EXPERIMENTAL AND STATISTICAL RESEARCH OF SECANT MODULUS OF ELASTICITY OF WOOD DEPENDING ON DURATION OF ITS IMPREGNATION TIME WITH WATER

Abstract

Wood is one of the most important building materials. However, it remains relevant to study its work under different operating conditions. The article is devoted to the study of the modulus of elasticity, depending on the duration time of  wooden samples impregnation with water. The experimental specimens (dimensions 45 mm x 45 mm x 250 mm ) were tested under compression along the fibers. Relative deformations were measured during the test. On the basis of this, the calculation of the secant modulus of elasticity was carried out and the diagrams of its dependence on stresses were constructed. The maximum impregnation time of wood was 5 days and a minimum of 30 minutes. The wet test results were compared to the same dry specimens at a standard moisture content of 12 percent.

The study made it possible to conclude that the wood strength  after 30 minutes of impregnation with water is significantly reduced, and the dependence of the modulus of elasticity on stresses is linear and gradually decreases with increasing time of impregnation.