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ABSTRACT

On the Validity of the Fracture Mechanics Approach to Hydrogen Assisted Cracking

J. Toribio1, V. Kharin2

Materials Engineering Department, University of Salamanca, Campus Viriato, 49022 Zamora, Spain
Materials Engineering Department, University of Salamanca, Campus Viriato, 49022 Zamora, Spain

The International Conference on Computational & Experimental Engineering and Sciences 2008, 7(3), 135-140. https://doi.org/10.3970/icces.2008.007.135

Abstract

This paper deals with the meaning and significance of the fracture mechanics approach to hydrogen assisted cracking, analyzing the question of K-dominance not only over the purely mechanical aspects, but also over the environmental (physicochemical) events. Two key factors able to violate the uniqueness of the crack growth kinetics curve v = v(K) are discussed: the role of far field (the stress-strain field which is not K-dominated) and the effect of the history of hydrogenation and crack growth. The far field is shown to have a minor effect on near-tip hydrogen diffusion, and thus it can only widen the scatter band of crack growth rates in the near-threshold portion of the v(K)-curve. With regard to the effect of history, the study reveals that hydrogenation and crack growth are coupled processes, one influencing the other, so the crack growth kinetics curve v = v(K) is not unique, although a special regime of steady-state crack growth is seen to exist in which hydrogen assisted cracking turns out to be a K-dominated process, and the corresponding plot of the steady-state v against K acquires the uniqueness of a material’s characteristic curve useful in engineering.

Cite This Article

APA Style
Toribio, J., Kharin, V. (2008). On the validity of the fracture mechanics approach to hydrogen assisted cracking. The International Conference on Computational & Experimental Engineering and Sciences, 7(3), 135-140. https://doi.org/10.3970/icces.2008.007.135
Vancouver Style
Toribio J, Kharin V. On the validity of the fracture mechanics approach to hydrogen assisted cracking. Int Conf Comput Exp Eng Sciences . 2008;7(3):135-140 https://doi.org/10.3970/icces.2008.007.135
IEEE Style
J. Toribio and V. Kharin, "On the Validity of the Fracture Mechanics Approach to Hydrogen Assisted Cracking," Int. Conf. Comput. Exp. Eng. Sciences , vol. 7, no. 3, pp. 135-140. 2008. https://doi.org/10.3970/icces.2008.007.135



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