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INFLUENCE OF CATHODIC PROTECTION UPON CONSTANT DEFLECTION FATIGUE TESTS ON NOTCHED 1018 STEEL IN SEA WATER

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Date Issued:
1979
Summary:
Constant deflection fatigue experiments performed on cathodically protected, notched steel bars in natural sea water produced stresses which caused short cracks to appear soon after the beginning of testing . At stresses above 22 ksi (152 MN/m^2), cracks grew continuously across the bars. At stresses below 22 ksi (152 MN/m^2), and at potentials of -1.20 volts , saturated calomel electrode SCE, cracks did not grow, or arrested part way across the bar. At potentials other than - 1.20 volts , SCE, stress levels had to be less than 19 ksi (131 MN/m^2), before crack growth could be arrested. Strain gage readings suggest calcareous material may be forming on the fracture surfaces of cracks in which growth was arrested. Examination of these surfaces shows a pattern of calcareous deposit and corrosion product which suggests a potential gradient within the crack electrolyte. A mathematical model is presented which describes this potential gradient.
Title: THE INFLUENCE OF CATHODIC PROTECTION UPON CONSTANT DEFLECTION FATIGUE TESTS ON NOTCHED 1018 STEEL IN SEA WATER.
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Name(s): MARTIN, PHILIP EDWARD
Florida Atlantic University, Degree Grantor
Type of Resource: text
Genre: Electronic Thesis Or Dissertation
Issuance: monographic
Date Issued: 1979
Publisher: Florida Atlantic University
Place of Publication: Boca Raton, Fla.
Physical Form: application/pdf
Extent: 70 p.
Language(s): English
Summary: Constant deflection fatigue experiments performed on cathodically protected, notched steel bars in natural sea water produced stresses which caused short cracks to appear soon after the beginning of testing . At stresses above 22 ksi (152 MN/m^2), cracks grew continuously across the bars. At stresses below 22 ksi (152 MN/m^2), and at potentials of -1.20 volts , saturated calomel electrode SCE, cracks did not grow, or arrested part way across the bar. At potentials other than - 1.20 volts , SCE, stress levels had to be less than 19 ksi (131 MN/m^2), before crack growth could be arrested. Strain gage readings suggest calcareous material may be forming on the fracture surfaces of cracks in which growth was arrested. Examination of these surfaces shows a pattern of calcareous deposit and corrosion product which suggests a potential gradient within the crack electrolyte. A mathematical model is presented which describes this potential gradient.
Identifier: 13986 (digitool), FADT13986 (IID), fau:10808 (fedora)
Note(s): Thesis (M.S.E.)--Florida Atlantic University, 1979.
Subject(s): Steel--Fatigue
Held by: Florida Atlantic University Libraries
Persistent Link to This Record: http://purl.flvc.org/fcla/dt/13986
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.
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Host Institution: FAU
Is Part of Series: Florida Atlantic University Digital Library Collections.