The study of the strength of materials printed using additive technology and comparing their properties with the data obtained using the CAE-system

Abstract

The paper presents the results of an experimental study of bending tests of the samples printed by means of additive technology according to various schemes for filling cells and constructing a frame of plates, as well as their positioning on the printer table. It has been found that to increase the strength of the printed material during bending, it is advisable to create mesh layers with large strength properties in the layers of the parts that are opposite to the applied force, since it is the lower layer that undergoes stretchig, while the upper layer is compressed. This conclusion opens up the possibility of creating 3D-printed samples with variable strength properties in certain directions. Test samples were created with the formation of the borders consisting of 1, 2, 3 and 4 threads. The analysis of the experimental data makes it possible to note that the samples having 3 and 4 threads are similar in their strength characteristics. That suggests that for optimal industrial use it is enough to create structures with 2, 3 threads of the boundary shell. The scientific substantiation of the reason for the difference in the strength parameters of the printed material depending on its internal structure and positioning on the printer table was further developed. Based on the results of this work, we can conclude that modelling the strength properties of objects created by 3D-printing is possible, provided that the enterprise creates a library of the correction factors obtained based on the analysis of statistical information. In Ukraine, additive technologies are not yet the subject of the first choice. Therefore, the development at the Department of Mechanical Engineering Technology of the Priazovsky State Technical University and the manufacture on a 3D-printer of the «Lubricating» Gear part of a cylindrical gearbox is a pioneering solution in the heavy engineering industry. The obtained Implementation Act is the result of the first stage of promising work, for the continuation of which both production stands and engineering training, which includes the widespread use of CAE-systems, are necessary. It should be noted that even high-level, generally accessible CAE-systems do not yet have separate applications for working with the parts created using additive technology, which creates the need to create user-developed macros for this purpose