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dc.contributor.advisorEl-Awady, Jaafar A.en_US
dc.contributor.authorMolaeinia, Zaraen_US
dc.date.accessioned2015-09-16T04:10:42Z
dc.date.available2015-09-16T04:10:42Z
dc.date.created2015-05en_US
dc.date.issued2015-05-11en_US
dc.date.submittedMay 2015en_US
dc.identifier.urihttp://jhir.library.jhu.edu/handle/1774.2/38069
dc.description.abstractThe effect of hydrogen on dislocation-Impurity atom interactions is studied under conditions where hydrogen is in equilibrium with local stresses and in systems where hydrogen increases the elastic modulus. The problem is investigated for the plane strain case, where the effect of hydrogen is modeled by a continuous distribution of dilatation lines whose strength depends on the local hydrogen concentration. The iterative finite element analysis used to calculate the hydrogen distribution accounts for the stress relaxation associated with the hydrogen Induced volume and the elastic moduli changes due to hydrogen. Modeling of the hydrogen effects on the edge dislocation-interstitial solute atom interaction is discussed using a finite element analysis and the atom interaction energies are calculated in the presence of hydrogen. The interaction includes the effect of both the first and the second order terms of interaction energies, effects of initial concentration of hydrogen on diffused concentration near and far away from the dislocations. The models have been employed to evaluate all effects on a single dislocation, two dislocations in a same slip planes, and randomly-distributed. The computational scheme is compared to literature with a very good agreement.en_US
dc.format.mimetypeapplication/pdfen_US
dc.publisherJohns Hopkins University
dc.subjectHydrogen diffusionen_US
dc.subjectdislocationen_US
dc.subjectinteraction energyen_US
dc.subjecthydrogen concentrationen_US
dc.titleNON-LINEAR FINITE ELEMENT SIMULATIONS OF HYDROGEN DIFFUSION AND HYDROGEN-DISLOCATION INTERACTIONSen_US
dc.typeThesisen_US
thesis.degree.disciplineMechanical Engineeringen_US
thesis.degree.grantorJohns Hopkins Universityen_US
thesis.degree.grantorWhiting School of Engineeringen_US
thesis.degree.levelMastersen_US
thesis.degree.nameM.S.E.en_US
dc.type.materialtexten_US
thesis.degree.departmentMechanical Engineeringen_US
dc.contributor.committeeMemberPapanikolaou, Stefanosen_US


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