On the Issue of Determining the Modulus of Elasticity of Bamboo Moso Under Tension

Abstract

Introduction. A large number of works devoted to the research of physical and mechanical properties of bamboos, methods of nodal connections of bamboo rods are indicated. The main "bamboo" countries in which bamboo is gaining popularity as a structural material in the modern construction industry are listed. With the development of modern processing technologies, bamboo is widely used in the construction industry, including in the manufacture of slabs and boards, as well as in the decoration and interior decoration of rooms in Oriental style. The results of studies of the physical and mechanical properties of various types of bamboos conducted by scientists from different countries are currently combined into three ISO editions concerning building codes and rules for the use of bamboos in construction.Materials and Methods. Consideration of the macrostructure of bamboo allows us to characterize the high mechanical properties inherent in natural and artificial polymers. Such an approach to the consideration of bamboo and wood as natural polymers makes it possible to use methods applied to the testing of wood and structural plastics in determining the mechanical characteristics of bamboo. Two series of samples of five pieces each were made. Tables of geometric characteristics of the cross-section of the samples are compiled. A constructive solution is proposed related to the reinforcement of the sample blades with an epoxy composition in order to increase the reliability of securing the samples in the grips of the test rig.Results. To determine the elastic modulus of bamboo under tension, an experimental setup consisting of two grips in which the test sample is placed has been developed and manufactured. Through the lower gripper, the test load is applied by means of a steel rod with a loading platform on which the calibrated piece loads are stacked. To determine the magnitude of the absolute elongation of the sample base during stretching, contact deflection meters are used, as which watchtype indicators of the Mitutoyo company (Japan) are used.Discussion and Conclusion. The formula for determining the elastic modulus under tension is given. The arithmetic mean of the modulus of elasticity of the tested samples and the mean square deviation of the results of the modulus of elasticity are taken as the test result. The analysis of the obtained results allows us to conclude that the experimental values of the modulus of elasticity of Moso bamboo under tension reliably coincide with the values known in the technical literature.