Advanced

Strength grading of narrow dimension Norway spruce side boards in the wet state using first axial resonance frequency

Oscarsson, Jan; Olsson, Anders; Johansson, Marie; Enquist, Bertil and Serrano, Erik LU (2011) In International Wood Products Journal 2(2). p.108-114
Abstract
<p>Strength grading of Norway spruce (<em>Picea abies </em>(L.) Karst.) side boards in the wet state was investigated. For a sample of 58 boards, density and dynamic modulus of elasticity in the axial direction, MOE<sub>dyn</sub>, were determined in the wet state. The boards were then split into two parts and the procedure of determining MOE<sub>dyn</sub> was repeated both before and after the boards were dried to a target moisture content of 12 %. Finally, tensile strength of the split boards was measured and its relationship to MOE<sub>dyn</sub> for both wet and dried split boards determined. The investigation also included an evaluation of a so called reversed lamination effect on... (More)
<p>Strength grading of Norway spruce (<em>Picea abies </em>(L.) Karst.) side boards in the wet state was investigated. For a sample of 58 boards, density and dynamic modulus of elasticity in the axial direction, MOE<sub>dyn</sub>, were determined in the wet state. The boards were then split into two parts and the procedure of determining MOE<sub>dyn</sub> was repeated both before and after the boards were dried to a target moisture content of 12 %. Finally, tensile strength of the split boards was measured and its relationship to MOE<sub>dyn</sub> for both wet and dried split boards determined. The investigation also included an evaluation of a so called reversed lamination effect on the stiffness caused by the splitting of boards into two parts. The results show that strength grading of split boards in the wet state can give just as good results as grading performed after drying. The reversed lamination effect on the stiffness of split boards was found to be of lower order.</p> (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
strength-grading, axial stiffness, side boards, wet state, green state
in
International Wood Products Journal
volume
2
issue
2
pages
108 - 114
publisher
Maney Publishing
external identifiers
  • scopus:80155204567
ISSN
2042-6445
DOI
10.1179/2042645311Y.0000000015
language
English
LU publication?
no
id
74abcc63-04de-4d24-8bcb-fdd8efdd66ad (old id 4770350)
date added to LUP
2014-11-07 14:58:43
date last changed
2017-01-01 05:46:07
@article{74abcc63-04de-4d24-8bcb-fdd8efdd66ad,
  abstract     = {&lt;p&gt;Strength grading of Norway spruce (&lt;em&gt;Picea abies &lt;/em&gt;(L.) Karst.) side boards in the wet state was investigated. For a sample of 58 boards, density and dynamic modulus of elasticity in the axial direction, MOE&lt;sub&gt;dyn&lt;/sub&gt;, were determined in the wet state. The boards were then split into two parts and the procedure of determining MOE&lt;sub&gt;dyn&lt;/sub&gt; was repeated both before and after the boards were dried to a target moisture content of 12 %. Finally, tensile strength of the split boards was measured and its relationship to MOE&lt;sub&gt;dyn&lt;/sub&gt; for both wet and dried split boards determined. The investigation also included an evaluation of a so called reversed lamination effect on the stiffness caused by the splitting of boards into two parts. The results show that strength grading of split boards in the wet state can give just as good results as grading performed after drying. The reversed lamination effect on the stiffness of split boards was found to be of lower order.&lt;/p&gt;},
  author       = {Oscarsson, Jan and Olsson, Anders and Johansson, Marie and Enquist, Bertil and Serrano, Erik},
  issn         = {2042-6445},
  keyword      = {strength-grading,axial stiffness,side boards,wet state,green state},
  language     = {eng},
  number       = {2},
  pages        = {108--114},
  publisher    = {Maney Publishing},
  series       = {International Wood Products Journal},
  title        = {Strength grading of narrow dimension Norway spruce side boards in the wet state using first axial resonance frequency},
  url          = {http://dx.doi.org/10.1179/2042645311Y.0000000015},
  volume       = {2},
  year         = {2011},
}