ارزيابي تاثير پوسيدگي بر مدول هاي الاستيسيته ديناميكي و الاستيكي چوب گونه راش با استفاده از روش غير مخرب موج تنش

Evaluation of influence of decay on dynamic and static moduli of elasticity in Iranain beech by using of NDT stress wave

The aim of this study was to evaluate sound (control sample) and decayed wood of Iranian beech (Fagus orientalis) with a NDT stress wave method. Sapwood samples, with dimensions of 9 by 19 by 200 mm were decayed in laboratory soil-bed tests, based on European pre-standard ENV-807. The decay was evaluated by measuring percentage of mass loss (W), static modulus of elasticity (MOEs) in three-points bending test and also bending dynamic modulus of elasticity (MOEd) and longitudinal dynamic modulus of elasticity (E