ANALYSIS OF HYGRO-MECHANICAL BEHAVIOR OF WOOD IN BENDING

Wood and Fiber Science

View Publication Info
 
 
Field Value
 
Title ANALYSIS OF HYGRO-MECHANICAL BEHAVIOR OF WOOD IN BENDING
 
Creator Florisson, S.
Muszynski, L.
Vessby, J.
 
Subject Building technology
Bending; solid wood; Norway spruce; creep; experimental methodology; mechano-sorption; viscoelasticity
10.500 CREEP; 20.200 MOISTURE; 20.300 DIMENSIONAL STABILITY
 
Description The empirical test developed as validation for a new beam element model that can account for both mechanical and environmental load action in finite element analysis is presented. The testing protocol allows for the identification and analysis of contributing deflection components in bending under varying MC conditions, including mechano-sorption. The components of deflection in the shear-free span of a four-point bending test and their responses to varying moisture are evaluated with an analytical procedure. The experiment was conducted on clear-straight-grained sapwood and heartwood specimens of Norway spruce (Picea Abies)(30 x 15 x 640 mm3). The program consisted of three phases: (1.) long term (LT) experiments under constant temperature of 60oC and relative humidity (RH) cycles between 40% and 80%, (2.) a short term static experiment to determine the variation in the sample set and the load-level of the LT experiment on end-matched specimens, and (3) creep tests at 60o and constant humidity at either 40% or 80% to determine the effect of moisture on the viscoelastic creep. Mass changes and hygro-expansion measured on matched specimens were used in the analytical method. Constitutive models used for describing the material-level response to loads and moisture changes were applied to the shear-free segment of the specimens disregarding actual moisture gradients and fiber orientation inside the test specimens. A successful identification of each deflection component and isolation of mechano-sorption component was accomplished. In the 90 da of testing, the dominant component of the total deflection was the elastic component, followed by the mechano-sorptive component. Creep was found to be nonnegligible and important in the correct description of mechano-sorption. The effect of moisture on the viscoelastic behavior showed most important during loading and first stages of decreasing deflection rate phase.
 
Publisher Wood and Fiber Science
 
Contributor
 
Date 2021-02-05
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

 
Format application/pdf
 
Identifier http://wfs.swst.org/index.php/wfs/article/view/3016
 
Source Wood and Fiber Science; Vol 53, No 1 (2021); 27-47
0735-6161
0735-6161
 
Language eng
 
Relation http://wfs.swst.org/index.php/wfs/article/view/3016/2609
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1818
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1819
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1820
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1821
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1822
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1823
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1824
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1825
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1826
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1827
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1828
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1829
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1830
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1831
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1832
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1833
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1834
http://wfs.swst.org/index.php/wfs/article/downloadSuppFile/3016/1835
 
Rights Copyright (c) 2021 Wood and Fiber Science
 

Contact Us

The PKP Index is an initiative of the Public Knowledge Project.

For PKP Publishing Services please use the PKP|PS contact form.

For support with PKP software we encourage users to consult our wiki for documentation and search our support forums.

For any other correspondence feel free to contact us using the PKP contact form.

Find Us

Twitter

Copyright © 2015-2018 Simon Fraser University Library