Détermination des propriétés élastiques d'éléments individuels du plan ligneux du chêne par des essais de traction sur micro-éprouvettes

Abstract

Determination of the elastic properties using tensile tests on micro-samples for different anatomical elements for oak. This work proposes elastic values measured in the cross section of wood for different anatomical elements of oak. The experi- mental device, conceived and developed in our laboratory, allows the Young's modulus and Poisson's ratio to be determined on very small samples. In this work, four components of the anatomical pattern have been differentiated. The corresponding micro samples have been prepared by careful polishing, which is difficult at best. Finally, we are able to propose values for ray cells, longitudinal parenchyma cells, initial ring porous zone and fibres. The ray cells depict the highest rigidity in the transverse plane. On the contrary, the ring porous zone is the weakest, with a value almost ten times less important. Fibres and longitudinal parenchyma cells exhibit average values. The later only seem to present a high anisotropy ratio (E a 2). (© Inra/Elsevier, Paris.)