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The fracture mechanics in cutting : A comparative study on hard and soft polymeric materials

Spagnoli, A.; Terzano, M.; Brighenti, R.; Artoni, F. and Ståhle, P. LU (2018) In International Journal of Mechanical Sciences 148. p.554-564
Abstract

An experimental campaign has been carried out with the aim of providing an insight into the fracture processes occurring during the cutting of different types of polymers, with features ranging from typically brittle to soft hyperelastic behaviour. The steady state of cutting is investigated using a sharp thin blade, and tracking the insertion force versus the penetration displacement. For soft, highly-deformable polymers, the influence of large deformations at the crack tip is also taken into account, through full-field finite strain maps obtained by means of digital image correlation. In brittle polymers, the influence of the cutting tool sharpness is discussed with respect to the onset of crack propagation, through a comparison with... (More)

An experimental campaign has been carried out with the aim of providing an insight into the fracture processes occurring during the cutting of different types of polymers, with features ranging from typically brittle to soft hyperelastic behaviour. The steady state of cutting is investigated using a sharp thin blade, and tracking the insertion force versus the penetration displacement. For soft, highly-deformable polymers, the influence of large deformations at the crack tip is also taken into account, through full-field finite strain maps obtained by means of digital image correlation. In brittle polymers, the influence of the cutting tool sharpness is discussed with respect to the onset of crack propagation, through a comparison with a simplified analytical model, and numerical finite element analyses. The results suggest that the propagation of the cut clearly depends on the tool sharpness, and for a class of brittle polymers it appears that this may happen as a stable fracture process, with the distance between the blade and the crack tip remaining constant during propagation. On the contrary, soft polymers appear to be much less sensible to the tool profile, and it is the large deformation that ultimately determines the fracture behaviour when the crack tip is reached by the blade.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Blade sharpness, Cutting, Fracture toughness, Glassy polymers, Large deformations, Soft materials
in
International Journal of Mechanical Sciences
volume
148
pages
11 pages
publisher
Elsevier
external identifiers
  • scopus:85053770048
ISSN
0020-7403
DOI
10.1016/j.ijmecsci.2018.09.013
language
English
LU publication?
yes
id
036a748c-75de-4e6c-93e0-811c905908d3
date added to LUP
2018-10-09 08:43:10
date last changed
2019-03-17 05:09:14
@article{036a748c-75de-4e6c-93e0-811c905908d3,
  abstract     = {<p>An experimental campaign has been carried out with the aim of providing an insight into the fracture processes occurring during the cutting of different types of polymers, with features ranging from typically brittle to soft hyperelastic behaviour. The steady state of cutting is investigated using a sharp thin blade, and tracking the insertion force versus the penetration displacement. For soft, highly-deformable polymers, the influence of large deformations at the crack tip is also taken into account, through full-field finite strain maps obtained by means of digital image correlation. In brittle polymers, the influence of the cutting tool sharpness is discussed with respect to the onset of crack propagation, through a comparison with a simplified analytical model, and numerical finite element analyses. The results suggest that the propagation of the cut clearly depends on the tool sharpness, and for a class of brittle polymers it appears that this may happen as a stable fracture process, with the distance between the blade and the crack tip remaining constant during propagation. On the contrary, soft polymers appear to be much less sensible to the tool profile, and it is the large deformation that ultimately determines the fracture behaviour when the crack tip is reached by the blade.</p>},
  author       = {Spagnoli, A. and Terzano, M. and Brighenti, R. and Artoni, F. and Ståhle, P.},
  issn         = {0020-7403},
  keyword      = {Blade sharpness,Cutting,Fracture toughness,Glassy polymers,Large deformations,Soft materials},
  language     = {eng},
  pages        = {554--564},
  publisher    = {Elsevier},
  series       = {International Journal of Mechanical Sciences},
  title        = {The fracture mechanics in cutting : A comparative study on hard and soft polymeric materials},
  url          = {http://dx.doi.org/10.1016/j.ijmecsci.2018.09.013},
  volume       = {148},
  year         = {2018},
}