期刊
HOLZFORSCHUNG
卷 74, 期 9, 页码 899-904出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/hf-2019-0128
关键词
beech; cell wall; mechanical properties; micropillar compression; nanoindentation
资金
- Horizon 2020 Framework Programme of the European Union
- H2020 WIDESPREAD-2-Teaming [739574]
- Republic of Slovenia, Investment funding of the Republic of Slovenia
- European Union of the European Regional Development Fund
- Slovenian Research Agency [10-0035]
Wood exhibits very different behavior and properties at different scales. One important scale is the cell wall (CW) that is commonly tested by nanoindentation. Common nanoindentation provides important insight into the material but has limitations because it does not apply uniaxial stress and provides data from single spots. Therefore, the aim was to examine beech CW using two state-of-the-art techniques: micropillar compression (MCo) and nanoindentation mapping (NIP). The mean strength of the beech CW was found to be about 276 MPa and the mean yield stress was 183 MPa. These values were higher than those in most cited literature, which was attributed to the fact that libriform fibers from beech late wood were measured. Mean F obtained from MCo was about 7.95 GPa, which was lower than the values obtained on a macrolevel and about 61% of the value obtained from NIP. NIP also showed that F of the CW around the middle lamella (ML) was about 64% of the value at the location attributed to the S-2 layer. Lower E from MCo may be caused by sinking of the micropillar into the wood structure under the load. Failure of the micropillars showed gradual collapse into themselves, with debonding at the S-3 layer or the MLs.
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