Unification of hydrogen-enhanced damage understanding through Strain-Life Experiments and Modeling
May L. Martin, Christopher P. Looney, Peter E. Bradley, Damian S. Lauria, Robert L. Amaro, Andrew J. Slifka
Strain-life testing of a 4130 pressure vessel steel was conducted in hydrogen gas through the careful adaptation of an existing hydrogen-gas mechanical testing apparatus. The strain-life mechanical results reveal that hydrogen has a significant effect on the strain-life, and impacts both the elastic and plastic responses of the material. Microscopy analysis shows a distinct difference in the microstructural development of the material after cyclic loading in air compared to in hydrogen gas. These experimental results will inform coupled damage and deformation modeling.