COST E 53 Conference- Quality Control for Wood and Wood Products

Methods based on propagation of stress waves phenomena indicate particular usefulness in diagnosis and assortmentation of raw material. It has been demonstrated that ultrasonic measurements made both on sawn timber and on standing trees produce satisfactory results in predicting certain mechanical properties of sawn timber obtained from the analysed raw material. The highest correlation has been observed between the velocity of ultrasounds along trunks and the modulus of elasticity of sawn timber obtained from them. A similar correlation with the bending strength has also been satisfactory. To ensure the correct interpretation of the results, it is recommended that studies should be conducted to detect and locate inner rot in standing tree trunks. The studies can be performed by taking measurements of ultrasonic wave propagation transversely in trunks in a potentially defected area and an area free from defects