• français
    • English
    français
  • Login
Help
View Item 
  •   Home
  • Laboratoire des Matériaux et Procédés (LaBoMaP)
  • View Item
  • Home
  • Laboratoire des Matériaux et Procédés (LaBoMaP)
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Performance of timber board models for prediction of local bending stiffness and strength—with application on douglas fir sawn timber

Article dans une revue avec comité de lecture
Author
OLSSON, Anders
136146 Linnaeus University
HU, Min
136146 Linnaeus University
OSCARSSON, Jan
136146 Linnaeus University
ccPOT, Guillaume
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
ccVIGUIER, Joffrey

URI
http://hdl.handle.net/10985/23009
DOI
10.22382/wfs-2022-22
Date
2022
Journal
WOOD AND FIBER SCIENCE

Abstract

Efficient utilization of structural timber requires accurate methods for machine strength grading. One of the most accurate methods presented this far is based on data of local fiber orientation on board surfaces, obtained from laser scanning., in combination with data of axial resonance frequency and board density. The method, by which local bending stiffness is calculated and used as indicating property to bending strength, has been evaluated by means of large samples of timber boards, and settings for machine strength grading of Norway spruce sawn timber have been determined and approved for use on the European market. In this paper, two potential improvements of this method are examined. The first one consists of replacing a model based on simple integration over cross sections of boards for calculation of local bending stiffness by a 3D solid finite element model from which local bending stiffness is derived. The second improvement concerns replacement of a simple model for the fiber orientation in the interior of board by a more advanced one taking location of pith and growth direction of knots into account. Application of the alternative models on a sample of more than 200 Douglas fir boards, size 40 × 100 × 3000 mm, cut from large logs, show that each of the evaluated model improvements contributes to improved grading accuracy. When local bending stiffness is calculated utilizing the herein suggested finite element model in combination with the improved model of fiber orientation in the interior of boards, a coefficient of determination to bending strength as high as 0.76 is obtained. For comparison, a coefficient of determination of 0.71 is obtain using the simpler original models. Thus, strength grading of structural timber based on the suggested improvements would make it possible to increase the yield in higher strength classes.

Files in this item

Name:
LaBoMaP_JWoodSci_2022_POT.pdf
Size:
1.971Mb
Format:
PDF
Embargoed until:
2023-04-01
View/Open

Collections

  • Laboratoire des Matériaux et Procédés (LaBoMaP)

Related items

Showing items related by title, author, creator and subject.

  • 3D fibre orientation reconstruction around a knot in Douglas fir 
    Communication avec acte
    ccPENVERN, Hélène; ccPOT, Guillaume; ccVIGUIER, Joffrey; ccCOLLET, Robert; ccDEMOULIN, Leyne; ROUX, Benjamin; OLSSON, Anders; HU, Min (2023-09-05)
    This work is exhibiting a new laboratory investigation method to obtain fibre 3D angle measurement of a wood piece after successive planing of the whole specimen. By combining in-plane fibre measurements through laser ...
  • A laboratory method to determine 3D fibre orientation around knots in sawn timber: case study on a Douglas fir specimen 
    Article dans une revue avec comité de lecture
    ccPENVERN, Hélène; ccDEMOULIN, Leyne; ccPOT, Guillaume; ccVIGUIER, Joffrey; ROUX, Benjamin; HU, Min; OLSSON, Anders (Springer Science and Business Media LLC, 2024-08-09)
    The mechanical properties of structural timber largely depend on the occurrence of knots and on fibre deviation in their vicinities. In recent strength grading machines, lasers and cameras are used to detect surface ...
  • Performance of strength grading methods based on fibre orientation and axial resonance frequency applied to Norway spruce (Picea abies L.), Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) and European oak (Quercus petraea (Matt.) Liebl./Quercus robur L.) 
    Article dans une revue avec comité de lecture
    OLSSON, Anders; FAYDI, Younes; OSCARSSON, Jan; ccPOT, Guillaume; ccVIGUIER, Joffrey (Springer Nature (since 2011)/EDP Science (until 2010), 2018)
    Key message Machine strength grading of sawn timber is an important value adding process for the sawmilling industry. By utilizing data of local fibre orientation on timber surfaces, obtained from laser scanning, more ...
  • Traceability and quality assessment of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) logs: the TreeTrace_Douglas database 
    Article dans une revue avec comité de lecture
    ccLONGUETAUD, Fleur; ccPOT, Guillaume; MOTHE, Frédéric; BARTHELEMY, Alexis; DECELLE, Rémi; ccDELCONTE, Florian; GE, Xihe; GUILLAUME, Grégoire; MANCINI, Théo; RAVOAJANAHARY, Tojo; BUTAUD, Jean-Claude; ccCOLLET, Robert; DEBLED-RENNESSON, Isabelle; MARCON, Bertrand; NGO, Phuc; ROUX, Benjamin; ccVIGUIER, Joffrey (Springer Science and Business Media LLC, 2022-11-28)
    The TreeTrace_Douglas database includes images and measurements at several stages of the processing of Douglas fir logs, from sawmill logyard to machine grading and destructive testing of boards, and is suitable for research ...
  • An innovative method based on grain angle measurement to sort veneer and predict mechanical properties of beech laminated veneer lumber 
    Article dans une revue avec comité de lecture
    BOURGEAY, Christophe; ROHUMAA, Anti; DENAUD, Louis; ccPOT, Guillaume; ccVIGUIER, Joffrey (Elsevier, 2018)
    This study proposes an innovative model based on local grain angle measurements to predict the modulus of elasticity of LVL made from beech. It includes a veneers sorting method industrially compatible thanks to its low ...

Browse

All SAMCommunities & CollectionsAuthorsIssue DateCenter / InstitutionThis CollectionAuthorsIssue DateCenter / Institution

Newsletter

Latest newsletterPrevious newsletters

Statistics

Most Popular ItemsStatistics by CountryMost Popular Authors

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales