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Fatigue of high strength steels in sea water
- Date Issued:
- 1988
- Summary:
- Fatigue response of selected high strength steels in seawater was investigated under conditions relevant to tension leg platform tendon applications. This involved both freely corroding and cathodically protected, displacement controlled experiments upon constant taper, bending specimens which were either notched or welded, ground and post weld heat treated. High stress range freely corroding results indicated enhanced life compared to structural steel, whereas at low stress range the opposite was true. Corrections made to the high strength steel and structural steel data to correspond to similar test conditions revealed no benefit of enhanced material strength on corrosion fatigue life. Fatigue life for all cathodically protected specimens exceeded that for the freely corroding ones, and with one exception testing was terminated prior to failure. The single cathodically protected specimen failure involved a stress range approximately one-third the value for other specimens which were run-outs. This suggests that an environmental cracking process may operate precipitously at relatively low stress amplitudes (alternately, high R values). Fatigue life for freely corroding notched specimens was less than for grounded PWHT specimens, the difference increasing with decreasing amplitude.
Title: | Fatigue of high strength steels in sea water. |
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Name(s): |
Sablok, Anil Kumar. Florida Atlantic University, Degree grantor Hartt, William H., Thesis advisor College of Engineering and Computer Science Department of Ocean and Mechanical Engineering |
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Type of Resource: | text | |
Genre: | Electronic Thesis Or Dissertation | |
Issuance: | monographic | |
Date Issued: | 1988 | |
Publisher: | Florida Atlantic University | |
Place of Publication: | Boca Raton, Fla. | |
Physical Form: | application/pdf | |
Extent: | 64 p. | |
Language(s): | English | |
Summary: | Fatigue response of selected high strength steels in seawater was investigated under conditions relevant to tension leg platform tendon applications. This involved both freely corroding and cathodically protected, displacement controlled experiments upon constant taper, bending specimens which were either notched or welded, ground and post weld heat treated. High stress range freely corroding results indicated enhanced life compared to structural steel, whereas at low stress range the opposite was true. Corrections made to the high strength steel and structural steel data to correspond to similar test conditions revealed no benefit of enhanced material strength on corrosion fatigue life. Fatigue life for all cathodically protected specimens exceeded that for the freely corroding ones, and with one exception testing was terminated prior to failure. The single cathodically protected specimen failure involved a stress range approximately one-third the value for other specimens which were run-outs. This suggests that an environmental cracking process may operate precipitously at relatively low stress amplitudes (alternately, high R values). Fatigue life for freely corroding notched specimens was less than for grounded PWHT specimens, the difference increasing with decreasing amplitude. | |
Identifier: | 14463 (digitool), FADT14463 (IID), fau:11262 (fedora) | |
Collection: | FAU Electronic Theses and Dissertations Collection | |
Note(s): |
College of Engineering and Computer Science Thesis (M.S.)--Florida Atlantic University, 1988. |
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Subject(s): |
Steel--Fatigue Steel, High strength |
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Held by: | Florida Atlantic University Libraries | |
Persistent Link to This Record: | http://purl.flvc.org/fcla/dt/14463 | |
Sublocation: | Digital Library | |
Use and Reproduction: | Copyright © is held by the author, with permission granted to Florida Atlantic University to digitize, archive and distribute this item for non-profit research and educational purposes. Any reuse of this item in excess of fair use or other copyright exemptions requires permission of the copyright holder. | |
Use and Reproduction: | http://rightsstatements.org/vocab/InC/1.0/ | |
Host Institution: | FAU | |
Is Part of Series: | Florida Atlantic University Digital Library Collections. |