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Publications (10 of 88) Show all publications
Linvill, E., Wallmeier, M. & Östlund, S. (2017). A Constitutive Model for Paperboard Including Wrinkle Prediction and Post-Wrinkle Behavior Applied to Deep Drawing. Stockholm: KTH Royal Institute of Technology.
Open this publication in new window or tab >>A Constitutive Model for Paperboard Including Wrinkle Prediction and Post-Wrinkle Behavior Applied to Deep Drawing
2017 (English)Report (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 43 p.
Series
TRITA-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 606
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-199283 (URN)
Note

QC 20170104

Available from: 2017-01-03 Created: 2017-01-03 Last updated: 2017-01-04Bibliographically approved
Linvill, E., Larsson, P. & Östlund, S. (2017). Advanced Three-Dimensional Paper Structures: Mechanical Characterization and Forming of Sheets Made from Modied Cellulose Fibers. Stockholm: KTH Royal Institute of Technology.
Open this publication in new window or tab >>Advanced Three-Dimensional Paper Structures: Mechanical Characterization and Forming of Sheets Made from Modied Cellulose Fibers
2017 (English)Report (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 43 p.
Series
TRITA-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 607
National Category
Materials Engineering Polymer Technologies Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-199284 (URN)
Note

QC 20170104

Available from: 2017-01-03 Created: 2017-01-03 Last updated: 2017-03-01Bibliographically approved
Linvill, E. & Östlund, S. (2016). Parametric Study of Hydroforming of Paper Materials Using the Explicit Finite Element Method with a Moisture-dependent and Temperature-dependent Constitutive Model. Packaging technology & science, 29(3), 145-160.
Open this publication in new window or tab >>Parametric Study of Hydroforming of Paper Materials Using the Explicit Finite Element Method with a Moisture-dependent and Temperature-dependent Constitutive Model
2016 (English)In: Packaging technology & science, ISSN 0894-3214, E-ISSN 1099-1522, Vol. 29, no 3, 145-160 p.Article in journal (Refereed) Published
Abstract [en]

A moisture-dependent and temperature-dependent constitutive model for paper materials was proposed and implemented into a finite element model of the paper hydroforming process. Experimental hydroforming was conducted at temperatures of 23°C and 110 °C and moisture contents of 6.9 and 10.6 (respectively corresponding to 50 and 80% relative humidity). The proposed model, which also included the effects of drying, captured the extent of forming of all experimental results within reasonable accuracy. For the moisture content and temperature conditions in this study, the phenomenon of drying was found to be the reason why the application of temperature had a much greater effect on the degree of forming than hydroforming at various moisture contents. A simulation-based parametric study was conducted in order to identify the importance of various process and material parameters. This parametric study confirmed many previous empirical findings and was capable of quantifying the extent to which these process and material parameters affect the three-dimensional formability of paper. The coefficient of friction was identified as one of the most important factors when determining the extent of forming.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2016
Keyword
hydroforming, paper, finite element method, moisture, temperature
National Category
Paper, Pulp and Fiber Technology
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:kth:diva-180658 (URN)10.1002/pts.2193 (DOI)000370202200002 ()2-s2.0-84955598556 (Scopus ID)
Projects
BiMaC Innovation
Note

QC 20160308. QC 20160319

Available from: 2016-01-19 Created: 2016-01-19 Last updated: 2017-11-30Bibliographically approved
Tjahjanto, D. D., Girlanda, O. & Östlund, S. (2015). Anisotropic viscoelastic-viscoplastic continuum model for high-density cellulose-based materials. Journal of the mechanics and physics of solids, 84, 1-20.
Open this publication in new window or tab >>Anisotropic viscoelastic-viscoplastic continuum model for high-density cellulose-based materials
2015 (English)In: Journal of the mechanics and physics of solids, ISSN 0022-5096, E-ISSN 1873-4782, Vol. 84, 1-20 p.Article in journal (Refereed) Published
Abstract [en]

