PREDICTION OF BENDING PROPERTIES FOR BEECH LUMBER USING STRESS WAVE METHOD

Ergun Guntekin, Serhat Ozkan, Tugba Yilmaz

Abstract


In this study; bending properties of beech wood (Fagus orientalis) were predicted using stress –wave method and compared with static bending tests. First, lumbers which were different in length andcross section were weighed and dimensions were measured. Then, moisture contents were obtained viamoisture meter. By using the density, moisture, and dimensions of the samples in MTG Timber Graderdevice, dynamic modulus of elasticity values were determined. And then, samples were subjected to 3point bending test. Modulus of elasticity and bending strengths were calculated using load – deformationcurves. Regression models were developed to interpret relationships between dynamic modulus elasticityand bending properties. Results showed that there is a high regression coefficient (0,86) between dynamicmodulus of elasticity and static modulus of elasticity. Regression coefficient between dynamic modulusof elasticity and static bending strength was measured as (0,72) and regression coefficient between staticmodulus of elasticity and static bending strength was measured as (0,74). Results indicate that bendingproperties of beech wood lumber can be predicted using stress wave method.

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