Thesis defense by Rémy Frayssinhes

December 8

Arts et Métiers Campus Arts et Métiers Cluny

Research

Remy Frayssinhes, a doctoral student atLaBoMaP, will defend his thesis on Tuesday, December 8, 2020, on "theoptimization of Douglas fir peeling parameterst mmodeling of the mechanical properties of LVL panels incorporating silvicultural data."

Members of the jury

Rapporteurs:

Ms. Sandrine BARDET, Associate Professor (HDR), LMGC, Montpellier

Mr. Jean-Michel LEBAN, Research Director, INRAE, Nancy

Examiners

Mr. Laurent BLERON, Professor, ENSTIB, University of Lorraine

Ms. Évelyne TOUSSAINT, Professor, Pascal Institute, Clermont Auvergne University

Mr. Robert COLLET, Associate Professor (HDR), LaBoMaP, Arts et Métiers

Mr. Stéphane GIRARDON, Senior Lecturer, LaBoMaP, Arts et Métiers

Guests

Ms. Christine DELEUZE, Doctor, ONF, Dole

Mr. Louis DENAUD, Associate Professor (HDR), LaBoMaP, Arts et Métiers

Summary

Douglas fir was introduced on a large scale in mainland France around 50years years ago. The proportion of large timber will increase in the coming years as the stands age. Part of this resource will not meet the supply requirements of the largest sawmills and will depreciate in value. A wood processing method well suited to the utilization of this resource is peeling. In France, Douglas fir is not a peeled species due to its recent maturity. Veneers can be used to make plywood panels, but also LVL. A study of the optimal peeling parameters was necessary in order to obtain high-quality veneers. Next, a model taking into account the silvicultural data of a stand was developed to estimate the mechanical properties of LVL beams. It made it possible to predict the mechanical properties of beams made from trees from three plots with "contrasting" silvicultural itineraries. A simulation of pruning these trees at 20 years of age shows the value of using this decision-making tool for forest stand management.