USING HOMOGENIZATION AND NANOINDENTATION FOR MICROFIBRIL ANGLE DETERMINATION OF SPRUCE
This paper is concerned with the evaluation of microfibril angle of spruce. The microfibril angle is defined as an inclination of microfibrils from the longitudinal axis, the direction of lumens. It is well known and further supported by the present study that the microfibril angle has a great influ...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
CTU Central Library
2017-11-01
|
Series: | Acta Polytechnica CTU Proceedings |
Subjects: | |
Online Access: | https://ojs.cvut.cz/ojs/index.php/APP/article/view/4631 |
id |
doaj-8459767004e24aa1b19aa4e3b523fe15 |
---|---|
record_format |
Article |
spelling |
doaj-8459767004e24aa1b19aa4e3b523fe152020-11-24T22:23:58ZengCTU Central LibraryActa Polytechnica CTU Proceedings2336-53822017-11-01130717410.14311/APP.2017.13.00713997USING HOMOGENIZATION AND NANOINDENTATION FOR MICROFIBRIL ANGLE DETERMINATION OF SPRUCELucie Kucíková0Vladimír Hrbek1Jan Vorel2Michal Šejnoha3Czech Technical University in Prague, Faculty of Civil Engineering, Thákurova 7, 166 29 Prague 6, Czech RepublicCzech Technical University in Prague, Faculty of Civil Engineering, Thákurova 7, 166 29 Prague 6, Czech Republic Institute of Theoretical and Applied Mechanics AS CR, v. v. i., Prosecká 809/76, 190 00 Prague 9, Czech RepublicCzech Technical University in Prague, Faculty of Civil Engineering, Thákurova 7, 166 29 Prague 6, Czech RepublicCzech Technical University in Prague, Faculty of Civil Engineering, Thákurova 7, 166 29 Prague 6, Czech RepublicThis paper is concerned with the evaluation of microfibril angle of spruce. The microfibril angle is defined as an inclination of microfibrils from the longitudinal axis, the direction of lumens. It is well known and further supported by the present study that the microfibril angle has a great influence on the final mechanical properties of wood. This angle could be measured either directly using, e.g. polarisation microscopy, X-ray diffraction, infrared spectroscopy, or indirectly, as used in this study, by employing the nanoindentation measurements. Therein, the measured indentation modulus is compared with that obtained numerically using the anisotropic theory of indentation. The latter one depends on the entire stiffness matrix derived through homogenization and the searched microfibril angle. In view of the cell wall microstructure, the effective cell properties were found using the two-step micromechanical homogenization adopting both the Self-consistent and Mori-Tanaka methods.https://ojs.cvut.cz/ojs/index.php/APP/article/view/4631Spruce, nanoindentation, microfibril angle, homogenization |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lucie Kucíková Vladimír Hrbek Jan Vorel Michal Šejnoha |
spellingShingle |
Lucie Kucíková Vladimír Hrbek Jan Vorel Michal Šejnoha USING HOMOGENIZATION AND NANOINDENTATION FOR MICROFIBRIL ANGLE DETERMINATION OF SPRUCE Acta Polytechnica CTU Proceedings Spruce, nanoindentation, microfibril angle, homogenization |
author_facet |
Lucie Kucíková Vladimír Hrbek Jan Vorel Michal Šejnoha |
author_sort |
Lucie Kucíková |
title |
USING HOMOGENIZATION AND NANOINDENTATION FOR MICROFIBRIL ANGLE DETERMINATION OF SPRUCE |
title_short |
USING HOMOGENIZATION AND NANOINDENTATION FOR MICROFIBRIL ANGLE DETERMINATION OF SPRUCE |
title_full |
USING HOMOGENIZATION AND NANOINDENTATION FOR MICROFIBRIL ANGLE DETERMINATION OF SPRUCE |
title_fullStr |
USING HOMOGENIZATION AND NANOINDENTATION FOR MICROFIBRIL ANGLE DETERMINATION OF SPRUCE |
title_full_unstemmed |
USING HOMOGENIZATION AND NANOINDENTATION FOR MICROFIBRIL ANGLE DETERMINATION OF SPRUCE |
title_sort |
using homogenization and nanoindentation for microfibril angle determination of spruce |
publisher |
CTU Central Library |
series |
Acta Polytechnica CTU Proceedings |
issn |
2336-5382 |
publishDate |
2017-11-01 |
description |
This paper is concerned with the evaluation of microfibril angle of spruce. The microfibril angle is defined as an inclination of microfibrils from the longitudinal axis, the direction of lumens. It is well known and further supported by the present study that the microfibril angle has a great influence on the final mechanical properties of wood. This angle could be measured either directly using, e.g. polarisation microscopy, X-ray diffraction, infrared spectroscopy, or indirectly, as used in this study, by employing the nanoindentation measurements. Therein, the measured indentation modulus is compared with that obtained numerically using the anisotropic theory of indentation. The latter one depends on the entire stiffness matrix derived through homogenization and the searched microfibril angle. In view of the cell wall microstructure, the effective cell properties were found using the two-step micromechanical homogenization adopting both the Self-consistent and Mori-Tanaka methods. |
topic |
Spruce, nanoindentation, microfibril angle, homogenization |
url |
https://ojs.cvut.cz/ojs/index.php/APP/article/view/4631 |
work_keys_str_mv |
AT luciekucikova usinghomogenizationandnanoindentationformicrofibrilangledeterminationofspruce AT vladimirhrbek usinghomogenizationandnanoindentationformicrofibrilangledeterminationofspruce AT janvorel usinghomogenizationandnanoindentationformicrofibrilangledeterminationofspruce AT michalsejnoha usinghomogenizationandnanoindentationformicrofibrilangledeterminationofspruce |
_version_ |
1725763066957660160 |