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Quasi static analysis of creasing and folding for three paperboards
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2013 (English)Report (Other academic)
Abstract [en]

The creasing and folding behavior of three paperboards have been studied both experimentally and numerically. Creasing and folding studies were performed on strips in both the machine direction and the cross machine direction. A finite element model that mimicked the experimental creasing and folding setup was developed, and the creasing and folding behavior could be well predicted for all three paperboards.

An experimental characterization scheme consisting of three experiments was proposed, and was shown to be sufficient to predict the creasing and folding behavior. For the whole paperboard the shear strength profiles in the through thickness direction was determined with the notched shear test. Each ply was laid free by grinding, and density measurements and in-plane tension tests were performed on the bottom, middle and top plies of each paperboard. Instead of assuming uniform properties in each ply, the shear strength profiles were used to map the measured properties in the through thickness direction.

Numerical simulations were performed when the ply and interface properties of the paperboards were altered to follow different shear strength profiles. This was done in order to mimic different production strategies. It was shown that the interface strengths mainly influenced the folding behavior. Whereas altered the ply properties affected the creasing force needed.

Place, publisher, year, edition, pages
2013. , 34 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0537
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-125886OAI: oai:DiVA.org:kth-125886DiVA: diva2:641101
Note

QC 20130815

Available from: 2013-08-15 Created: 2013-08-15 Last updated: 2013-08-15Bibliographically approved
In thesis
1. Numerical and Experimental Investigation on Paperboard Converting Processes
Open this publication in new window or tab >>Numerical and Experimental Investigation on Paperboard Converting Processes
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

An investigation of the mechanical properties of paperboard and its influence on converting processessuch as creasing, folding and forming, from both an experimental and numerical perspective wasperformed. Fundamental research to establish a material model for paperboard, and an experimentalout-of-plane shear test method was suggested. Research where the models were used for verificationwas also done. The numerical model is a combination of continuum and interface models. Thecontinuum model represents the paperboard plies, which is an orthotropic elastic-plastic model withHill criteria and isotropic hardening. The interface model is used for connecting the paperboard pliesand also contributing to the delamination properties during converting processes. The interface modelhas linear elastic behavior followed by the initiation and evolution of damage. Both of these twomodels are available in ABAQUS. An experimental characterization scheme consisting of threeexperiments: in-plane tensile test, double notch shear test and density measurements, was shown to besufficient to predict the creasing and folding behavior.The creasing and folding performance can be well predicted by the model. The impact of ply andinterface properties on different paperboards were investigated by numerical simulations, in order tomimic different production strategies. It was shown that the interface strengths mainly influenced thefolding behavior, whereas different ply properties affected the required creasing force.The forming investigation was conducted in a three dimensions deep pear-shape mould. The numericalinvestigation included the effect of pressure, boundary conditions, material properties, differentdeformation and damage mechanisms, i.e. delamination and plasticity. The results showed thesimulation can capture the failure pattern of experiments and the mechanisms during forming. Toachieve better forming performance with anisotropic commercial paperboard in an axis-symmetricmould, a combination of fixed and free boundary conditions can be used to minimize in-plane straincomponents while enabling delamination. Modification of material properties would enable an evenbetter optimization. Additionally, reduction of anisotropy can improve the forming performance.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. 29 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0538
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-125883 (URN)
Public defence
2013-08-30, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20130815

Available from: 2013-08-15 Created: 2013-08-15 Last updated: 2013-08-16Bibliographically approved

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