APPLICATION OF A MODEL OF HYDROGEN-ASSISTED FATIGUE CRACK GROWTH IN 4130 STEEL

Published

July 31, 2017

Author(s)

Andrew Slifka, Robert L. Amaro, Devin T. O'Connor, Benjamin E. Long, Elizabeth S. Drexler

Abstract

In this work, we applied a finite element model to predict the cyclic lifetime of 4130 steel cylinders under the influence of hydrogen. This example is used to demonstrate the efficacy of a fatigue crack growth (FCG) model we have developed. The model was designed to be robust and incorporate features of stress-assisted hydrogen diffusion, large-scale plasticity, hydrogen gas pressure, loading frequency, and effects of microstructure. The model was calibrated to the 4130 steel material by use of tensile tests and experimental FCG results of a compact tension specimen. We then used the model to predict the hydrogen-assisted FCG rate and cycle life of a pressurized cylinder with a deliberate initial thumbnail crack. The results showed good correlation to the cyclic lifetime results of 4130 pressurized cylinders found in the literature.

Proceedings Title

Proceeding of the International Hydrogen Conference 2016

Conference Dates

September 11-14, 2016

Conference Location

Moran, WY, US

Conference Title

International Hydrogen Conference 2016

Pub Type

Conferences

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Keywords

fatigue crack growth rate, hydrogen, modeling, pipeline, steel

Citation

Slifka, A. , Amaro, R. , O'Connor, D. , Long, B. and Drexler, E. (2017), APPLICATION OF A MODEL OF HYDROGEN-ASSISTED FATIGUE CRACK GROWTH IN 4130 STEEL, Proceeding of the International Hydrogen Conference 2016, Moran, WY, US, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=921590 (Accessed September 19, 2024)