A continuum material model is developed for simulating the mechanical response of high-density cellulose-based materials subjected to stationary and transient loading. The model is formulated in an infinitesimal strain framework, where the total strain is decomposed into elastic and plastic parts. The model adopts a standard linear viscoelastic solid model expressed in terms of Boltzmann hereditary integral form, which is coupled to a rate-dependent viscoplastic formulation to describe the irreversible plastic part of the overall strain. An anisotropic hardening law with a kinematic effect is particularly adopted in order to capture the complex stress-strain hysteresis typically observed in polymeric materials. In addition, the present model accounts for the effects of material densification associated with through-thickness compression, which are captured using an exponential law typically applied in the continuum description of elasticity in porous media. Material parameters used in the present model are calibrated to the experimental data for high-density (press)boards. The experimental characterization procedures as well as the calibration of the parameters are highlighted. The results of the model simulations are systematically analyzed and validated against the corresponding experimental data. The comparisons show that the predictions of the present model are in very good agreement with the experimental observations for both stationary and transient load cases.

Keyword
Anisotropic-kinematic hardening, Cellulose-based materials, Creep, Material densification, Stress relaxation, Viscoelasticity, Viscoplasticity, Anisotropy, Calibration, Cellulose, Continuum mechanics, Hardening, Kinematics, Plastic parts, Porous materials, Anisotropic hardening laws, Cellulose based materials, Continuum description, Experimental characterization, Kinematic hardening, Linear viscoelastic solid, Through-thickness compressions, Characterization
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-175624 (URN)10.1016/j.jmps.2015.07.002 (DOI)000364887400001 ()2-s2.0-84938061258 (Scopus ID)
Note

QC 20151027

Available from: 2015-10-27 Created: 2015-10-19 Last updated: 2017-12-01Bibliographically approved
Wallmeier, M., Linvill, E., Hauptmann, M., Majschak, J.-P. & Östlund, S. (2015). Explicit FEM analysis of the deep drawing of paperboard. Mechanics of materials (Print), 89, 202-215, Article ID 2441.
Open this publication in new window or tab >>Explicit FEM analysis of the deep drawing of paperboard
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2015 (English)In: Mechanics of materials (Print), ISSN 0167-6636, E-ISSN 1872-7743, Vol. 89, 202-215 p., 2441Article in journal (Refereed) Published
Abstract [en]

An explicit finite element model of the deep-drawing of paperboard has been developed utilizing a custom yet simple material model which describes the anisotropy and plasticity of paperboard. The model was verified with a variety of tests and was then utilized to compare the punch force that was measured during the deep-drawing experiments to the punch force that was calculated during the deep-drawing simulations. All material parameters were calibrated based on individual experiments; thus, no parameter fitting was utilized to match the experimental deep-drawing results. The model was found to predict the experimental results with reasonable accuracy up to the point when wrinkling began to dominate the material response. Since most failures during paperboard deep-drawing occur before wrinkling begins to play a major role, this model can probably be utilized to study and predict the failure of deep-drawn paperboard cups. The overall trends and the effects of major process parameters are predicted by the model. The process parameters that were varied and compared for both experiments and simulations were: blankholder force, die temperature, and thickness. The model was utilized to discover that friction of the blankholder and die have significant effects on the punch force and thus the stress, implying that low-friction dies and blankholders can considerably reduce the failure probability and thus also improve the quality of deep-drawn paperboard cups.

