Relation between the growth stress of indicator and the breaking strength of the wood Moroccan

Abstract

The liberation of the growth stress during the cutting down and the cutting into sections prevents the use of increased wood of Eucalyptus and the Quercus ilex as wood of work. The operations of first transformation modify the mechanical balance and provoke afterward fissuring in the form of cracks in end of grapes. The importance of the fissuring, which in connection with the mean value of growths stresses indicators (GSI), also depends on both intrinsic properties of the wood; the failure stress has a tensile and the fracture toughness in the distribution of crack. The grown Eucalypti presents a strong nervousness translated by strong values of GSI associated generally to the wooden presence of reaction (wood of tension). The solid wood presents a fragile behavior with failure stress of drive and a fracture toughness of the Quercus ilex more raised than that of grown Eucalypti.