Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"Hydrogen Effect"”.
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Micromechanics of the Hydrogen Effect on Plasticity and Interfacial Decohesion
… the cohesion of an interface in the presence of hydrogen is suggested and implemented through interfacial cohesive finite elements to study interfacial debonding around an elastic particle imbedded in an elastoplastically deforming matrix, while transient hydrogen transport takes place in the …
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Mechanisms of Ductile Fracture: Void Growth by Dislocation -Loop Emission and Hydrogen-Assisted Crack Propagation
The effect of hydrogen interstitials on void growth and coalescence has been investigated during crack propagation in materials which fail by ductile processes in the presence of hydrogen. First the hydrogen effect on dislocation mobility and lattice dilatation was considered to establish the …
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On mitigation of hydrogen embrittlement and theoretical modeling of hydrogen accelerated fatigue crack growth
Hydrogen embrittlement and fatigue are two modes of structural materials failure for which mechanistic understanding is still lacking. In addition, it has been found experimentally that concurrent cyclic loading and hydrogen gas exposure can lead to enhanced fatigue crack growth rates. This work …
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Evaluation of cracking and localized corrosion behavior of cladding materials
… evaluation of stress corrosion cracking (SCC), hydrogen embrittlement (HE) and localized corrosion (pitting and crevice) susceptibility of zircaloy-2 and zircaloy-4 in neutral and acidic solutions at 30, 60, 90°C. Constant-load and slow-strain-rate (SSR) testing methods were used to evaluate …
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On the mechanics of the hydrogen interaction with single crystal plasticity
This thesis presents a model to simulate the effects of hydrogen on the mechanical behavior of single crystals. A macroscopic crystal plasticity model is formulated based on the fundamentals of the hydrogen-dislocation interactions. Various hardening evolution equations are investigated and …
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Ionic self-assembly of porphyrin micro-nano structures for solar hydrogen evolution
… energy harvesting and conversion to desired hydrogen. Effect of reaction time, growth temperature, ionic strength, and metal interchange on the self-assembly process of these micro-nano structures is studied. I have also investigated the ability of these porphyrin micro-nano structures to …
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Lattice to continuum: A theoretical framework to calculate elastic fields in lattice scale
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-05-01