A new test for the characterization of mode II fracture of two species of wood: Thuja and Eucalyptus Grandis

摘要

Shear strength (Mode II fracture) is one of the properties often used to describe a wood species for its exploitation in the industry. But until then there is no standardized test that can explain this phenomenon. In our work, we adopted a new approach to study the behavior of wood material subjected to mode II of rupture, to be done, we conceived and realized a new prototype of taste, of the wood which we tested within our laboratory where we have been able to observe that the propagation of the crack in our case is stable, which gives rise to an evaluation of the rupture until separation by shearing of the specimen in the single longitudinal plane. A series of tests were carried out on two species, Thuja (Tetraclinis Articulata (Vahl) Masters) and Eucalyptus Grandis as test material to obtain the typical recording of the displacement displacement curve, which allowed us to determine one parameter considered important in the linear mechanism of rupture (MLR): The strain energy release rate that by using the criterion of IRWIN KIES as well as the method of complaisance.