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A fracture mechanics model to study indentation cutting

Terzano, M.; Spagnoli, A. and Ståhle, P. LU (2018) In Fatigue and Fracture of Engineering Materials and Structures
Abstract

Many cutting processes, such as chopping, slicing, and carving, consist in 2 different stages: an initial stage of indentation, in which the cutting tool is pushed into the material under the action of an external force, and a second stage, where the target material undergoes a progressive separation. This second stage is characterised by the formation of a fracture surface followed by the cut propagation due to the increasing external force, until eventually a steady state might occur. The purpose of this paper is to analyse the cutting process by means of some concepts of fracture mechanics and discuss the occurrence of the steady state. A simple model is used to obtain an analytic expression of the stress intensity factor at the tip... (More)

Many cutting processes, such as chopping, slicing, and carving, consist in 2 different stages: an initial stage of indentation, in which the cutting tool is pushed into the material under the action of an external force, and a second stage, where the target material undergoes a progressive separation. This second stage is characterised by the formation of a fracture surface followed by the cut propagation due to the increasing external force, until eventually a steady state might occur. The purpose of this paper is to analyse the cutting process by means of some concepts of fracture mechanics and discuss the occurrence of the steady state. A simple model is used to obtain an analytic expression of the stress intensity factor at the tip of the cut and investigate the evolution of the fracture process. It is found that the cut propagation depends on the wedge sharpness. The analytic results are compared with finite element analyses, where the effect of tip blunting due to plasticity is taken into account. The influence of the cutting tool geometry is also discussed.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Crack tip plasticity, Cutting, Fracture mechanics, Sharpness
in
Fatigue and Fracture of Engineering Materials and Structures
publisher
Wiley-Blackwell
external identifiers
  • scopus:85041192525
ISSN
8756-758X
DOI
language
English
LU publication?
yes
id
70a04da4-276a-4476-ac0e-63131e8a8fcc
date added to LUP
2018-02-12 13:01:08
date last changed
2018-05-29 11:01:27
@article{70a04da4-276a-4476-ac0e-63131e8a8fcc,
  abstract     = {<p>Many cutting processes, such as chopping, slicing, and carving, consist in 2 different stages: an initial stage of indentation, in which the cutting tool is pushed into the material under the action of an external force, and a second stage, where the target material undergoes a progressive separation. This second stage is characterised by the formation of a fracture surface followed by the cut propagation due to the increasing external force, until eventually a steady state might occur. The purpose of this paper is to analyse the cutting process by means of some concepts of fracture mechanics and discuss the occurrence of the steady state. A simple model is used to obtain an analytic expression of the stress intensity factor at the tip of the cut and investigate the evolution of the fracture process. It is found that the cut propagation depends on the wedge sharpness. The analytic results are compared with finite element analyses, where the effect of tip blunting due to plasticity is taken into account. The influence of the cutting tool geometry is also discussed.</p>},
  author       = {Terzano, M. and Spagnoli, A. and Ståhle, P.},
  issn         = {8756-758X},
  keyword      = {Crack tip plasticity,Cutting,Fracture mechanics,Sharpness},
  language     = {eng},
  month        = {02},
  publisher    = {Wiley-Blackwell},
  series       = {Fatigue and Fracture of Engineering Materials and Structures},
  title        = {A fracture mechanics model to study indentation cutting},
  url          = {http://dx.doi.org/},
  year         = {2018},
}