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Mechanical modelling of surface scratching
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
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: urn:nbn:se:kth:diva-4885OAI: oai:DiVA.org:kth-4885DiVA: diva2:1764
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
List of papers
1. On the numerics and correlation of scratch testing
Open this publication in new window or tab >>On the numerics and correlation of scratch testing
2007 (English)In: Journal of Mechanics of Materials and Structures, ISSN 1559-3959, Vol. 2, no 3, 573-594 p.Article in journal (Refereed) Published
Abstract [en]

A numerical strategy based on the finite element method and intended for an accurate analysis of the scratch test is presented. For simplicity, but not out of necessity, the material was described by classical von Mises elastoplasticity utilizing large deformation theory. Based on this strategy numerous results are presented and correlation of scratch properties is discussed within the framework of theory for indentation testing. Furthermore, the existence of a representative plastic strain in the spirit of Tabor was studied. The investigation also concerns details regarding frictional effects, normal vs. tangential scratch hardness, similarities and differences between indentation and scratch test characteristics as well as details regarding the behavior of local field variables at scratching.

Keyword
scratch test, hardness, friction, finite elements, contact
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-24678 (URN)10.2140/jomms.2007.2.573 (DOI)000256269400009 ()2-s2.0-34548553158 (Scopus ID)
Note
QC 20100922Available from: 2010-09-22 Created: 2010-09-22 Last updated: 2010-11-24Bibliographically approved
2. Scratch testing of metals and polymers: Experiments and numerics
Open this publication in new window or tab >>Scratch testing of metals and polymers: Experiments and numerics
2009 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 266, no 1-2, 76-83 p.Article in journal (Refereed) Published
Abstract [en]

An experimental and numerical study of the scratch test performed on metals and polymers was conducted. The materials tested, being both metallic and polymeric, were related to the well known Johnson's parameter, often used to correlate indentation experiments. The aim was to determine whether it was possible to use the numerical approach presented by Wredenberg and Larsson [F. Wredenberg, P.-L Larsson, On the numerics and correlation of scratch testing, journal of Mechanics of Materials and Structures 2 (2006) 573-594] to describe the scratch mechanism and of course also to investigate whether or not important scratch quantities can be determined with sufficient accuracy from standard scratch experiments.

Keyword
Scratch test experiments, Finite element analysis, Contact, Metals, Polymers, 3-dimensional finite-element, sensitive hard metals, pyramid, indentation, mechanical analysis, deformations, ceramics, indenter, surface, cones
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-18040 (URN)10.1016/j.wear.2008.05.014 (DOI)000261538800010 ()2-s2.0-55249124755 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
3. On indentation and scratching of thin films on hard substrates
Open this publication in new window or tab >>On indentation and scratching of thin films on hard substrates
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.

Keyword
Elastoplasticity, Finite element method, Geometry, Indentation, Numerical methods, Substrates, Global indentation, Hard substrates, Scratching hardness
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-24680 (URN)10.1088/0022-3727/41/7/074022 (DOI)000254173700023 ()2-s2.0-41149123222 (Scopus ID)
Note
QC 20100922Available from: 2010-09-22 Created: 2010-09-22 Last updated: 2017-12-12Bibliographically approved
4. Delamination of thin coatings at scratching: Experiments and numerics
Open this publication in new window or tab >>Delamination of thin coatings at scratching: Experiments and numerics
2009 (English)In: Journal of Mechanics of Materials and Structures, ISSN 1559-3959, Vol. 4, no 6, 1041-1062 p.Article in journal (Refereed) Published
Abstract [en]

Scratching of thin coatings on hard substrates is studied experimentally and numerically, in the latter case by use of the finite element method. In particular the delamination behaviour at scratching, by increasing the normal load up to failure, is of interest. The adhesion of the coating to the substrate is modelled as a cohesive zone where relevant model parameters are determined experimentally using the double cantilever beam test with uneven bending moments (DCB-UBM). Good correlation between experimental and numerical results were achieved and the most important finding confirms the fact that the delamination behaviour was very much dependent on the critical energy release rate of the film/substrate interface. The results achieved are directly relevant for thin film polymer coatings but can also be applied in more general situations as a comprehensive parameter study is performed using the finite element method.

Keyword
scratching, finite element analysis, contact, delamination, cohesive, zone, adhesion, thin film, 3-dimensional finite-element, indentation, polymers, adhesion, stress, surface, growth, yield, deformation, simulations
Identifiers
urn:nbn:se:kth:diva-18861 (URN)10.2140/jomms.2009.4.1041 (DOI)000270727800004 ()2-s2.0-75949125473 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-01-17Bibliographically approved

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