On the Issue of Determining the Tensile Elastic Modulus of Moso Bamboo

Introduction. Numerous works devoted to studying the physical and mechanical properties of bamboo and the methods of bamboo rods’ node connections are identified. The main "bamboo" countries, where bamboo is becoming popular as a structural material in the modern construction industry, are listed. Due to development of the modern processing technologies, bamboo is widely used in the construction industry, including the slab and board manufacture, as well as the decoration and indoor finishing in the oriental style. The results of studying the physical and mechanical properties of various types of bamboo conducted by the scientists from different countries are currently integrated into three ISO standards regulating the rules of bamboo application in construction.

Materials and Methods. Studying the bamboo macrostructure makes it possible to specify the superior mechanical properties attributed to natural and artificial polymers. Such an approach to studying bamboo and wood as natural polymers makes it possible to apply the methods used in testing the wood and engineering plastics to determining the mechanical properties of bamboo. Two sets of specimens each consisting of five items have been produced. The geometric specification tables of the specimens’ cross-sections have been drawn up. A design solution has been proposed to strengthen the head of a specimen with the epoxide compound aiming to improve reliability of fixing a specimen in the test unit grippers.

Results. To determine the bamboo tensile elastic modulus, a test unit consisting of two grippers, into which a test specimen is placed, has been developed and manufactured. Through the lower gripper, the test load has been applied by means of a steel pull rod with a loading platform, on which the calibrated single-piece loads have been put. To determine the magnitude of the absolute elongation of the specimen base in tension, the contact deflectometers, i.e. the Mitutoyo dial gauges (Japan), have been used.

Discussion and Conclusion. The formula for determining the tensile elastic modulus is given. Finding the arithmetic mean value of the tested specimens’ elasticity modulus and the mean square deviation of the elasticity modulus is considered to be the result of the test. The analysis of the obtained results allows us to conclude that the experimental values of the tensile elastic modulus of Moso bamboo validly coincide with the values known in the technical publications. 

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