What is it about?

The synergetic effects between ultrasonic vibration fatigue life and synergistically active hydrogen embrittlement (HE) mechanisms in low carbon bcc steel (S355J2+N, equivalent to ASTM A656), according to the HELP + HEDE model for hydrogen embrittlement, is modeled for the first time using the unified mechanics theory (UMT) and also thoroughly discussed.

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Why is it important?

The original contribution of this paper is the derivation of the fundamental thermodynamic equation of pre-hydrogen embrittled bcc steel subjected to ultrasonic very high cycle fatigue and the numerical simulations of fatigue life estimation using the proposed novel model. The entropy production due to hydrogen-enhanced mechanisms, the synergistic action, and the interplay of hydrogen embrittlement (HE) mechanisms (HELP + HEDE) during fatigue is formulated, modeled, implemented, and critically discussed within the framework of the UMT approach.


The HELP + HEDE model for the synergistic action of the hydrogen embrittlement mechanism is thoroughly reviewed, discussed, and applied. The subsection of this paper is devoted to critical hydrogen concentration, hydrogen-dislocation interactions, and the synergy of HE mechanisms.

Professor Milos B. Djukic
University of Belgrade, Faculty of Mechanical Engineering

Read the Original

This page is a summary of: Modeling fatigue life and hydrogen embrittlement of bcc steel with unified mechanics theory, International Journal of Hydrogen Energy, March 2023, Elsevier,
DOI: 10.1016/j.ijhydene.2023.02.110.
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