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On indentation and scratching of thin films on hard substrates
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0001-6232-8819
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2008 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 41, no 7, 074022- p.Article in journal (Refereed) Published
Abstract [en]

Indentation and scratching of thin film/substrate structures, using sharp conical indenters, are studied theoretically and numerically and discussed in particular with material characterization in mind. For simplicity, but not out of necessity, the material behaviour is described by classical elastoplasticity accounting for large deformations. Explicit material parameters are chosen in order to arrive at representative results as regards material behaviour and indenter geometry. The main efforts are devoted towards an understanding of the influence from the film/substrate boundary on global indentation (scratching) properties at different material combinations. Global quantities to be investigated include indentation and scratching hardness, contact area and apparent coefficient of friction at scratching. A comparison of the mechanical behaviour at normal indentation and at scratching is also included. In addition, the behaviour of different field variables is studied and in this case the discussion is focused on fracture initiation governed by a critical stress criterion. The numerical investigation is performed using the finite element method and the numerical strategy is discussed in some detail. Throughout the analysis it is assumed that the substrate is considerably harder than the indented film and consequently the deformation of the substrate is neglected.

Place, publisher, year, edition, pages
2008. Vol. 41, no 7, 074022- p.
Keyword [en]
Elastoplasticity, Finite element method, Geometry, Indentation, Numerical methods, Substrates, Global indentation, Hard substrates, Scratching hardness
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-24680DOI: 10.1088/0022-3727/41/7/074022ISI: 000254173700023Scopus ID: 2-s2.0-41149123222OAI: oai:DiVA.org:kth-24680DiVA: diva2:352682
Note
QC 20100922Available from: 2010-09-22 Created: 2010-09-22 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Mechanical modelling of surface scratching
Open this publication in new window or tab >>Mechanical modelling of surface scratching
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2008. 23 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid mechanics, ISSN 1654-1472 ; 0455
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-4885 (URN)
Public defence
2008-09-19, Sal B2, KTH, Brinnellvägen 23, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

QC 20100922

Available from: 2008-09-16 Created: 2008-09-16 Last updated: 2013-01-14Bibliographically approved

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Larsson, Per-Lennart

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