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Kulachenko, Artem
Publications (10 of 18) Show all publications
Lindström, S., Kulachenko, A. & Uesaka, T. (2009). New insights in paper forming from particle-level process simulations. In: Papermaking Research Symposium 2009 (pp. 38). Kuopio, Finland: University of Kuopio
Open this publication in new window or tab >>New insights in paper forming from particle-level process simulations
2009 (English)In: Papermaking Research Symposium 2009, Kuopio, Finland: University of Kuopio , 2009, p. 38-Conference paper, Published paper (Other academic)
Abstract [en]

By virtue of the recent developments in simulation techniques for fibre suspensions flows, it is now possible to directly simulate forming of the paper sheet at a particle level under realistic flow conditions. This opens up a window of opportunity to better understand the microscale development of the paper structure, and to attribute particular features of the structure to different drainage elements.The simulations are based on a particle-level fibre suspension model, in which fibres are represented by chains of cylindrical fibre segments. The fibre model includes curled shapes and the torsion and bending of the fibres. It also captures the two-way interactions between the fibres and the fluid phase. The fluid motion is integrated from the Navier--Stokes equations.To illustrate the usage of the simulation tool, a sample parametric study of the effects of different fibre furnishes on the paper structure and wet strength is presented. Such an investigation could almost as easily have been performed with experiments. Simulations, however, have some advantages: First, the cost is almost nothing as compared to pilot trials. Secondly, the parameters of the simulations can be controlled one at a time, whereas in pilot trials, changing one process parameter will affect the others. Thirdly, every detail of the evolving paper structure is accessible at every instant in the simulations. That is, the forming process needs no longer be considered a "black box". Simulations also have some drawbacks. For instance, it is not possible to include the smallest particles, due to their vast number, while maintaining sufficiently large flow geometry. Therefore, simulations must target paper grades of low fines contents.In this communication, the pros and cons of particle-level simulations are discussed, and put into the context of previous forming and dewatering models in the literature. The development of the paper microstructure predicted in the simulations shows that thickening is the dominant forming mechanism, while filtration only occurs in the most dilute end of the typical range of consistencies used in the industry. This predicted behaviour is compared with the conventional view of dewatering, which holds filtration as the dominant forming mechanism.

 

Place, publisher, year, edition, pages
Kuopio, Finland: University of Kuopio, 2009
Keywords
Fiber suspension, Papermaking, Paper structure, Simulation
National Category
Forest Science
Identifiers
urn:nbn:se:miun:diva-9211 (URN)978-951-27-1016-4 (ISBN)
Projects
The forest as a resource
Available from: 2009-06-24 Created: 2009-06-24 Last updated: 2010-02-25Bibliographically approved
Kulachenko, A., Lindström, S. & Uesaka, T. (2009). Strength of wet fiber networks-Strength scaling. In: Papermaking Research Symposium 2009 (pp. 35). Kuopio: University of Kuopio
Open this publication in new window or tab >>Strength of wet fiber networks-Strength scaling
2009 (English)In: Papermaking Research Symposium 2009, Kuopio: University of Kuopio , 2009, p. 35-Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
Kuopio: University of Kuopio, 2009
Keywords
fiber network model, weak-link scaling
National Category
Forest Science
Identifiers
urn:nbn:se:miun:diva-9210 (URN)978-951-27-1016-4 (ISBN)
Projects
The forest as a resource
Available from: 2009-06-24 Created: 2009-06-24 Last updated: 2010-02-25Bibliographically approved
Kulachenko, A., Uesaka, T. & Lindström, S. (2008). Reinventing mechanics of fibre network. In: Progress in Paper Physics Seminar (pp. 185-193). Helsinki: Helsinki University Press
Open this publication in new window or tab >>Reinventing mechanics of fibre network
2008 (English)In: Progress in Paper Physics Seminar, Helsinki: Helsinki University Press, 2008, p. 185-193Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
Helsinki: Helsinki University Press, 2008
National Category
Chemical Engineering Other Engineering and Technologies
Identifiers
urn:nbn:se:miun:diva-6828 (URN)6030 (Local ID)6030 (Archive number)6030 (OAI)
Projects
Stochastic Modelling of Paper Structures
Available from: 2008-11-20 Created: 2008-11-02 Last updated: 2013-03-25Bibliographically approved
Kulachenko, A., Gradin, P. & Uesaka, T. (2007). Basic mechanisms of fluting formation and retention in paper. Mechanics of materials (Print), 39(7), 643-663
Open this publication in new window or tab >>Basic mechanisms of fluting formation and retention in paper
2007 (English)In: Mechanics of materials (Print), ISSN 0167-6636, E-ISSN 1872-7743, Vol. 39, no 7, p. 643-663Article in journal (Refereed) Published
Abstract [en]

Out-of-plane deformations of paper, such as fluting, significantly deteriorate the quality of a printed product. There are several explanations of fluting presented in the literature but there is no unanimously accepted theory regarding fluting formation and retention which is consistent with all field observations. This paper first reviews the existing theories and proposes a mechanism that might give an answer to most of the questions regarding fluting. The fluting formation has been considered as a post-buckling phenomenon which has been analysed with the help of the finite element method. Fluting retention has been modelled by introducing an ink layer over the paper surface with the ink stiffness estimated from experimental results. The impact of fast drying on fluting has been assessed numerically and experimentally. The result of the study suggests that fluting occurs due to small-scale hygro-strain variations, which in turn are caused by the moisture variations created during fast convection (through-air) drying. The result also showed that ink stiffening alone cannot explain the fluting amplitudes observed in practice, but that high drying temperatures promote inelastic (irreversible) deformations in paper and this may itself preserve fluting.

