Improving strength grading of lumber by grain angle measurement and mechanical modeling
TypeArticles dans des revues avec comité de lecture
Timber strength grading has become a major issue in the European Union during the last years, due to the introduction of the Eurocode 5 and all its related standards. Currently, the most performing strength grading machines are able to locally detect the boards’ knots sizes and positions and interpret this information through adapted grading models. The best lead to improve their accuracy seems to be the introduction of new information about the boards and adapt the mechanical model to take them in account. Small grain angle causes high reduction of clear wood’s mechanical properties, local value of slope of grain appears to be of high interest. The aim of this study is to quantify the additionalaccuracy that grain angle information can bring toan optical scanner used as a strength grading machine. A specific grading model has been developed accordingly, and the results obtained for different machine / model / loading combinations are presented. These results show that slope of grain measurement can significantly improve the accuracy of the optical scanner, for both MOE and MOR estimations.
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Modelling mechanical properties of spruce and Douglas fir timber by means of X-ray and grain angle measurements for strength grading purpose VIGUIER, Joffrey; BOURREAU, Damien; BOCQUET, Jean-François; POT, Guillaume; BLERON, Laurent; LANVIN, Jean-Denis (Springer, 2017)This study proposes a model using data from a scanner (X-ray and grain angle measurements) to perform strength grading. The research also includes global measurements of modulus of elasticity (obtained by vibrations and ...
BESSEAU, Benoît; POT, Guillaume; COLLET, Robert; VIGUIER, Joffrey (2019)Scanner measurements allow knot detection and machine strength grading on sawn timber, which answers the construction and sawmilling industry needs at high production rates. In particular, laser scanners measure fiber ...
Assessment of the error of fiber orientation measurement obtained by laser scanning on several European hardwood and softwood species BESSEAU, Benoît; POT, Guillaume; VIGUIER, Joffrey; COLLET, Robert (CompWood 2019 Conference, 2019)Scanner measurements allow knot detection and machine strength grading on sawn timber. In particular, laser scanners measure fiber orientation by means of the so-called tracheid effect explained by the fact that the wood ...
Influence of wood anatomy on fiber orientation measurement obtained by laser scanning on five European species BESSEAU, Benoît; POT, Guillaume; COLLET, Robert; VIGUIER, Joffrey (Springer Science and Business Media LLC, 2020)Abstract In order to obtain high production rates of sawn timber, the sawmilling industry can use laser scanning, allowing knot detection and machine strength grading. In particular, laser scanners measure grain angle using ...
Panel Shear of Plywood in Structural Sizes - Assessment Improvement Using Digital Image Correlation VIGUIER, Joffrey; MARCON, Bertrand; BUTAUD, Jean-Claude; DENAUD, Louis; COLLET, Robert (Springer Science and Business Media LLC, 2021)This paper introduces a new test configuration for the determination of panel shear properties in structural sizes. This original test configuration has been successfully applied to calculate the shear properties of beech ...