Modelling mechanical properties of spruce and Douglas fir timber by means of X-ray and grain angle measurements for strength grading purpose
Article dans une revue 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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Traceability and quality assessment of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) logs: the TreeTrace_Douglas database Article dans une revue avec comité de lectureLONGUETAUD, Fleur; POT, Guillaume; MOTHE, Frédéric; BARTHELEMY, Alexis; DECELLE, Rémi; DELCONTE, Florian; GE, Xihe; GUILLAUME, Grégoire; MANCINI, Théo; RAVOAJANAHARY, Tojo; BUTAUD, Jean-Claude; COLLET, Robert; DEBLED-RENNESSON, Isabelle; MARCON, Bertrand; NGO, Phuc; ROUX, Benjamin; VIGUIER, 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 ...
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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 lectureOLSSON, Anders; POT, Guillaume; VIGUIER, Joffrey; FAYDI, Younes; OSCARSSON, Jan (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 ...
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