CONCERNING THE RATIO BETWEEN THE ADHESIVE AND MECHANICAL STRENGTH OF BUILDING STRUCTURES – 3D PRINTING PRODUCTS OBTAINED BY FUSED DEPOSITION MODELING OF THERMOPLASTIC MATERIALS

Introduction: 3D printing represents a very promising area in the construction industry. However, the lack of a theoretical framework, which makes it impossible to control the quality of structures obtained, prevents it from being used in mass production. Methods: Adhesion properties largely depending on the cross-section area are one of the most important elements of the technology, which in some cases limit the strength characteristics of a resulting structure. Therefore, it is necessary to know adhesive strength characteristics (besides mechanical ones) of items manufactured using this technology. The paper addresses strength characteristics of a joint between the layers of the extruded material when a structure is manufactured by 3D printing. The authors experimentally determine a dependency of the ratio between the adhesive and mechanical strength on the layer printing time. Results: The practical result of the study is in the revealing of a general relationship in 3D printing both in the area under consideration and in the construction field, and the improvement of the theoretical framework for further development of the technology in the construction industry.