
Author: J. Toribio, Diego Vergara and Miguel Lorenzo
Publication Date: 2010
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A fracture mechanics approach to hydrogen-assisted micro-damage in eutectoid steel is presented. Fractographic analysis revealed micromechanical effects of hydrogen in the form of tearing topography surface (TTS). The progress of this micro-damage is modeled as a macroscopic crack that extends the original fatigue pre-crack and involves linear elastic fracture mechanics principles. In this case, the change from hydrogen-assisted micro-damage (TTS) to cleavage-like topography takes place when a critical stress intensity factor (KH) is reached, and this value depends on the amount of hydrogen which penetrated the vicinity of the actual crack tip (the fatigue pre-crack plus the TTS area). The present study analyzes the effect of the TTS zone aspect ratio on KH.

Keywords: Fatigue pre-loading, TTS, SIF.
A fracture mechanics approach to hydrogen-assisted micro-damage in eutectoid steel is presented. Fractographic analysis revealed micromechanical effects of hydrogen in the form of tearing topography surface (TTS). The progress of this micro-damage is modeled as a macroscopic crack that extends the original fatigue pre-crack and involves linear elastic fracture mechanics principles. In this case, the change from hydrogen-assisted micro-damage (TTS) to cleavage-like topography takes place when a critical stress intensity factor (KH) is reached, and this value depends on the amount of hydrogen which penetrated the vicinity of the actual crack tip (the fatigue pre-crack plus the TTS area). The present study analyzes the effect of the TTS zone aspect ratio on KH.

Keywords: Fatigue pre-loading, TTS, SIF.
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