A cohesive zone framework for environmentally assisted fatigue
We present a compelling finite element framework to model hydrogen assisted fatigue by means of a hydrogen- and cycle-dependent cohesive zone formulation. The model builds upon: (i) appropriate environmental boundary conditions, (ii) a coupled mechanical and hydrogen diffusion response, driven by ch...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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Elsevier
2017
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| _version_ | 1797112757443624960 |
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| author | del Busto, S Betegón, C Martínez-Pañeda, E |
| author_facet | del Busto, S Betegón, C Martínez-Pañeda, E |
| author_sort | del Busto, S |
| collection | OXFORD |
| description | We present a compelling finite element framework to model hydrogen assisted fatigue by means of a hydrogen- and cycle-dependent cohesive zone formulation. The model builds upon: (i) appropriate environmental boundary conditions, (ii) a coupled mechanical and hydrogen diffusion response, driven by chemical potential gradients, (iii) a mechanical behavior characterized by finite deformation J2 plasticity, (iv) a phenomenological trapping model, (v) an irreversible cohesive zone formulation for fatigue, grounded on continuum damage mechanics, and (vi) a traction-separation law dependent on hydrogen coverage calculated from first principles. The computations show that the present scheme appropriately captures the main experimental trends; namely, the sensitivity of fatigue crack growth rates to the loading frequency and the environment. The role of yield strength, work hardening, and constraint conditions in enhancing crack growth rates as a function of the frequency is thoroughly investigated. The results reveal the need to incorporate additional sources of stress elevation, such as gradient-enhanced dislocation hardening, to attain a quantitative agreement with the experiments. |
| first_indexed | 2024-03-07T08:29:55Z |
| format | Journal article |
| id | oxford-uuid:ecd182d8-dc43-4a80-8892-972619215277 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T08:29:55Z |
| publishDate | 2017 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:ecd182d8-dc43-4a80-8892-9726192152772024-02-29T11:41:15ZA cohesive zone framework for environmentally assisted fatigueJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ecd182d8-dc43-4a80-8892-972619215277EnglishSymplectic ElementsElsevier2017del Busto, SBetegón, CMartínez-Pañeda, EWe present a compelling finite element framework to model hydrogen assisted fatigue by means of a hydrogen- and cycle-dependent cohesive zone formulation. The model builds upon: (i) appropriate environmental boundary conditions, (ii) a coupled mechanical and hydrogen diffusion response, driven by chemical potential gradients, (iii) a mechanical behavior characterized by finite deformation J2 plasticity, (iv) a phenomenological trapping model, (v) an irreversible cohesive zone formulation for fatigue, grounded on continuum damage mechanics, and (vi) a traction-separation law dependent on hydrogen coverage calculated from first principles. The computations show that the present scheme appropriately captures the main experimental trends; namely, the sensitivity of fatigue crack growth rates to the loading frequency and the environment. The role of yield strength, work hardening, and constraint conditions in enhancing crack growth rates as a function of the frequency is thoroughly investigated. The results reveal the need to incorporate additional sources of stress elevation, such as gradient-enhanced dislocation hardening, to attain a quantitative agreement with the experiments. |
| spellingShingle | del Busto, S Betegón, C Martínez-Pañeda, E A cohesive zone framework for environmentally assisted fatigue |
| title | A cohesive zone framework for environmentally assisted fatigue |
| title_full | A cohesive zone framework for environmentally assisted fatigue |
| title_fullStr | A cohesive zone framework for environmentally assisted fatigue |
| title_full_unstemmed | A cohesive zone framework for environmentally assisted fatigue |
| title_short | A cohesive zone framework for environmentally assisted fatigue |
| title_sort | cohesive zone framework for environmentally assisted fatigue |
| work_keys_str_mv | AT delbustos acohesivezoneframeworkforenvironmentallyassistedfatigue AT betegonc acohesivezoneframeworkforenvironmentallyassistedfatigue AT martinezpanedae acohesivezoneframeworkforenvironmentallyassistedfatigue AT delbustos cohesivezoneframeworkforenvironmentallyassistedfatigue AT betegonc cohesivezoneframeworkforenvironmentallyassistedfatigue AT martinezpanedae cohesivezoneframeworkforenvironmentallyassistedfatigue |