Theses (Department of Mechanical Engineering)

Állandó link (URI) ehhez a gyűjteményhez

https://hdl.handle.net/2437/360721

Theses collection of the Department of Mechanical Engineering. The collection was started in 2023.

At the University of Debrecen, in accordance with the 2022 amendment to the 2011 Higher Education Act, student theses are only accessible from devices connected to the University's Eduroam WiFi network or from a university IP address.

“The thesis or diploma work of a student who has successfully passed the final examination shall be stored in full in the academic system of the higher education institution, and a record shall be maintained thereof. The stored theses and diploma works – with the exception of parts classified as confidential in accordance with the relevant legislation – must be made accessible and searchable without restriction through the academic system.” Further info on the National Higher Education Act in Hungarian: Felsőokt. tv. (új) - 2011. évi CCIV. törvény a nemzeti felsőoktatásról - Hatályos Jogszabályok Gyűjteménye.

Böngészés

Theses (Department of Mechanical Engineering) Tárgyszó szerinti böngészés "3D printing"

Megjelenítve 1 - 5 (Összesen 5)
  • Nincs kép
    TételKorlátozottan hozzáférhető
    Analysis and Testing of 3D models and infills
    Gillani, Syed Musa Hassan; Balogh, Gábor; DE--Műszaki Kar
    In the thesis work, you will be learning about the general effects of Infills. Measurements of each infill such as the general stress and strain have been calculated. Anycubic Kobra 3D printer and Anycubic 3D PLA filament are used for the tests. Furthermore, each infill in the software Ultimaker Cura has been used. Ever since the start additive manufacturing has faced many problems. Some of them include an overhang layer, materials not bonding together properly, and not enough knowledge of the infills and the effects, such problems affect the print quality and have increased defects. The main purpose of this thesis is to understand the effects of each infill where they can be distributed and used in different objects. This can help us reduce the amount of material we use and, in some cases, infills can also reduce the time taken for something to manufacture. The 3D printing technologies with defined infills and uses can expand easily, and such infills can further be integrated into multiple software and help in part optimization. To understand the effect properly, I designed 2 Tests with different properties. The properties included layer heights, wall layer counts, infill density, and top and bottom layer thicknesses. These properties were changed for the tests and the results were observed for differences. After reducing the layer counts and allowing the infill to have more space in the test sample the results were observed. A tensile testing machine with an integrated optical image camera to measure the accurate strength and strain of the materials was used. The final results were compared and the infill effect. The effect of walls was also observed in each test where reducing the wall count more space was available for the infills and a larger difference with results completely dependent on the infills was observed.
  • Nincs kép
    TételKorlátozottan hozzáférhető
    COMPRESSION TESTING AND ELASTICITY LIMIT CURVE GENERATION OF 3D PRINTED CELLULAR STRUCTURES
    Tahmid, Ahnaf; Balogh, Gábor; DE--Műszaki Kar
    This thesis investigated how different infill patterns and densities affect the compressive behavior of 3D printed Thermoplastic Polyurethane (TPU) structures. The study started with a literature review, followed by detailed chapters covering failure types, sample preparation, compression testing, and result analysis. Common failure modes in 3D printed structures are categorized into mechanical, structural, print quality, and material-specific issues, primarily caused by improper parameters or incompatible designs. These insights guided the accurate preparation of samples in the next phase. Cylindrical specimens were designed according to ASTM D575-91 using SolidWorks and printed using an FDM printer with six different infill patterns and two density levels. In total, 36 samples were tested under compression of 2 mm and 10 mm using the INSTRON 68TM-10 machine. Data such as maximum force, displacement, and dimensional changes were recorded. Stress-strain curves were generated to show how different infill settings impacted compressive strength. Error functions confirmed the consistency of results, supporting repeatability. The study concluded that higher infill densities generally led to greater resistance to deformation, and infill type had a significant effect on mechanical behavior.
  • Nincs kép
    TételKorlátozottan hozzáférhető
    Designing a 3D printer
    Egbi, Daniel Bofa-Okim; Nemes, Dániel; DE--Műszaki Kar
    This thesis investigates the theoretical development of a 3D printer with exceptional accuracy, with a specific emphasis on virtual modelling, simulation, and optimisation methods. The suggested printer is designed to overcome the inherent difficulties of traditional 3D printing, with the goal of achieving unsurpassed precision in the creation of complex three-dimensional objects.The research commences by conducting a thorough examination of current 3D printing technologies, with the aim of identifying their constraints and potential areas for enhancement. Using sophisticated modelling tools, the thesis introduces an innovative conceptual design to improve accuracy and address typical printing problems.In addition, the conceptual design is situated within the wider scope of additive manufacturing, investigating potential uses in several sectors like medicine, aerospace, aviation, and mass customisation. The theoretical framework outlined in this thesis provides a roadmap for future academics and engineers aiming to transform these principles into physical technology.Ultimately, this research introduces an innovative and original blueprint for a 3D printer that achieves exceptional accuracy, thereby paving the way for progress in the field of additive manufacturing. The provided theoretical framework provides a clear plan for practical applications, hence creating new opportunities for precise engineering in three-dimensional printing.
  • Nincs kép
    TételKorlátozottan hozzáférhető
    Designing of Mechanical Prosthetics Using 3D Printing Technology
    Mansour, Ahmed Tarek Mohammed Ibrahim; Erdei, Timotei István; DE--Műszaki Kar
    The main goal of the project was to design a durable, functional, low-cost, mechanical prosthetic finger, as well as investigate various 3D printing technologies and materials to achieve an optimal design at a significantly lower cost than traditional prosthetics. A Finite Element Method (FEM) Analysis was per formed using Ansys to evaluate the mechanical properties of the design. The prosthetic finger was mod elled using Autodesk Fusion and tested in real-life on an individual who tragically lost three fingers in a factory accident.
  • Nincs kép
    TételKorlátozottan hozzáférhető
    Determination of the compressive properties of lattice structures produced by SLA technology
    Umeh, Ugonna Samuel; Mankovits, Tamás; DE--Műszaki Kar
    This study uses compression testing to determine the effect of porosity change on the effective Young’s modulus of lattice structures. Three sets of lattice structures with different porosities were designed and 3D printed. They were then subjected to compressive forces, and their displacement was documented. This data indicated how the effective Young's modulus varied with a change in porosity. Finite element analysis was also employed to see how effectively it predicted material properties.