Hydrogen Aggressive Media Impact on Cycling Durability of Structure Components

Abstract:

To develop modern CAE systems for durable and reliable structure components design, mathematical modeling of environmentally assisted metal cracking becomes very important. For structure components exploited in aggressive environment and under cyclic load, it is a problem of today. Besides, mathematical rule of damage accumulation of different causes (for instance, hydrogen media impact and cycling) is rarely used in CAE systems, but if such rule was used, crack propagation simulation considering several damage causes would be possible.Environmentally assisted metal cracking model (developed earlier by authors) is described in the paper. This model considers cyclic load and hydrogen embrittlement, the most important characteristics of which are hydrogen environmental concentration and load frequency respectively.The authors’ model successfully predicts effect, known from certain experimental data, that the greater is the frequency, the less hydrogen embrittlement affects fatigue cracks propagation and, vice-versa, that there are certain boundaries of cycling frequency for which embrittlement effect is comparably big.Such boundaries of frequency were numerically estimated by means of the presented model. Plots showing dependency of the component’s life on different defect and loading features are shown.

• Periodical: Materials Science Forum (Volume 844)
• Pages: 27-30
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.844.27
• Online since: March 2016
• Authors: Daniel L. Kishlakov*, Pavel V. Tarakanov, Georgy V. Shashurin, Yury V. Berchun
• Keywords: CAE, Crack Propagation, Hydrogen Embrittlement, Industrial Safety, Life

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