Keywords
Cockling, Fibre orientation, Fluting, Moisture variations
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:miun:diva-3922 (URN)10.1016/j.mechmat.2006.10.002 (DOI)000245478300003 ()2-s2.0-33847619798 (Scopus ID)4298 (Local ID)4298 (Archive number)4298 (OAI)
Available from: 2008-09-30 Created: 2009-06-08 Last updated: 2017-12-12Bibliographically approved
Torgnysdotter, A., Kulachenko, A., Gradin, P. & Wågberg, L. (2007). Fiber/Fiber crosses: Finite Element Modelling and Comparison with Experiment. Journal of composite materials, 41(13), 1603-1608
Open this publication in new window or tab >>Fiber/Fiber crosses: Finite Element Modelling and Comparison with Experiment
2007 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 41, no 13, p. 1603-1608Article in journal (Refereed) Published
Abstract [en]

Fibre/fibre joints were analysed using finite element analysis in order to characterise the influence of fibre and contact region properties on the stress strain behaviour of a single fibre/fibre cross. The output of the models was validated by comparison with experimental load deformation curves. The contact zone of the fibre/fibre joint was studied with respect to the appearance of the contact zone, the contact area, and the contact pattern; the work of adhesion of the contact areas was also considered. It was shown that the two-dimensional appearance of the contact zone had little influence on the stress strain behaviour of the fibre/fibre cross under tensile loading. The maximum stress and hence the fibre/fibre joint strength was, however, affected by the degree of contact. It was concluded that knowledge of the material behaviour of the contact zone (such as local plastic behaviour) and of chemical effects (such as work of adhesion) are needed to predict the fibre/fibre joint strength.

Keywords
Fibre/fibre cross, Bonded area, Bonding strength, Chemical bonds, Joints
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:miun:diva-5262 (URN)10.1177/0021998306069873 (DOI)000248687500004 ()2-s2.0-34347334461 (Scopus ID)4299 (Local ID)4299 (Archive number)4299 (OAI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2018-11-09Bibliographically approved
Kulachenko, A., Gradin, P. & Kuivurova, H. (2007). Modelling the dynamical behaviour of a paper web: Part I. Computers and Structures, 85(3-4), 131-147
Open this publication in new window or tab >>Modelling the dynamical behaviour of a paper web: Part I
2007 (English)In: Computers and Structures, ISSN 0045-7949, Vol. 85, no 3-4, p. 131-147Article in journal (Refereed) Published
Abstract [en]

A new shell element has been proposed for geometrically non-linear, finite element analyses of axially moving paper web. Web instability problems of paper travelling in a printing system, such as wrinkling and fluttering, pose special challenges in the numerical analyses. For examples, these are finite bending stiffness (as opposed to membrane), orthotropy, and non-uniform distributions of mechanical and hygro-properties (in different length scales). The new formulation has accounted for paper transport velocity and paper bending stiffness based on a mixed Lagrangian-Eulerian description of the motion. A natural coordinate system has been employed in the analytical and finite element formulations. Benchmarking with different finite elements in various tests showed that the proposed element is indeed more stable and reliable for the chosen application than existing elements. The usability of the shell element has been successfully demonstrated by two example problems: wrinkling of stretched isotropic and orthotropic membranes, and the vibration of a web showing a speed-tensioning effect above a critical web transport velocity.

Keywords
Axially moving materials, Hamilton's principle, One-point quadrature element, Physical hourglass control, Finit element analys
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:miun:diva-4730 (URN)10.1016/j.compstruc.2006.09.006 (DOI)000244511600002 ()2-s2.0-33846190183 (Scopus ID)2808 (Local ID)2808 (Archive number)2808 (OAI)
Note

VR-Engineering

Available from: 2008-09-30 Created: 2009-11-02 Last updated: 2016-09-30Bibliographically approved
Kulachenko, A., Gradin, P. & Kuivurova, H. (2007). Modelling the dynamical behaviour of a paper web: Part II. Computers and Structures, 85(3-4), 148-157
Open this publication in new window or tab >>Modelling the dynamical behaviour of a paper web: Part II
2007 (English)In: Computers and Structures, ISSN 0045-7949, Vol. 85, no 3-4, p. 148-157Article in journal (Refereed) Published
Abstract [en]

In this paper, a finite element procedure is used to study the dynamic behaviour of a paper web in a free span between two rollers, including effects of transport velocity and surrounding air. The paper web is modelled as a three-dimensional orthotropic structure. The influence of air is accounted for by utilizing fluid-solid interaction analyses based on acoustic theory. The contribution of transport velocity is included through gyroscopic matrices and forces. The structural response on harmonic excitations has been studied using linear and non-linear models. Results show that air significantly reduces eigenfrequencies of the web. So called "edge-flutter" is nothing but the result of skew tension profile. Excessive web vibration can be eliminated by adjusting the web tension.

