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  Identification of polymer matrix yield stress in the wood cell wall based on micropillar compression and micromechanical modelling

Schwiedrzik, J., Raghavan, R., Rüggeberg, M., Hansen, S., Wehrs, J., Adusumalli, R. B., et al. (2016). Identification of polymer matrix yield stress in the wood cell wall based on micropillar compression and micromechanical modelling. Philosophical Magazine, 96(32-34), 3461-3478. doi:10.1080/14786435.2016.1235292.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-B288-C Version Permalink: http://hdl.handle.net/21.11116/0000-0001-B289-B
Genre: Journal Article

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 Creators:
Schwiedrzik, Jakob1, Author              
Raghavan, Rejin2, 3, Author              
Rüggeberg, Markus4, 5, Author              
Hansen, Silla1, 6, Author              
Wehrs, Juri2, Author              
Adusumalli, Ramesh B.1, 7, Author              
Zimmermann, Tanja5, Author              
Michler, Johann8, Author              
Affiliations:
1Laboratory for Mechanics of Materials and Nanostructures, Empa Swiss Federal Laboratories for Material Science and Technology, Thun, Switzerland, persistent22              
2Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, Thun, Switzerland, ou_persistent22              
3Synthesis of Nanostructured Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863403              
4Institute for Building Materials, ETH Zürich, Zürich, Switzerland, persistent22              
5Laboratory for Applied Wood Materials, Empa Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland, persistent22              
6Institute for Biological Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany, persistent22              
7Department of Chemical Engineering, BITS Pilani-Hyderabad Campus, Hyderabad, India, persistent22              
8Empa – Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Thun, Switzerland, persistent22              

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Free keywords: Biomechanics; Cells; Composite micromechanics; Cytology; Lignin; Micromechanics; Polymer matrix; Stresses; Wood, Continuum micromechanics; Experimental approaches; Hierarchical materials; Inhomogeneous materials; Micro-mechanical modeling; Micro-pillar compressions; Micromechanical modelling; Wood cell walls, Yield stress
 Abstract: Based on a combination of micropillar compression experiments and modelling of the secondary cell wall (cw) using continuum micromechanics, the shear yield stress of the polymer matrix is identified for both normal and compression wood of Norway spruce. It is shown that the model is able to capture the differences in mechanical properties between the two tissues based on the knowledge of composition of the samples, microfibril angle, as well as phase properties on the nanometer scale. By testing an isolated piece of the cell wall with a homogeneous and uniaxial stress field on the micrometer scale and using the micromechanical model to determine average stress fields on the nanometer scale, it is possible to identify the shear yield stress of the polymer matrix in wood, which was found to be in the range of 14.9–17.5 MPa for normal and compression wood. It was shown that this corresponds to a stress in the lignin phase of approx. 17 MPa. This combined study thus demonstrates a new approach for validating multiscale models predicting yield properties with uniaxial experiments at the microscale and measuring phase properties of inhomogeneous materials by a combination of modelling and experimental approaches. © 2016 Empa Swiss Federal Laboratory for Materials Science and Technology.

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Language(s): eng - English
 Dates: 2016-12-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1080/14786435.2016.1235292
BibTex Citekey: Schwiedrzik20163461
 Degree: -

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Title: Philosophical Magazine
  Abbreviation : Philos. Mag.
Source Genre: Journal
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Publ. Info: Milton Park, Abingdon, England : Taylor & Francis
Pages: - Volume / Issue: 96 (32-34) Sequence Number: - Start / End Page: 3461 - 3478 Identifier: ISSN: 1478-6435
CoNE: /journals/resource/954925265237