A Prediction of Methodology for the High Cycle Fatigue Life of Hydrogen-Loaded Structures

Kurzfassung

An ultrasonic high cycle fatigue (HCF) test bench was used for a detailed experimental investigation of the quantitative influence of internal hydrogen on the HCF life of Inconel X-750® in the hydrogen concentration range from 5 to 39 wppm at ambient temperature. For an alternating stress equal to 0.6 times the yield stress of the hydrogen-free material and zero mean stress, a drop of two orders of magnitude in the high-cycle fatigue durability of the material has been measured over the investigated hydrogen concentration range. New Finite Element (F.E.) analysis post processing tools have been developed to predict with relatively little effort the drop in life duration due to internal hydrogen embrittlement at steady state hydrogen concentration conditions. The core of this proposed F.E. calculation-based method is the “Wöhler surface”, i.e. a conventional Wöhler curve extended by the hydrogen concentration as the third dimension. A two-step validation / verification of this F.E. post processing analysis method has been performed.

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