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In situ scanning electron microscopy study of fatigue crack propagation

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Author

Summary, in English

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

Publishing year

2008

Language

English

Pages

146-149

Publication/Series

Strength of Materials

Volume

40

Issue

1

Document type

Journal article

Publisher

Springer

Topic

  • Materials Engineering
  • Applied Mechanics

Keywords

  • potential drop
  • crack closure
  • fatigue
  • scanning electron microscope
  • crack propagation
  • crack shape

Status

Published

ISBN/ISSN/Other

  • ISSN: 0039-2316