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In situ scanning electron microscopy study of fatigue crack propagation

Jacobsson, Lars LU ; Persson, Christer LU and Melin, Solveig LU (2008) In Strength of Materials 40(1). p.146-149
Abstract
The fatigue crack propagation rate is influenced by various mechanisms at the very vicinity of the crack tip, e.g., local plasticity and/or creep, microcracking, crack branching, and crack closure induced by plasticity and roughness. To study these mechanisms and their influence on crack propagation rate during different loadings, in situ scanning electron microscope studies have been performed. Throughout the load cycles images were taken and analyzed with an image analysis technique to measure the displacements around the crack tip. The obtained data can be used to determine compliance curves at any point along the crack, crack shapes, and the displacement field in the crack tip vicinity. The technique has been used to analyze which... (More)
The fatigue crack propagation rate is influenced by various mechanisms at the very vicinity of the crack tip, e.g., local plasticity and/or creep, microcracking, crack branching, and crack closure induced by plasticity and roughness. To study these mechanisms and their influence on crack propagation rate during different loadings, in situ scanning electron microscope studies have been performed. Throughout the load cycles images were taken and analyzed with an image analysis technique to measure the displacements around the crack tip. The obtained data can be used to determine compliance curves at any point along the crack, crack shapes, and the displacement field in the crack tip vicinity. The technique has been used to analyze which mechanisms of crack propagation are realized during, e.g., fatigue with overloads, and thermomechanical fatigue. The results were compared with results from measurements using the direct current potential drop technique, and it was found that various load conditions promote different mechanisms for crack propagation (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
potential drop, crack closure, fatigue, scanning electron microscope, crack propagation, crack shape
in
Strength of Materials
volume
40
issue
1
pages
146 - 149
publisher
Springer
external identifiers
  • wos:000262960300038
  • scopus:40749112700
ISSN
0039-2316
DOI
10.1007/s11223-008-0038-4
language
English
LU publication?
yes
id
c7f9816b-a82e-4499-9cea-abab7782f1da (old id 1047254)
date added to LUP
2008-03-11 14:07:15
date last changed
2017-01-01 06:16:24
@article{c7f9816b-a82e-4499-9cea-abab7782f1da,
  abstract     = {The fatigue crack propagation rate is influenced by various mechanisms at the very vicinity of the crack tip, e.g., local plasticity and/or creep, microcracking, crack branching, and crack closure induced by plasticity and roughness. To study these mechanisms and their influence on crack propagation rate during different loadings, in situ scanning electron microscope studies have been performed. Throughout the load cycles images were taken and analyzed with an image analysis technique to measure the displacements around the crack tip. The obtained data can be used to determine compliance curves at any point along the crack, crack shapes, and the displacement field in the crack tip vicinity. The technique has been used to analyze which mechanisms of crack propagation are realized during, e.g., fatigue with overloads, and thermomechanical fatigue. The results were compared with results from measurements using the direct current potential drop technique, and it was found that various load conditions promote different mechanisms for crack propagation},
  author       = {Jacobsson, Lars and Persson, Christer and Melin, Solveig},
  issn         = {0039-2316},
  keyword      = {potential drop,crack closure,fatigue,scanning electron microscope,crack propagation,crack shape},
  language     = {eng},
  number       = {1},
  pages        = {146--149},
  publisher    = {Springer},
  series       = {Strength of Materials},
  title        = {In situ scanning electron microscopy study of fatigue crack propagation},
  url          = {http://dx.doi.org/10.1007/s11223-008-0038-4},
  volume       = {40},
  year         = {2008},
}