Yazar "Yavuz, Hakan" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • [ X ]
    Öğe
    Enhancing the tensile properties with minimal mass variation by revealing the effects of parameters in fused filament fabrication process
    (Springer Science and Business Media Deutschland GmbH, 2020) Korkut, Volkan; Yavuz, Hakan
    The Fused Filament Fabrication is a revolutionary method for the manufacturing industry. However, there are still numerous challenges need to be tackled in order to standardize the procedure of printing process. In this study, the process parameters of line width, shell thickness, infill orientation and infill overlap, have been experimentally investigated over their affect on tensile strength properties and the mass of the produced samples. Design of experiments has been planned, conducted and evaluated using the Taguchi approach. A total of 25 combinations of the four printing parameters with five different settings have been set according to the L25 Orthogonal Array table. The sample parts have been printed via widely used type low-cost and open-source 3D printer. Afterwards, the printed samples are tested for their tensile strength. The best combinations of the parameters with relevant settings have been revealed by S/N Ratio analysis. In order to validate the statistical results, the sample with newly found combination has been manufactured. Then, the ANOVA has been applied in order to reveal the percentage contributions of parameters to the tensile behaviour. It has been concluded that infill overlap and orientation parameters are dominant factors over the ultimate tensile strength of the samples. As a widespread effect, generalized equations have been established and presented in order to calculate the occupied area by an overlap. By implementing the equations, the users will be able to configure their input parameters in behalf of increasing the tensile strength while controlling the material consumption. © 2020, The Brazilian Society of Mechanical Sciences and Engineering.
  • [ X ]
    Öğe
    In-Space Additive Manufacturing Based on Metal Droplet Generation Using Drop-on-Demand Technique
    (Springer, 2022) Korkut, Volkan; Yavuz, Hakan
    Metal-based droplet deposition technique is a promising method for obtaining 3D circuits and micro-sized conductive structures. Practically, direct part manufacturing can be achieved via droplet generator systems efficiently. In this study, micro-scale droplets are formed by a vibrated actuator. Furthermore, vibration stroke can be adjusted by means of a precise mechanical restrictor. The effects of the input ejection parameters are investigated over the droplet properties such as diameter, velocity and deposition conditions. The deposition morphologies with different layouts are first classified through theoretical equations. Experiments are then performed to obtain the predicted deposition patterns. As a result, it is observed that the vibration amplitude and voltage directly affect the flight velocity, diameter and wetting characteristic of the droplet, thus the deposition performance. In this context, it has been proven that droplets can be deposited in desired patterns when ejection parameters are properly configured. With such system, metallic structures can be obtained in non-laboratory environments such as space stations and aerospace vehicles those have limited access to the equipment. The presented device is designed to be modifiable, maintainable and compact structure. Given the freedom of design and flexibility in manufacturing, such devices become promising candidates for use in space environments involving different gravitational conditions.
  • [ X ]
    Öğe
    Sustainable metal droplet formation via open-source, cost-effective, and modifiable droplet generator
    (Sage Publications Ltd, 2022) Korkut, Volkan; Yavuz, Hakan
    In this study, a metal droplet generator developed with an open-source concept is presented. The continuous droplet generation process was achieved without inert gas assistance. Owing to this desktop device, which is proposed as an alternative to high-cost metal printing devices, users can achieve stable droplets continuously at low costs. Taking into account the pressure balance inside the melting region, the necessary amount of a metal wire feed was first revealed. The droplets generated which are in good agreement with the theoretical calculations were then ejected via mechanically restricted vibrational impacts. The reproducibility of the system was also tested. The droplet formation stages were classified, and the stable parameter groups were revealed in accordance with the measurements. Moreover, the wire type material feeding issue in metal droplet generators, which were insufficiently studied so far, has also been examined. A dynamic feeder mechanism was introduced in detail. In conclusion, Ball Grid Array deposition and functional circuit printing have been successfully achieved. This study on a continuous metal droplet formation is also important for future studies because the structure of the device is easily accessible and modifiable.