Surface Reactions and Fatigue Crack Growth

Wei, Robert P.; Simmons, G.W.

doi:10.1007/978-1-4899-1736-2_3

Cited by 6 publications

(9 citation statements)

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“…Modeling of environmentally assisted fatigue crack growth in pure gases and in binary gas mixtures, where one of the components acts as an inhibitor, has been made and verified [11,12,14,15].…”

Section: Modeling Of Fatigue Crack Growth In Gaseous Environmentsmentioning

confidence: 99%

“…Modeling was based on the proposition that the rate of crack growth in a deleterious environment, (da/dN) e, is composed of the sum of three components [2,11,12]. In the model [11,12], environmental enhancement of fatigue crack growth is assumed to result from embrittlement by hydrogen that is produced by the reactions of hydrogenous gases (e.g, water vapor) with the freshly produced crack surfaces.…”

Section: Modeling Of Fatigue Crack Growth In Gaseous Environmentsmentioning

confidence: 99%

“…In the model [11,12], environmental enhancement of fatigue crack growth is assumed to result from embrittlement by hydrogen that is produced by the reactions of hydrogenous gases (e.g, water vapor) with the freshly produced crack surfaces. More specifically, (da/dN) is assumed to be proportional to the amount of of hydrog-nrod, Ad by the surface reactions during each cycle, -6-which is proportional in turn to the "effective" crack area produced by fatigue during the prior loading cycles and to the extent of surface reactions.…”

Section: Modeling Of Fatigue Crack Growth In Gaseous Environmentsmentioning

confidence: 99%

“…Based on the assumptions of Knudsen (or molecular) flow and simple first-order reaction kinetics, the following relationships were obtained for transportcontrolled and surface-reaction-controlled fatigue crack growth [11,12]:…”

Section: Modeling Of Fatigue Crack Growth In Gaseous Environmentsmentioning

confidence: 99%

“…(da/dN)cf,s represents the maximum enhancement in the rate of cycle-dependent fatigue crack growth, which recognizes that the extent of surface reaction is limited [11,12]. These models provide a quantitative procedure for assessing the influences of loading and environmental variables, and require the use of (da/dN) r and (da/dN)cf,s as experimentally measured limits for the material's response.…”

Section: Modeling Of Fatigue Crack Growth In Gaseous Environmentsmentioning

confidence: 99%

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Fracture Mechanics and Corrosion Fatigue

McEvily

Wei

1983

Corrosion Fatigue: Mechanics, Metallurgy, Electrochemistry, and Engineering

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The role of linear fracture mechanics is considered in relation to the importance of integrating chemistry, mechanics, and materials science in the development of a quantitative mechanistic understanding of corrosion fatigue. The value of and need for an integrated multidisciplinary approach are illustrated by results of studies of environmentally assisted fatigue crack growth in gaseous and aqueous environments. Corrosion fatigue of steels in aqueous environments is considered to provide new perspectives for this integrated approach. The need for treating cyclic load frequency as an important variable and for electrochemical measurements at short times (<10 s) is discussed.

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Section: Modeling Of Fatigue Crack Growth In Gaseous Environmentsmentioning

confidence: 99%

Section: Modeling Of Fatigue Crack Growth In Gaseous Environmentsmentioning

confidence: 99%

Section: Modeling Of Fatigue Crack Growth In Gaseous Environmentsmentioning

confidence: 99%

Section: Modeling Of Fatigue Crack Growth In Gaseous Environmentsmentioning

confidence: 99%

Section: Modeling Of Fatigue Crack Growth In Gaseous Environmentsmentioning

confidence: 99%

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Fracture Mechanics and Corrosion Fatigue

McEvily

Wei

1983

Corrosion Fatigue: Mechanics, Metallurgy, Electrochemistry, and Engineering

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Effect of hydrogen gas impurities on the hydrogen dissociation on iron surface

Staykov

Yamabe

Somerday

2014

Int. J. Quantum Chem.

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A small addition of oxygen to hydrogen gas is known to mitigate the hydrogen embrittlement (HE) of steels. As atomic hydrogen dissolution in steels is responsible for embrittlement, catalysis of molecular hydrogen dissociation by the steel surface is an essential step in the embrittlement process. The most probable role of oxygen in mitigating HE is to inhibit the reactions between molecular hydrogen and the steel surface. To elucidate the mechanism of such surface reaction of hydrogen with the steel in the presence of oxygen, hydrogen, and oxygen adsorption, dissociation, and coadsorption on the Fe(100) surface were investigated using density functional theory. The results show that traces of O 2 would successfully compete with H 2 for surface adsorption sites due to the grater attractive force acting on the O 2 molecule compared to H 2 . The H 2 dissociation would be hindered on iron surfaces with predissociated oxygen. Prompted by the notable results for H 2 1 O 2 , other practical systems were considered, that is, H 2 1 CO and CH 4 . Calculations were performed for the CO chemisorption and H 2 dissociation on iron surface with predissociated CO, as well as, CH 4 surface dissociation. The results indicate that CO inhibition of H 2 dissociation proceeds via similar mechanism to O 2 induced inhibition, whereas CH 4 traces in the H 2 gas have no effect on H 2 dissociation.

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