Abstract
The development of 3D printing technologies has gained considerable momentum. Almost every technical-scientific field uses this technology. The technology of 3D printing thermoplastic materials (or fusible filaments - FFF), is based on the realization of the parts by depositing successive layers of extruded filament at temperatures corresponding to the viscous aggregation state. One of the research activities of the CERAS research center is the realization of collaborative drone systems, drones capable of moving in each of the three unstructured environments: aerial, terrestrial aquatic / underwater. This paper presents a study on the choice of the type of thermoplastic material, for making the structural elements (chassis) of an underwater Rover. The need for this study arose from the fact that the design and construction of underwater vehicles is generally demanding. The materials must be characterized by resistance to compression / stretching / shearing, as in underwater environments the existence of currents, pressures (with increasing depth of immersion). Also, the materials must be chemically neutral, because in aquatic environments we can find various chemicals spilled in water (intentional or not) and finally salinity.
Highlights
The use of fusible filaments is a 3D printing technique [1], which allows the creation of a part of an assembly / subassembly layer by layer, by depositing the melted thermoplastic material through a nozzle
The printing principles [3] show how the dynamics of melt flow and temperature influences the extrusion process and the process of making connections between successive layers of material. These influences are manifested by the way in which the final interface between the "beads" is formed. This distance is responsible for the way in which the layers "stick" to each other, so that the thermo-mechanical characteristics can satisfy the real conditions of movement in an unstructured environment and in which the disturbing elements of the hydrodynamics are random
In order to carry out the tests, it was decided that the test samples will be made of PLA and PETG monofilament with a diameter of 1.75 mm, 4 mm nozzle, the material was removed from the packaging with desiccated before the operation printing [10,14]
Summary
The use of fusible filaments is a 3D printing technique [1], which allows the creation of a part of an assembly / subassembly layer by layer, by depositing the melted thermoplastic material through a nozzle. The printing principles [3] show how the dynamics of melt flow and temperature (printing bed, extruder) influences the extrusion process and the process of making connections between successive layers of material. These influences are manifested by the way in which the final interface between the "beads" is formed. This distance is responsible for the way in which the layers "stick" to each other, so that the thermo-mechanical characteristics can satisfy the real conditions of movement in an unstructured environment and in which the disturbing elements of the hydrodynamics are random
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