تعيين برخي خواص فيزيكي و مكانيكي گونه هاي ايراني و لبناني بلوط

Determination of some physical and mechanical properties of two varieties of quercus (Libani and Persica)

In this study, several physical and mechanical properties of Quercus were evaluated as a function of variety. The physical properties of nuts such as dimensional characteristics (length, width and thickness), unit mass and geometrical properties (the geometric mean diameter, volume, surface area and projected area), solid density, bulk density, 1000 seeds mass and porosity differed significantly. To assess mechanical properties samples were loaded between two parallel plates to determine the specific deformation, rupture force and rupture energy and toughness in the rate of loading (31, 54, 75, 200 and 300 mm/min), in the vertical loading side (in the side of diameter) and result showed that amount of rupture force increased with boosting loading rate. In addition concerning statistical analysis on the date integration of variety and loading rate had significant effect (P<0.01) on all mechanical properties. The highest static coefficients of friction were a achieved on rubber surface and the least for aluminum surface