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Spontaneous fracture of growing precipitates with large misfit strain

Ståhle, Per LU ; Singh, R. N. and Banerjee, S. (2010) 2nd Broberg Memorial Symposium 2009 In International Journal of Fracture 165(2). p.189-197
Abstract
Precipitates that form as a result of phase transformation are studied with regard to mechanical behaviour and initiation of internal cracks. The focus is on precipitates occupying a larger volume than the surrounding matrix. Further the study is restricted to precipitates growing by incorporating material transformed from being matrix material to the phase of the precipitate. The phase transformation is here treated as a simple homogeneous swelling. The classical solutions for expanding inclusions predict that the inclusion becomes subjected to a constant homogeneous hydrostatic compression. During the process analysed here, added transformed material progressively relieve the compressive stress in the interior of the precipitate. As the... (More)
Precipitates that form as a result of phase transformation are studied with regard to mechanical behaviour and initiation of internal cracks. The focus is on precipitates occupying a larger volume than the surrounding matrix. Further the study is restricted to precipitates growing by incorporating material transformed from being matrix material to the phase of the precipitate. The phase transformation is here treated as a simple homogeneous swelling. The classical solutions for expanding inclusions predict that the inclusion becomes subjected to a constant homogeneous hydrostatic compression. During the process analysed here, added transformed material progressively relieve the compressive stress in the interior of the precipitate. As the process continues the stresses change from compression to tension in both radial and tangential directions in the centre of the precipitate. Further, growth of cracks in precipitates with poor fracture mechanical properties are studied. To simplify the analysis it is assumed that the fracture toughness is insignificant. The prediction is that around a third of the precipitate will fracture. The presence of a crack only has an insignificant effect on the load exerted by the swelling precipitate on the matrix. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Expanding precipitates, Misfit strain, Elastic-plastic, Fracture
in
International Journal of Fracture
volume
165
issue
2
pages
189 - 197
publisher
Springer
conference name
2nd Broberg Memorial Symposium 2009
external identifiers
  • wos:000281680600006
  • scopus:77956392100
ISSN
0376-9429
1573-2673
DOI
10.1007/s10704-010-9489-2
language
English
LU publication?
yes
id
51488496-7a58-40f9-a641-4d4becc4da93 (old id 1697418)
date added to LUP
2010-10-25 10:16:05
date last changed
2018-05-29 11:59:16
@inproceedings{51488496-7a58-40f9-a641-4d4becc4da93,
  abstract     = {Precipitates that form as a result of phase transformation are studied with regard to mechanical behaviour and initiation of internal cracks. The focus is on precipitates occupying a larger volume than the surrounding matrix. Further the study is restricted to precipitates growing by incorporating material transformed from being matrix material to the phase of the precipitate. The phase transformation is here treated as a simple homogeneous swelling. The classical solutions for expanding inclusions predict that the inclusion becomes subjected to a constant homogeneous hydrostatic compression. During the process analysed here, added transformed material progressively relieve the compressive stress in the interior of the precipitate. As the process continues the stresses change from compression to tension in both radial and tangential directions in the centre of the precipitate. Further, growth of cracks in precipitates with poor fracture mechanical properties are studied. To simplify the analysis it is assumed that the fracture toughness is insignificant. The prediction is that around a third of the precipitate will fracture. The presence of a crack only has an insignificant effect on the load exerted by the swelling precipitate on the matrix.},
  author       = {Ståhle, Per and Singh, R. N. and Banerjee, S.},
  booktitle    = {International Journal of Fracture},
  issn         = {0376-9429},
  keyword      = {Expanding precipitates,Misfit strain,Elastic-plastic,Fracture},
  language     = {eng},
  number       = {2},
  pages        = {189--197},
  publisher    = {Springer},
  title        = {Spontaneous fracture of growing precipitates with large misfit strain},
  url          = {http://dx.doi.org/10.1007/s10704-010-9489-2},
  volume       = {165},
  year         = {2010},
}