RESISTANCE TO BENDING OF 3D PRINTED PRODUCTS REINFORCED WITH CONTINUOUS CARBON FIBER

The use of additive technologies in the production of parts for drone aircrafts has a number of advantages. Modern research confirms the need for mandatory verification of the strength properties of UAV components produced using additive manufacturing. This paper presents the results of tests for static bending of composite products obtained on Stereotech Fiber 530 V5 additive installations using three- and five-axis volumetric printing with continuous fiber reinforcement. To study the behavior of reinforced samples under the combined action of bending and interlaminar shear, static bending tests were performed in accordance with State Standard R 56810-2015. Seven groups of samples with different layer arrangements and reinforcement structures with PA6 thermoplastic in the form of a matrix material and reinforcement with Contifiber CPA filament based on Umatex UMT42S-3K filament were produced for testing. Different amounts of reinforcing filament were used for reinforcement. The samples were tested on a universal machine TRM-S 10 A1 with a device for testing three-point bending. The calculated values of the following strength indicators are given: tensile yield strength, interlaminar shear strength, flexural modulus of elasticity and interlaminar shear modulus. Diagrams of sample application of load during static bending tests are presented. It has been proved that the five-axis technology of additive manufacturing of reinforced products makes it possible to achieve an increase in the tensile strength under static bending from 1,5 to 2,5 times and a shear modulus from 2 to 4 times for products manufactured using the technology of five-axis printing with continuous fiber reinforcement of 10...20 % of the volume, compared with non-reinforced printed products and printed products reinforced by traditional three-axis technology.