miun.sePublikasjoner
Endre søk
Begrens søket
1 - 18 of 18
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Isaksson, Per
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per A
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Kulachenko, Artem
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Acoustic Emission applied to mechanically loaded Paper ??Manuskript (Annet vitenskapelig)
  • 2.
    Isaksson, Per
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Kulachenko, Artem
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per A
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    The onset and progression of damage in isotropic paper sheets2006Inngår i: International Journal of Solids and Structures, ISSN 0020-7683, Vol. 43, nr 3-4, s. 713-726Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The validity of existing criteria and relations for the onset and evolution of damage in paper is investigated and it is found that a non - local theory has to be utilized.

  • 3.
    Kulachenko, Artem
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Printing Press Paper Web Mechanics2004Licentiatavhandling, med artikler (Annet vitenskapelig)
  • 4.
    Kulachenko, Artem
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per A
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Uesaka, Tetsu
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
    Basic mechanisms of fluting2006Inngår i: 92nd Annual Meeting Preprints-Book A, 7 Feb. 2006 , Canada, Que., Canada: Pulp and Paper Technical Association of Canada , 2006, s. 161-173Konferansepaper (Fagfellevurdert)
    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.

  • 5.
    Kulachenko, Artem
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per A
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
    Uesaka, Tetsu
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
    Basic mechanisms of fluting formation and retention in paper2006Rapport (Annet vitenskapelig)
  • 6.
    Kulachenko, Artem
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per A
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Westerlind, B
    Analysis of Paper Web Tension Profiles2005Inngår i: Journal of Graphic Technology, ISSN 1544-9599, E-ISSN 1544-9602, nr 2, s. 72-81Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The tension profiles of paper webs are very important for determining the runnability in printing presses. Uneven tension profiles, with lower web tension toward the edges, develop in the paper machine due to many factors such as moisture content, residual strains related to drying and draw conditions, fibre orientation etc. This study presents some simple relations regarding the initial strain distribution, but also a method for adjusting the tension profile by choosing an appropriate moisture distribution. The method is verified on web tension and moisture measurements in a pressroom.

  • 7.
    Kulachenko, Artem
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Kuivurova, H.
    University of Oulu, Finland.
    Modelling the dynamical behaviour of a paper web: Part I2007Inngår i: Computers and Structures, ISSN 0045-7949, Vol. 85, nr 3-4, s. 131-147Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 8.
    Kulachenko, Artem
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Kuivurova, H.
    University of Oulu, Finland.
    Modelling the dynamical behaviour of a paper web: Part II2007Inngår i: Computers and Structures, ISSN 0045-7949, Vol. 85, nr 3-4, s. 148-157Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 9.
    Kulachenko, Artem
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Uesaka, Tetsu
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
    Basic mechanisms of fluting formation and retention in paper2007Inngår i: Mechanics of materials (Print), ISSN 0167-6636, E-ISSN 1872-7743, Vol. 39, nr 7, s. 643-663Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 10.
    Kulachenko, Artem
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Uesaka, Tetsu
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
    Tension wrinkling and fluting in heatset web offset printing process: post buckling analysis2005Inngår i: Advances in Paper Science and Technology: Transactions of the 13th fundamental research symposium, Vols 1-3, 2005, s. 1075-1099Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Geometrically non-linear, large scale post-buckling analyses were carried out to investigate the influence of different parameters on residual waviness (fluting) after printing in a heat set web offset printing press. Mixed implicit-explicit finite element techniques were used in the analyses. The numerical procedure was verified by experimentally acquired data. Results show that when the paper web is perfectly flat before printing, fluting patterns after drying and moisture recovery generally have higher wavelength than those typically observed in fluted samples. Initial cockles of imprinted sheets were found to have impacts on the fluting patterns and amplitudes. Among the factors investigated, ink thickness and hygroexpansivity had significant influences on fluting: increasing these factors increased fluting amplitudes.

  • 11.
    Kulachenko, Artem
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Uesaka, Tetsu
    The effect of local moisture variations on fluting in heatset web offset printing2005Inngår i: Proc. of 5th Biennial Johan Gullichsen Colloquium, 2005Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The effect of micro scale variations on fluting formation has been studied by using quasi-static post-buckling analyses. The analyses are based on implicit time integration techniques and incorporated the ink stiffening effect during drying in the heatset oven. A series of parametric studies have been conducted to investigate effects of bending stiffness, ink thickness, tension, and scale of moisture variations. Experiments were also performed to estimate the ink layer stiffness after drying and to investigate the retention of flutes after printing. The results showed that, in order to explain the occurrence of flutes in the wavelength of 1-2 cm, micro-scale strain variations are necessary. Such variations are most likely caused by the local moisture variations and the subsequent plastic deformation of paper due to heating. Ink stiffening alone was found to be insufficient to retain the fluting shapes after drying.

  • 12.
    Kulachenko, Artem
    et al.
    KCL Science and Consulting.
    Lindström, Stefan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap, teknik och matematik.
    Uesaka, Tetsu
    FPInnovations.
    Strength of wet fiber networks-Strength scaling2009Inngår i: Papermaking Research Symposium 2009, Kuopio: University of Kuopio , 2009, s. 35-Konferansepaper (Annet vitenskapelig)
  • 13.
    Kulachenko, Artem
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Uesaka, Tetsu
    Institutionen för naturvetenskap.
    The Effects of Fibre Orientation Streaks on out-of-Plane Instability of Paper2007Inngår i: Proceedings of the 2007 International Paper Physics Conference, 2007, s. 255-260Konferansepaper (Annet vitenskapelig)
  • 14.
    Kulachenko, Artem
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap, teknik och matematik.
    Uesaka, Tetsu
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap, teknik och matematik.
    Lindström, Stefan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap, teknik och matematik.
    Reinventing mechanics of fibre network2008Inngår i: Progress in Paper Physics Seminar, Helsinki: Helsinki University Press, 2008, s. 185-193Konferansepaper (Annet vitenskapelig)
  • 15.
    Lindström, Stefan
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap, teknik och matematik.
    Kulachenko, Artem
    KCL Science and Consulting.
    Uesaka, Tetsu
    FPInnovations.
    New insights in paper forming from particle-level process simulations2009Inngår i: Papermaking Research Symposium 2009, Kuopio, Finland: University of Kuopio , 2009, s. 38-Konferansepaper (Annet vitenskapelig)
    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.

     

  • 16.
    Torgnysdotter, Annsofie
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
    Kulachenko, Artem
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Wågberg, Lars
    KTH.
    Fiber/Fiber crosses: Finite Element Modelling and Comparison with Experiment2007Inngår i: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 41, nr 13, s. 1603-1608Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 17.
    Torgnysdotter, Annsofie
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
    Kulachenko, Artem
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Wågberg, Lars
    KTH.
    The Link Between the Fiber Contact Zone and the Physical Properties of Paper: A Way to Control Paper Properties2007Inngår i: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 41, nr 13, s. 1619-1633Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 18.
    Torgnysdotter, AnnSofie
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
    Kulachenko, Artem
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Gradin, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Wågberg, P
    Modification of the Contact Zone to Control the Physical Behaviour of Paper - A Model Experiment: Pappersfysik konferens i Trondheim ?2004Konferansepaper (Annet vitenskapelig)
    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.

1 - 18 of 18
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf