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EFFECTS OF NATURAL SEAWATER AND CATHODIC POLARIZATION OF HIGH CYCLE FATIGUE OF 5086-H34 ALUMINUM

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Date Issued:
1977
Summary:
High cycle fatigue tests were conducted using symmetrical center cracked plate specimens in air, sea water and constant potentials of -1.0V and -1.3V(SCE) at 20 Hz. (1200 cycles per minute) to determine what effect these environments had on crack growth rates, delta a/delta n (inches per cycle), of 5086-H34 aluminum when plotted against stress intensity range, delta K (Ksi root of in). Crack growth rates of 10^-8 inches per cycle were obtained which indicated that apparent threshold stress intensities, delta K th, exist which are the same for air, sea water and a constant potential of -1.0V(SCE); however, under a constant potential of -1.3V(SCE) the threshold shifts to a significantly higher value. It was also observed that the different enviroments had a pronounced effect on crack growth rate only at low stress intensities. Several mechanisms are considered to explain this behavior.
Title: EFFECTS OF NATURAL SEAWATER AND CATHODIC POLARIZATION OF HIGH CYCLE FATIGUE OF 5086-H34 ALUMINUM.
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Name(s): FLODDER, STEVEN PAUL.
Florida Atlantic University, Degree grantor
Hartt, William H., Thesis advisor
Type of Resource: text
Genre: Electronic Thesis Or Dissertation
Issuance: monographic
Date Issued: 1977
Publisher: Florida Atlantic University
Place of Publication: Boca Raton, Fla.
Physical Form: application/pdf
Extent: 38 p.
Language(s): English
Summary: High cycle fatigue tests were conducted using symmetrical center cracked plate specimens in air, sea water and constant potentials of -1.0V and -1.3V(SCE) at 20 Hz. (1200 cycles per minute) to determine what effect these environments had on crack growth rates, delta a/delta n (inches per cycle), of 5086-H34 aluminum when plotted against stress intensity range, delta K (Ksi root of in). Crack growth rates of 10^-8 inches per cycle were obtained which indicated that apparent threshold stress intensities, delta K th, exist which are the same for air, sea water and a constant potential of -1.0V(SCE); however, under a constant potential of -1.3V(SCE) the threshold shifts to a significantly higher value. It was also observed that the different enviroments had a pronounced effect on crack growth rate only at low stress intensities. Several mechanisms are considered to explain this behavior.
Identifier: 13859 (digitool), FADT13859 (IID), fau:10687 (fedora)
Collection: FAU Electronic Theses and Dissertations Collection
Note(s): College of Engineering and Computer Science
Thesis (M.S.E.)--Florida Atlantic University, 1977.
Subject(s): Aluminum--Testing
Aluminum--Fatigue
Held by: Florida Atlantic University Libraries
Persistent Link to This Record: http://purl.flvc.org/fcla/dt/13859
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.