Keyword
Deep-drawing, Paperboard, 3D-forming, Simulation, FEM; Modelling
National Category
Paper, Pulp and Fiber Technology
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:kth:diva-171041 (URN)10.1016/j.mechmat.2015.06.014 (DOI)000359962400017 ()2-s2.0-84936759657 (Scopus ID)
Note

QC 20150805

Available from: 2015-07-13 Created: 2015-07-13 Last updated: 2017-12-04Bibliographically approved
Linvill, E. & Östlund, S. (2015). Parametric Study of Hydroforming of Paper Materials using the Explicit Finite Element Method with a Moisture-and Temperature-Dependent Constitutive Model. Stockholm: KTH Royal Institute of Technology.
Open this publication in new window or tab >>Parametric Study of Hydroforming of Paper Materials using the Explicit Finite Element Method with a Moisture-and Temperature-Dependent Constitutive Model
2015 (English)Report (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. 29 p.
Series
TRITA-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 575
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-173114 (URN)
Note

QC 20150907

Available from: 2015-09-07 Created: 2015-09-07 Last updated: 2015-09-07Bibliographically approved
Dominic, C. A. S., Östlund, S., Buffington, J. & Masoud, M. M. (2015). Towards a conceptual sustainable packaging development model: A corrugated box case study. Packaging technology & science, 28(5), 397-413.
Open this publication in new window or tab >>Towards a conceptual sustainable packaging development model: A corrugated box case study
2015 (English)In: Packaging technology & science, ISSN 0894-3214, E-ISSN 1099-1522, Vol. 28, no 5, 397-413 p.Article in journal (Refereed) Published
Abstract [en]

Corrugated package designers are focused on balancing the need for product protection, material use efficiency and the packaging material's impact on the environment in the supply chain. The purpose of this paper is to develop a conceptual sustainable packaging model that integrates the variables of technical design, supply chain systems and environmental factors and then use the model to identify to improve upon corrugated container design. A model was developed, from the extant literature, and a case study was performed on a corrugated container. This is believed to be a unique integrated model of most relevant agents related to the design and implementation of a corrugated box through a supply chain from design to potential post-consumer reuse. From this study, we found opportunities to improve the environmental design of the corrugated container through four ex ante design stages, and two ex post facto supply chain stages. Further, research can evaluate and refine this model via a 'live supply chain' for use in guiding corrugated box material selection design and reuse/recycling. Integration of the design criterion for a unit load in the supply chain creates opportunity to observe the packaging system holistically. Waste in the manufacturing process and CO<inf>2</inf> emissions are traced along the material flow until the end of its useful life to provide an overall picture of the packaging system.

Keyword
CO2, compression strength, corrugated box design, supply chain, sustainable packaging, waste
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-166954 (URN)10.1002/pts.2113 (DOI)000353163800002 ()2-s2.0-84927725758 (Scopus ID)
Note

QC 20150529

Available from: 2015-05-29 Created: 2015-05-21 Last updated: 2017-12-04Bibliographically approved
Tjahjanto, D., Girlanda, O., Ask, A. & Östlund, S. (2014). Constitutive model for high-density cellulose-based materials. In: A. Eriksson, A. Kulachenko, M. Mihaescu and G. Tibert (Ed.), Proceedings of 27th Nordic Seminar on Computational Mechanics: . Paper presented at 27th Nordic Seminar on Computational Mechanics. 22-24 October. KTH.
Open this publication in new window or tab >>Constitutive model for high-density cellulose-based materials
2014 (English)In: Proceedings of 27th Nordic Seminar on Computational Mechanics / [ed] A. Eriksson, A. Kulachenko, M. Mihaescu and G. Tibert, KTH, 2014Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
KTH: , 2014
Keyword
Viscoelasticity, Viscoplasticity, Material Densification, Cellulose-based Materials
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:kth:diva-184476 (URN)
Conference
27th Nordic Seminar on Computational Mechanics. 22-24 October
Note

