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EDXRD analysis of stress corrosion cracking in 4140 steel

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TitleInfo
Title
EDXRD analysis of stress corrosion cracking in 4140 steel
Name (type = personal)
NamePart (type = family)
Berke
NamePart (type = given)
Brandon Seth
NamePart (type = date)
1983-
DisplayForm
Brandon Berke
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Tsakalakos
NamePart (type = given)
Thomas
DisplayForm
Thomas Tsakalakos
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
chair
Name (type = personal)
NamePart (type = family)
Akdogan
NamePart (type = given)
Enver Koray
DisplayForm
Enver Koray Akdogan
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Khachaturyan
NamePart (type = given)
Armen
DisplayForm
Armen Khachaturyan
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Al-Sharab
NamePart (type = given)
Jafar F
DisplayForm
Jafar F Al-Sharab
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
outside member
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
Graduate School - New Brunswick
Role
RoleTerm (authority = RULIB)
school
TypeOfResource
Text
Genre (authority = marcgt)
theses
OriginInfo
DateCreated (qualifier = exact)
2012
DateOther (qualifier = exact); (type = degree)
2012-10
Place
PlaceTerm (type = code)
xx
Language
LanguageTerm (authority = ISO639-2b); (type = code)
eng
Abstract (type = abstract)
The analysis of the strains around the immediate vicinity of a crack tip to encompass the plastic zone in 4140 steel specimens was undertaken. Each specimen was subjected to a cyclic loading in air with a KI of 24.2 MPa√m to generate a fatigue crack around 5.7mm. After a mechanical overload corresponding to a KImax of 38.5 MPa√m in varying environments (Air, 3.5% NaCl solution simulating sea water and zinc couple to the 3.5% NaCl solution for generating hydrogen) ranging from inert up to a stress corrosion cracking (SCC) environment were carried out. During the overloading process only the specimens in an SCC environment were subjected to crack activity as expected. For this reason method that hydrogen attacks steel (hydrogen embrittlement) was a point of curiosity as well. Three SCC specimens were prepared to stay within different phases: i) no crack growth, ii) onset of crack growth and iii) crack growth of ~1mm. Two of the specimens (Air and SCC with the onset of crack growth) were measured by mapping up to all three 3D principle elastic strains (PES) using a polychromatic high energy synchrotron x-ray probe with photon energies up to 200 keV in the Laue mode. The PES ε11 and ε22 were directly measured, iii while the PES ε33 was obtained from the combined measurement of ε22 and ε23 of the elastic strain matrix. By using the generalized Hooke’s law and the von Mises yield criterion for 3D state of stresses in conjunction with the measured PES, maps of the von Mises equivalent stress (σeq) were obtained. In addition, of the air specimen, the principle plastic strains and total strains were calculated and used to show the principle stress fields and equivalent stress field. The results indicated that the PES in the direction orthogonal to the crack path i.e. the ε22 is sufficient for measuring the plastic zone in 4140 steel. The use of three models (Linear Elastic Fracture Mechanics (LEFM), Hutchinson- Rice-Rosengren (HRR) and a blunted crack tip) to define the border of the plastic zone was employed. These three models were overlaid on the ε22 strain maps. The juxtaposition of the models with the data showed some varying agreement with the projected plastic zone size. The models helped estimate that SCC causes the plastic zone to grow when an SCC crack occurs, due to a lowering of the yield strength of the material and decreases it ductility.
Subject (authority = RUETD)
Topic
Materials Science and Engineering
Subject (authority = ETD-LCSH)
Topic
Steel--Stress corrosion
Subject (authority = ETD-LCSH)
Topic
Diffractive scattering
Subject (authority = ETD-LCSH)
Topic
X-rays--Diffraction
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Identifier
ETD_4169
Identifier (type = hdl)
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000066613
Identifier (type = doi)
doi:10.7282/T3KH0M3B
PhysicalDescription
Form (authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
xiii, 62 p. : ill.
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Brandon Seth Berke
Location
PhysicalLocation (authority = marcorg); (displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

RightsDeclaration (ID = rulibRdec0006)
The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Berke
GivenName
Brandon
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2012-07-06 11:48:23
AssociatedEntity
Name
Brandon Berke
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
AssociatedObject
Type
License
Name
Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
RightsEvent
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2012-10-31
DateTime (encoding = w3cdtf); (qualifier = exact); (point = end)
2013-10-31
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after October 31st, 2013.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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