Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Multiaxial fatigue in drill pipes under non-proportional loading
The scope of this research is to estimate the fatigue life of drill pipes subjected to multiaxial state of stress. Several approaches that model and estimate fatigue life under non-proportional multiaxial loading were investigated. The critical plane approach was chosen with Fatemi and Socie numeric...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Published: |
AUC Knowledge Fountain
2016
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613409445412864 |
|---|---|
| access_status_str | Open Access |
| author | Helmy, Nahla |
| author_browse | Helmy, Nahla |
| author_facet | Helmy, Nahla |
| author_sort | Helmy, Nahla |
| collection | Thesis |
| dc_rights_str_mv | The author retains all rights with regard to copyright. The author certifies that written permission from the owner(s) of third-party copyrighted matter included in the thesis, dissertation, paper, or record of study has been obtained. The author further certifies that IRB approval has been obtained for this thesis, or that IRB approval is not necessary for this thesis. Insofar as this thesis, dissertation, paper, or record of study is an educational record as defined in the Family Educational Rights and Privacy Act (FERPA) (20 USC 1232g), the author has granted consent to disclosure of it to anyone who requests a copy. |
| description | The scope of this research is to estimate the fatigue life of drill pipes subjected to multiaxial state of stress. Several approaches that model and estimate fatigue life under non-proportional multiaxial loading were investigated. The critical plane approach was chosen with Fatemi and Socie numerical model. A software program (Elrond) was constructed to estimate the fatigue life for non-proportional loading. The code was validated using previous researchers experimental fatigue data sets. The developed software was then applied to a real life drilling problem. The “Build and Hold” drilling job condition was analyzed using the developed software. Results were compared with the API RP7G fatigue design guidelines. Fatigue life charts were prepared using fatigue lives estimated by Elrond at several axial loading, dogleg severities and axial torque amplitudes. Also cumulative fatigue life charts using fatigue life values from Elrond were calculated according to the method of Hansford and Lubinski developed, and used in API RP7G. Elrond results were less conservative than the API results, especially for low values of axial torque. |
| format | Thesis |
| id | oai:fount.aucegypt.edu:etds-1313 |
| institution | American University in Cairo (Egypt) |
| last_indexed | 2026-06-10T12:35:41.195Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from AUC Knowledge Fountain — bepress |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | AUC Knowledge Fountain |
| publisherStr | AUC Knowledge Fountain |
| record_format | dspace |
| source_str | AUC Knowledge Fountain — bepress |
| spelling | oai:fount.aucegypt.edu:etds-1313 Multiaxial fatigue in drill pipes under non-proportional loading Helmy, Nahla The scope of this research is to estimate the fatigue life of drill pipes subjected to multiaxial state of stress. Several approaches that model and estimate fatigue life under non-proportional multiaxial loading were investigated. The critical plane approach was chosen with Fatemi and Socie numerical model. A software program (Elrond) was constructed to estimate the fatigue life for non-proportional loading. The code was validated using previous researchers experimental fatigue data sets. The developed software was then applied to a real life drilling problem. The “Build and Hold” drilling job condition was analyzed using the developed software. Results were compared with the API RP7G fatigue design guidelines. Fatigue life charts were prepared using fatigue lives estimated by Elrond at several axial loading, dogleg severities and axial torque amplitudes. Also cumulative fatigue life charts using fatigue life values from Elrond were calculated according to the method of Hansford and Lubinski developed, and used in API RP7G. Elrond results were less conservative than the API results, especially for low values of axial torque. 2016-02-01T08:00:00Z thesis application/pdf https://fount.aucegypt.edu/etds/314 https://fount.aucegypt.edu/context/etds/article/1313/viewcontent/Multiaxial_20Fatigue_20in_20Drill_20Pipes_20Under_20Non_Proportional_20Loading.pdf The author retains all rights with regard to copyright. The author certifies that written permission from the owner(s) of third-party copyrighted matter included in the thesis, dissertation, paper, or record of study has been obtained. The author further certifies that IRB approval has been obtained for this thesis, or that IRB approval is not necessary for this thesis. Insofar as this thesis, dissertation, paper, or record of study is an educational record as defined in the Family Educational Rights and Privacy Act (FERPA) (20 USC 1232g), the author has granted consent to disclosure of it to anyone who requests a copy. Theses and Dissertations AUC Knowledge Fountain Fatigue Multiaxial |
| spellingShingle | Fatigue Multiaxial Helmy, Nahla Multiaxial fatigue in drill pipes under non-proportional loading |
| title | Multiaxial fatigue in drill pipes under non-proportional loading |
| title_full | Multiaxial fatigue in drill pipes under non-proportional loading |
| title_fullStr | Multiaxial fatigue in drill pipes under non-proportional loading |
| title_full_unstemmed | Multiaxial fatigue in drill pipes under non-proportional loading |
| title_short | Multiaxial fatigue in drill pipes under non-proportional loading |
| title_sort | multiaxial fatigue in drill pipes under non proportional loading |
| topic | Fatigue Multiaxial |
| url | https://fount.aucegypt.edu/etds/314 https://fount.aucegypt.edu/context/etds/article/1313/viewcontent/Multiaxial_20Fatigue_20in_20Drill_20Pipes_20Under_20Non_Proportional_20Loading.pdf |
| work_keys_str_mv | AT helmynahla multiaxialfatigueindrillpipesundernonproportionalloading |