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On failure mechanisms and strength predictions in corrugated board structures
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University , 2014.
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 190
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:miun:diva-21909ISBN: 9789187557620 (print)OAI: oai:DiVA.org:miun-21909DiVA, id: diva2:715790
Public defence
2014-05-27, M108, Mittuniversitetet, Sundsvall, 10:15 (English)
Supervisors
Available from: 2014-05-12 Created: 2014-05-06 Last updated: 2018-03-23Bibliographically approved
List of papers
1. A note on the nonlinear mechanical behavior of planar random network structures subjected to in-plane compression
Open this publication in new window or tab >>A note on the nonlinear mechanical behavior of planar random network structures subjected to in-plane compression
2011 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 45, no 25, p. 2697-2703Article in journal (Refereed) Published
Abstract [en]

The microstructural effect on the mechanical behavior of idealized two-dimensional random fiber networks subjected to in-plane compression is studied. A finite element model utilizing nonlinear beam elements assuming a linearly elastic material is developed. On a macroscopic level, random fiber networks often display an asymmetric material behavior when loaded in tension and compression. In mechanical models, this nonlinearity is traditionally described using continuum elastic-inelastic and/or damage models even though using a continuum approach risks overlooking microstructural effects. It is found that even though a linear elastic material model is used for the individual fibers, the network gives a nonlinear response in compression. The nonlinearity is found to be caused by buckling of individual fibers. This reversible nonlinear mechanism is limited in tensile loading and hence offers an alternative explanation to the global asymmetry of random fiber networks.

Keywords
random fiber network; compression; mechanical behavior; nonlinearity
National Category
Applied Mechanics
Identifiers
urn:nbn:se:miun:diva-15741 (URN)10.1177/0021998311422749 (DOI)000297519800009 ()2-s2.0-82955222951 (Scopus ID)
Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2017-12-08Bibliographically approved
2. Measuring thickness changes of edge-wise compression loaded corrugated board panels using digital image correlation
Open this publication in new window or tab >>Measuring thickness changes of edge-wise compression loaded corrugated board panels using digital image correlation
2012 (English)In: Journal of Sandwich Structures and Materials, ISSN 1099-6362, E-ISSN 1530-7972, Vol. 14, no 1, p. 75-94Article in journal (Refereed) Published
Abstract [en]

This study examines thickness changes in web-core sandwich panels under edgewise compressive loading. Both undamaged and damaged panels were examined. Three-dimensional full-field digital image correlation systems were used to determine deflections on both sides of loaded panels. The change in thickness at any given point in the panel was obtained as the difference between the two displacement fields. It was observed that the thickness was reduced in the post-buckling regime. Damage introduced into the corrugated core by lateral compression proved to significantly reduce the load-carrying capability panels and elevate the thickness reduction of the panels.

Keywords
Corrugated board; compression strength; digital image correlation; thickness
National Category
Applied Mechanics
Identifiers
urn:nbn:se:miun:diva-15742 (URN)10.1177/1099636211419133 (DOI)000299347100004 ()2-s2.0-84856193907 (Scopus ID)
Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2017-12-08Bibliographically approved
3. Modeling of global and local buckling of corrugated board panels loaded in edge-to-edge compression
Open this publication in new window or tab >>Modeling of global and local buckling of corrugated board panels loaded in edge-to-edge compression
2014 (English)In: Journal of Sandwich Structures and Materials, ISSN 1099-6362, E-ISSN 1530-7972, Vol. 16, no 3, p. 272-292Article in journal (Refereed) Published
Abstract [en]

Detailed structural nonlinear finite element modeling of a sandwich panel with corrugated core is performed in this study. A simply supported panel is loaded in uniaxial compression well into the regimes of global panel buckling and local face sheet buckling. The highly nonlinear load versus in-plane and out-of-plane displacement responses obtained from finite element analysis agree reasonably well with experimental results, but the model slightly overpredicts the maximum load. The difference between experiments and predictions is attributed to damage of the corrugated paper web introduced during manufacture of the core and corrugated board. Computations of the buckling also results in a slight thickness reduction of the panel for a large range of face and web thicknesses identify lower thickness limits when the web loses its ability to contribute to the compressive strength of the panel. The highly nonlinear response associated with local and global buckling also results in thickness reduction of the panel.

Place, publisher, year, edition, pages
Sage Publications, 2014
Keywords
buckling, compression strength, Corrugated board
National Category
Applied Mechanics
Identifiers
urn:nbn:se:miun:diva-21906 (URN)10.1177/1099636213519374 (DOI)000334510400002 ()2-s2.0-84898911607 (Scopus ID)
Available from: 2014-05-06 Created: 2014-05-06 Last updated: 2017-06-30Bibliographically approved
4. In situ XCT study of failure mechanisms in corrugated boards subjected to out-ofplane compression
Open this publication in new window or tab >>In situ XCT study of failure mechanisms in corrugated boards subjected to out-ofplane compression
(English)Manuscript (preprint) (Other academic)
National Category
Applied Mechanics
Identifiers
urn:nbn:se:miun:diva-21907 (URN)
Available from: 2014-05-06 Created: 2014-05-06 Last updated: 2014-05-16Bibliographically approved
5. An analysis of strain localization and formation of face wrinkles in edge-wise loaded corrugated sandwich panels using a continuum damage model
Open this publication in new window or tab >>An analysis of strain localization and formation of face wrinkles in edge-wise loaded corrugated sandwich panels using a continuum damage model
2015 (English)In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 56-57, p. 248-257Article in journal (Refereed) Published
Abstract [en]

This paper examines the compressive failure mechanism in edge-to-edge loaded corrugated sandwich panels. The formation of face wrinkles is specifically considered. A detailed finite element model of face sheets and web core of a sandwich panel was developed to provide insight on the failure mechanism. A gradient enhanced continuum damage theory was implemented to capture length effects caused by the material microstructure including formation of damage in the face sheets and core. Distributions of strains in the face sheets determined from finite element analysis (FEA) are compared to experimentally measured strains. The predicted location and orientation of the face wrinkle, as indicated by high values of the second principal strain, agrees well with experimental observations.Load vs. out-of-plane deflection curves obtained from FEA with the gradient enhanced damage material model are compared to those obtained from a linear-elastic material model and experimentally determined curves. The gradient enhanced solution gives qualitatively better agreement with experimental results, although the magnitudes of strains are less than those determined experimentally.

Keywords
Buckling, Compression strength, Corrugated board, Gradient enhanced damage modeling
National Category
Applied Mechanics
Identifiers
urn:nbn:se:miun:diva-21908 (URN)10.1016/j.ijsolstr.2014.10.029 (DOI)000349502600020 ()2-s2.0-84921433231 (Scopus ID)
Note

Published online 27th March 2014.

Available from: 2014-05-06 Created: 2014-05-06 Last updated: 2017-08-15Bibliographically approved

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Åslund, Pär

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