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The Dependency of Shear Zone Length on the Shear Strength Profiles in Paperboard
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2012 (English)In: Experimental mechanics, ISSN 0014-4851, E-ISSN 1741-2765, Vol. 52, no 8, 1047-1055 p.Article in journal (Refereed) Published
Abstract [en]

In this work, the notched shear strength test (NST) has been further improved. In order to simplify and accelerate the testing procedure, the notches with declined slopes were used. With the proposed procedure, the shear strength profile in the thickness direction of a paperboard can be measured using one sheet only. By using the test setup, the dependency of shear zone length on shear strength was investigated. Experimental results show that both the measured shear strength values as well as the shear strength profile varied significantly with different shear zone length. Longer shear zone gave lower shear strength values and flatter profiles, while a shorter shear zone gave higher strength values and more pronounced shear strength profiles that better followed the paperboard ply structure. This proposed new method was also compared with the NST, strip shear test (SST) and rigid shear test (RST) method by using the same test material.

Place, publisher, year, edition, pages
2012. Vol. 52, no 8, 1047-1055 p.
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-103359DOI: 10.1007/s11340-011-9559-zISI: 000308238300007Scopus ID: 2-s2.0-84865703320OAI: oai:DiVA.org:kth-103359DiVA: diva2:560245
Note

QC 20121012

Available from: 2012-10-12 Created: 2012-10-11 Last updated: 2017-12-07Bibliographically 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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