TY - JOUR
T1 - Hydrogen transport and large strain elastoplasticity near a notch in alloy X-750
AU - Lufrano, J.
AU - Sofronis, P.
AU - Symons, D.
N1 - Funding Information:
The authors would like to thank Professor N. Aravas for many helpful discussions on the solution methodology of the large strain elastic–plastic boundary value problem. J. Lufrano and P. Sofronis were supported by the Department of Energy under grant DEFG02-91ER45439.
PY - 1998
Y1 - 1998
N2 - The finite element method is used to solve the coupled large strain elasloplasticity boundary value problem and transient hydrogen diffusion initial boundary value problem. As an example, solutions are obtained in the neighborhood of a rounded notch in a 4-point bend specimen of alloy X-750 at two temperatures under plane strain deformation conditions. The model accounts for the dilatational strain caused by the presence of hydrogen in the lattice and the hydrostatic stress induced drift of hydrogen. The hydrogen population profiles in both normal interstitial lattice sites (NILS) and trapping sites are calculated and conditions for the predominance of the total amount of hydrogen by either of the populations are studied. The competition between hydrostatic stress and plastic strain in the enhancement of local hydrogen concentrations is investigated. The effect of different types of traps on the relative level of trapped hydrogen as a portion of the total hydrogen is examined, The numerical analysis in conjunction with current experimental evidence suggests a specifically designed line of experiments that will isolate the parameters crucial to hydrogen induced material degradation in X-750. (o 1998 Elsevier Science Ltd. All rights reserved.
AB - The finite element method is used to solve the coupled large strain elasloplasticity boundary value problem and transient hydrogen diffusion initial boundary value problem. As an example, solutions are obtained in the neighborhood of a rounded notch in a 4-point bend specimen of alloy X-750 at two temperatures under plane strain deformation conditions. The model accounts for the dilatational strain caused by the presence of hydrogen in the lattice and the hydrostatic stress induced drift of hydrogen. The hydrogen population profiles in both normal interstitial lattice sites (NILS) and trapping sites are calculated and conditions for the predominance of the total amount of hydrogen by either of the populations are studied. The competition between hydrostatic stress and plastic strain in the enhancement of local hydrogen concentrations is investigated. The effect of different types of traps on the relative level of trapped hydrogen as a portion of the total hydrogen is examined, The numerical analysis in conjunction with current experimental evidence suggests a specifically designed line of experiments that will isolate the parameters crucial to hydrogen induced material degradation in X-750. (o 1998 Elsevier Science Ltd. All rights reserved.
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U2 - 10.1016/S0013-7944(97)00142-2
DO - 10.1016/S0013-7944(97)00142-2
M3 - Article
AN - SCOPUS:0032036272
SN - 0013-7944
VL - 59
SP - 827
EP - 845
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
IS - 6
ER -