UBC Theses and Dissertations
A model to predict tensile mechanical properties of robot formed wood flakeboard Chen, Guanqi
Compared with solid wood, one of the advantages of wood-based composites is the great potential for the design of material properties through manipulation of manufacturing variables. Large strides are presently being made in the design of non-veneer structural panels such as oriented strand board (OSB) by using material science and engineering principles. Scientists and engineers have been more successful in designing synthetic fiber-reinforced composites than wood-based composites, mainly because of the complexity of the microstructures and the inherent variability of the wood composites. In this study, recent research in modeling and predicting the properties of flakeboards has been summarized. The relationships among the structure in terms of void volume, density distribution, and the properties of the panels are discussed. With the help of a robotic system, very thin partially oriented wood assemblies were made and tested. The relationship between flake orientation and tensile strength and tensile MOE were determined. The relationship between density and tensile strength and tensile MOE were also examined. Based on layer properties, a three-layer mathematical model was derived to predict the tensile strength and tensile MOE. Partially oriented three-layer OSB panels were made and tested to verify this mathematical model. Very good agreement was found between this model and experimental results. Furthermore, a 3D finite element model was developed to simulate the probability of failure and probabilistic distribution of tensile strength of OSB. The probabilistic distributions of tensile strength and the load capacity probabilistic distributions for three-layer partially oriented OSB were predicted successfully. Good agreement between predictions and experimental data was observed.
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