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The dependency of shear zone lengh on the shear strength profiles in paperboard
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.). KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center BiMaC Innovation.
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2011 (English)Report (Other academic)
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.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology , 2011.
Series
TRITA-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0501
Keyword [en]
out-of-plane, shear test, tilted double notched, lamination, paperboard
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-31512OAI: oai:DiVA.org:kth-31512DiVA: diva2:404450
Note

QC 20110317

Available from: 2011-03-17 Created: 2011-03-17 Last updated: 2016-05-25Bibliographically approved
In thesis
1. Numerical and experimental investigation of paperboard creasing and folding
Open this publication in new window or tab >>Numerical and experimental investigation of paperboard creasing and folding
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

 This licentiate thesis aims to increase the understanding of deformation and damage mechanisms of paperboard during converting, especially creasing and folding will be analyzed.

 A simple two dimensional creasing simulation was performed. In this model, paperboard was modeled as a combination of an anisotropic elastic-plastic continuum model with isotropic hardening and a softening cohesive interface model. The paperboard was composed of four plies with uniform material parameters. Creasing simulations were done on both machine direction (MD) and cross machine direction (CD) samples to two crease depths 0.0 mm and 0.2 mm, respectively. The simulation results showed good agreement with experimental results.

 The out-of-plane shear properties are dominating factors for creasing and folding. Therefore, a test method to determine shear properties was proposed. This part of the work is based on the most recently proposed test method, the laminated double notch shear test. To improve the technique, double notches with declined slopes, called tilted double notch shear test, were used instead of uniform depth double notches. The influence of shear zone length was also investigated. The results reveal the short shear zone lengths gave higher shear strength and more pronounced shear strength profile.

 The results from the rst two analyses were utilized to study folding of paperboard. The simulation model was the same as in the creasing simulations. However, to improve the model and better account the actual micro structure of paperboard a new material mapping method was proposed. The continuum properties of the plies were assumed to vary in the thickness direction. The shear strengths of the interfaces were determined by using the tilted double notch shear test using a short shear zone length, L= 5 mm. The agreement between simulation results and experiment results was good, and most of the folding properties were captured.

 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. 28 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0503
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-31430 (URN)
Presentation
2011-03-24, Sal E31, KTH, Lindstedtsvägen 3, Stockholm, 10:15 (English)
Opponent
Supervisors
Note

QC 20110317

Available from: 2011-03-17 Created: 2011-03-15 Last updated: 2013-01-15Bibliographically approved

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