Keywords
Finit element
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:miun:diva-4726 (URN)10.1016/j.compstruc.2006.09.007 (DOI)000244511600003 ()2-s2.0-33846235916 (Scopus ID)2806 (Local ID)2806 (Archive number)2806 (OAI)
Note

VR-Engineering

Available from: 2008-09-30 Created: 2009-11-02 Last updated: 2016-09-30Bibliographically approved
Kulachenko, A. & Uesaka, T. (2007). The Effects of Fibre Orientation Streaks on out-of-Plane Instability of Paper. In: Proceedings of the 2007 International Paper Physics Conference (pp. 255-260).
Open this publication in new window or tab >>The Effects of Fibre Orientation Streaks on out-of-Plane Instability of Paper
2007 (English)In: Proceedings of the 2007 International Paper Physics Conference, 2007, p. 255-260Conference paper, Published paper (Other scientific)
Keywords
fibre, paper, streaks, instability
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:miun:diva-4469 (URN)5496 (Local ID)5496 (Archive number)5496 (OAI)
Available from: 2008-09-30 Created: 2008-09-30Bibliographically approved
Torgnysdotter, A., Kulachenko, A., Gradin, P. & Wågberg, L. (2007). The Link Between the Fiber Contact Zone and the Physical Properties of Paper: A Way to Control Paper Properties. Journal of composite materials, 41(13), 1619-1633
Open this publication in new window or tab >>The Link Between the Fiber Contact Zone and the Physical Properties of Paper: A Way to Control Paper Properties
2007 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 41, no 13, p. 1619-1633Article in journal (Refereed) Published
Abstract [en]

In order to establish a link between the properties of the fibre surface and the paper performance under stress, the properties of single fibres and the properties of the joints between fibres were linked to the acoustic emission behaviour of paper of surface treated regenerated cellulose fibres under stress. Results show that the strength of the single fibre joint was influenced by the surfaces properties of the fibres and the interactions in the contact zone during joint formation, which in turn were dependent on both chemical and mechanical properties of the fibres surface. As the paper properties in this case were independent of the mechanical properties of the fibres, there was a strong link between the properties of the fibre-surface and joint properties and the behaviour of the paper under stress.

Keywords
Bonds, Bonding strength, Bonded area, Fibre bonding, Chemical bonding, joints, dry strength, swelling
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-1107 (URN)10.1177/0021998306069875 (DOI)000248687500005 ()2-s2.0-34347351149 (Scopus ID)4300 (Local ID)4300 (Archive number)4300 (OAI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2018-11-09Bibliographically approved
Kulachenko, A., Gradin, P. A. & Uesaka, T. (2006). Basic mechanisms of fluting. In: 92nd Annual Meeting Preprints-Book A, 7 Feb. 2006 , Canada: (pp. 161-173). Que., Canada: Pulp and Paper Technical Association of Canada
Open this publication in new window or tab >>Basic mechanisms of fluting
2006 (English)In: 92nd Annual Meeting Preprints-Book A, 7 Feb. 2006 , Canada, Que., Canada: Pulp and Paper Technical Association of Canada , 2006, p. 161-173Conference paper, Published paper (Refereed)
Abstract [en]

Out-of-plane deformations of paper, such as fluting, significantly deteriorate the quality of a printed product. There are several explanations of fluting presented in the literature but there is no unanimously accepted theory regarding fluting formation consistent with all field observations. The present paper reviews the existing theories and proposes a mechanism that might give an answer to most of the questions regarding the fluting. The fluting formation has been considered as a post-buckling phenomenon which is analysed with the help of the finite element method. Fluting retention has been modelled by introducing an ink layer over the paper surface with ink stiffness estimated from experimental results. The impact of fast drying on fluting has been assessed numerically and experimentally. The result of the study suggests that fluting occurs due to small-scale strain variations, which in turn are caused by the moisture variations created during fast convection drying. The result also showed that ink stiffening alone cannot explain the fluting amplitudes observed in practice, suggesting the presence of other mechanisms of fluting retention.

Place, publisher, year, edition, pages
Que., Canada: Pulp and Paper Technical Association of Canada, 2006
Keywords
Fluting, FEA, Heatset Web Offset Printing
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:miun:diva-3427 (URN)3421 (Local ID)1 897023 17 0 (ISBN)3421 (Archive number)3421 (OAI)
Available from: 2008-09-30 Created: 2009-06-08Bibliographically approved
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