QC 20160414

Available from: 2016-03-31 Created: 2016-03-31 Last updated: 2016-04-14Bibliographically approved
Girlanda, O., Tjahjanto, D. D., Östlund, S., Ask, A., Forslin, J. & Schmidt, L. E. (2014). Modeling and experimental validation of the mechanical behavior of pressboard. In: Proceedings of the 2014 Electrical Insulation Conference: . Paper presented at 2014 IEEE Electrical Insulation Conference (EIC),8-11 June 2014, Philadelphia, USA (pp. 203-207). IEEE conference proceedings.
Open this publication in new window or tab >>Modeling and experimental validation of the mechanical behavior of pressboard
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2014 (English)In: Proceedings of the 2014 Electrical Insulation Conference, IEEE conference proceedings, 2014, 203-207 p.Conference paper, Published paper (Refereed)
Abstract [en]

High density (HD) pressboard is an essential element in power transformers combining good electrical insulation properties with effective mechanical characteristics that well suit design requirements of power transformers. In order to ensure a correctly functioning transformer, it is therefore very important to characterize and to understand the mechanical properties of pressboard under different operating conditions.

Pressboard is composed of natural polymeric chains, whose mechanical properties are affected by moisture and temperature. Moreover, temperature and moisture conditions in power transformers vary throughout manufacturing process and service/operation life-time. An accurate definition of the mechanical properties is, therefore, necessary.

The present article focuses on the effect of different combinations of temperature/moisture and mechanical load on the deformation behavior of HD pressboard samples. A mechanical constitutive model is developed for finite element (FEM) simulation based on a viscoelastic–viscoplastic material description. Special attention is given on the complex through-thickness deformation behavior of HD pressboard. Thorough analyses are performed based on the comparisons between the results of experimental characterization and FEM modeling and simulations. The good agreement between experimental and modeling results shows a great potential for application in mechanical design of transformer insulation.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2014
Keyword
Pressboard, Mechanical properties, Temperature–moisture sensitivity, Compressbility test
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:kth:diva-163903 (URN)10.1109/EIC.2014.6869376 (DOI)2-s2.0-84906491074 (Scopus ID)
Conference
2014 IEEE Electrical Insulation Conference (EIC),8-11 June 2014, Philadelphia, USA
Note

QC 20150413

Available from: 2015-04-13 Created: 2015-04-13 Last updated: 2015-04-13Bibliographically approved
Linvill, E. & Östlund, S. (2014). The Combined Effects of Moisture and Temperature on the Mechanical Response of Paper. Experimental mechanics, 54(8), 1329-1341.
Open this publication in new window or tab >>The Combined Effects of Moisture and Temperature on the Mechanical Response of Paper
2014 (English)In: Experimental mechanics, ISSN 0014-4851, E-ISSN 1741-2765, Vol. 54, no 8, 1329-1341 p.Article in journal (Refereed) Published
Abstract [en]

To model advanced 3-D forming strategies for paper materials, the effects of environmental conditions on the mechanical behavior must be quantitatively and qualitatively understood. A tensile test method has been created, verified, and implemented to test paper at various moisture content and temperature levels. Testing results for one type of paper for moisture contents from 6.9 to 13.8 percent and temperatures from 23 to 168 degrees Celsius are presented and discussed. Coupled moisture and temperature effects have been discovered for maximum stress. Uncoupled effects have been discovered for elastic modulus, tangent modulus, hardening modulus, strain at break, tensile energy absorption (TEA), and approximate plastic strain. A hyperbolic tangent function is also utilized which captures the entire one-dimensional stress-strain response of paper. The effects of moisture and temperature on the three coefficients in the hyperbolic tangent function may be assumed to be uncoupled, which may simplify the development of moisture- and temperature-dependent constitutive models. All parameters were affected by both moisture and temperature with the exception of TEA, which was found to only be significantly dependent on temperature.

Place, publisher, year, edition, pages
Springer-Verlag New York, 2014
Keyword
Moisture, Temperature, Elastic properties, Plastic properties, Forming, Paper
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-154368 (URN)10.1007/s11340-014-9898-7 (DOI)000341812900003 ()2-s2.0-84907704336 (Scopus ID)
Note

QC 20141020

Available from: 2014-10-20 Created: 2014-10-20 Last updated: 2017-12-05Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-8699-7910

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