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Analytical modelling of chip formation during beech green wood rotary veneer cutting process

Vincent Bonin 
Abstract : Rotary veneer cutting is a green wood orthogonal cutting process whose tool tip is parallel to the fibre. Moreover, the wood chip is the final product. The present stake is to determine the peeling ability of French Douglas or lesser known species of the Guyana forest without numerous peeling experiments. In order to reach this goal, a modelling of the process had to be developed in spite of the present scientific problem of the green wood behaviour during rotary veneer cutting process, as it is characterised by a high strain rate and, complex and large strains mixing both compression and shearing. To understand these physical phenomena , more than 700 quasi-static traction, compression and torsion tests were carried out with different kinds of loadings. Moreover, about one hundred rotary veneer cutting tests were performed on an experimental micro-lathe in which we developed a thermic measure. We propose an analytical modelling which is appropriate to describe the cutting steady state. The strain zone description is lagrangian and the determination is solved by the process powers. We propose an isotropic and compactable hyper-elastic behaviour law of fourth order generalised Rivlin whose form is determined by the quasi-static tests and the coefficients value by a Levemberg-Marquardt inverse method in order to take into account the strain rate. For the first time, it possible to predict the strain zone slope angle which is so particular in the experiments. Moreover, at least 75% of the predicted forces are closer than 15% from the experimental ones.
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Submitted on : Friday, January 5, 2007 - 8:00:00 AM
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  • HAL Id : pastel-00002062, version 1



Vincent Bonin. Analytical modelling of chip formation during beech green wood rotary veneer cutting process. Engineering Sciences [physics]. Arts et Métiers ParisTech, 2006. English. ⟨NNT : 2006ENAM0022⟩. ⟨pastel-00002062⟩



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