Analysis of Physical-Mechanical Characteristics and Advantages of Bakelite Plywood as Constructional Material

Waterproof plywood as product of the wood reprocessing has the number of advantages for civil engineering, such as: ability to form curved surface; transportability and possibility of quick erection; relatively large size and similar physical-mechanical properties in lengthwise and crosswise direction; resistance against chemical and biological influence. Bakelite plywood is one of the prospective types of waterproof plywood. The effective introduction of bakelite plywood into civil engineering slows down because of insufficient knowledge of influence of the range of factors on strength and deformability of the bakelite plywood structures. Taking into account the above, the research work is devoted to study physical-mechanical properties of bakelite plywood as orthotropic material. The aim of the research is to obtain the results, which can be used for design of the bakelite plywood structures. Samples with size 30x30x120 mm, made by bonding the required number of 9-layers plywood sheets with the use of phenol formaldehyde glue, were used to determine mechanical-physical characteristics of bakelite plywood. The sheets with thickness of 10 mm were used in the research work. Every sample was tested by sixfold loading and unloading with measurement of deformations in the process of loading. The research results of physical-mechanical properties of bakelite plywood as orthotropic material are shown in the article. They are necessary for practical calculations of tensions in the adhesive joints by methods of elastic theory of anisotropic materials. The possibility of using the obtained research results for practical calculations is shown on the example of the overlapping adhesive joint.