Modelling mechanical properties of spruce and Douglas fir timber by means of X-ray and grain angle measurements for strength grading purpose
TypeArticles dans des revues avec comité de lecture
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 ultrasound methods), static bending stiffness and bending strength of 805 boards of Douglas fir and 437 boards of spruce. This model can be used in an industrial context since it requires low computational time. The results of this study show that the developed model gives better results than the global non-destructive measurements of the elastic modulus commonly used in the industry. It also shows that this improvement is particularly higher in the case of Douglas fir than for spruce. The comparison has been made on both the quality of the mechanical properties assessment and on the improvement of the grading process according to the European standards by using different index.
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VIGUIER, Joffrey; JEHL, Arnaud; COLLET, Robert; BLERON, Laurent; MERIAUDEAU, Fabrice (Taylor & Francis, 2015)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 ...
An innovative method based on grain angle measurement to sort veneer and predict mechanical properties of beech laminated veneer lumber VIGUIER, Joffrey; BOURGEAY, Christophe; ROHUMAA, Anti; POT, Guillaume; DENAUD, Louis (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 ...
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 ...
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.) OLSSON, Anders; POT, Guillaume; VIGUIER, Joffrey; FAYDI, Younes; OSCARSSON, Jan (Springer Nature, 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 ...
The influence of veneer thickness and knot proportion on the mechanical properties of laminated veneer lumber (LVL) made from secondary quality hardwood PURBA, Citra Yanto Ciki; POT, Guillaume; VIGUIER, Joffrey; RUELLE, Julien; DENAUD, Louis (Springer Nature, 2019)The first objective of this work was to study the influence of veneer quality on the mechanical properties of laminated veneer lumber (LVL) made of secondary quality hardwood. The second objective was to propose an adapted ...