Theses (Department of Mechanical Engineering)

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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 "Additive Manufacturing"

Megjelenítve 1 - 4 (Összesen 4)
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    TételKorlátozottan hozzáférhető
    Analysis of mechanical response of Ti-6Al-4V lattice structures using finite element method
    Zhang, Haochen; Mankovits, Tamás; DE--Műszaki Kar
    With the advent of the Fourth Industrial Revolution, the demand for lightweight, high- performance materials is increasing across various industries, including aerospace, automotive, construction, and medical bio-implants. These sectors are placing higher demands on the mechanical properties of structural materials. Lightweight materials have become crucial for improving energy efficiency and environmental performance. However, conventional material structures often struggle to meet both lightweight and high-strength requirements. Consequently, the development of innovative lattice structures to enhance material properties has emerged as an important area of research. In this study, we employed the controlled variable method to ensure that different structures were compared under consistent conditions, minimizing the influence of external factors and ensuring the accuracy of the experiments. We first modeled and analyzed four different lattice structures. Finite element analyses were conducted using ANSYS software to evaluate the impact of their fill rates on mechanical properties and identify the most suitable lattice types for multidisciplinary applications. The modeling was executed in ANSYS SpaceClaim, followed by finite element analysis in ANSYS Workbench. A thorough evaluation of stress distribution, strain, and other relevant factors was performed for each generated structure. The analyses aimed to assess how fill rate influences the mechanical properties of the lattice structures in this study. Each of the four designs featured different lattice cell shapes and fill rates, while the length of the lattice structure was kept constant to ensure a valid comparison across all types. For this research, we selected Ti-6Al-4V, the most commonly used material in additive manufacturing. We determined the stress-strain characteristic diagrams for the four types of structures: simple cubic lattice, center-supported lattice, side-crossed-supported lattice, and lateral-diagonal- supported lattice. Additionally, we calculated the effective Young's modulus for each case and performed a comprehensive comparison and analysis of the simulated values. The results revealed significant differences in the mechanical behavior of each lattice structure at various fill rates. We found that the simple cubic lattice and the center-supported lattice are effective for mimicking human cortical bone at low fill rates. In contrast, the lateral cross-supported lattice demonstrates high performance even at a 50% fill rate. This lateral cross-support lattice exhibits a high Young's modulus, making it suitable for high-strength applications, such as metal implants. However, its high modulus of elasticity deviates significantly from the elastic properties of natural bone, which must be considered in biomaterial design. Side-to-side diagonal support lattices showcase excellent stiffness and deformation resistance at high fill rates, rendering them suitable for applications like spinal braces and other support devices. For industrial uses, the lateral cross-support lattice is appropriate for gas turbine fan blades, while the lateral diagonal support lattice is ideal for UAV wing designs at a 70% fill rate, as it combines high stiffness with lightweight requirements. Our findings underscore the varying applicability of different cell structures at various fill rates, providing valuable insights for material design and optimization.
  • Nincs kép
    TételKorlátozottan hozzáférhető
    Design and Additive Manufacturing of a Flat Form Tool
    Rahman, Shahbaz; Bodzás, Sándor; DE--Műszaki Kar
    The focus of this in-depth study is largely on the application of additive manufacturing in the creation of a flat form tool; an integral component utilized in several engineering applications. The study progresses with a holistic approach where each stage lends itself to the more broad-scope objective of reimagining the process of tool production through advancements in 3D printing technologies. Initially, the study embarks upon an in-depth analysis of the flat form tool, from both a constructional and analytical perspective. Essentially, this aspect lays the basis for the forthcoming design stages and the actual production methodologies. Furthermore, this study encircles the creation of CAD models for both the tool and the workpiece. The entire layout procedure enlists sophisticated modelling patterns tailored specifically to enhance precision and maximum functionality to develop models. Thus, paving the path for an efficient production process attuned to accuracy. Following the design phase is the actual operationalization of additive manufacturing of the tool. The Ultimaker 3, 3D printer is pressed into service, using PLA (Polylactic Acid) material, for manufacturing the tool. The Ultimaker Cura Slicer Software has been utilized to transform intricate digital blueprints into precise physical entities, with efficient material usage. Lastly, a finite element analysis (FEA) is performed on the produced tool to gauge its performance amidst operational situations. The results of this evaluation offer vital understanding of the tool’s mechanical idiosyncrasies, thereby aiding the ratification of design selections and corroborating functionalities along with resilience. Overall, this thesis proves conclusively that additive manufacturing holds viability and obvious benefits when it comes to producing tools tailored for unique requirements. Ultimate power of 3D printing in transforming tool production shouldn’t be neglected as it offers flexibility, waste minimization and heightened productivity. The study marks a potential ground breaker in its domain, revealing an all-encompassing mechanism to tool formation and manufacturing. By doing so, this study opens doors to future developments and potential advancements in additive manufacturing application in an extensive spectrum of industries.
  • Nincs kép
    TételKorlátozottan hozzáférhető
    Determination of the working characteristics of additive printed TPU product using finite elements simulation
    Ahmed, Anis; Huri, Dávid; DE--Műszaki Kar
    The thesis explores the determination of the working characteristics of additive printed rubber-like products, a critical factor in the field of additive manufacturing. An overview of various additive manufacturing techniques and the range of rubber-like materials that maybe produced is given. The study revolves around determining the working characteristics and accuracy of the results of Thermoplastic Polyurethane (TPU) printed product. It explores the introduction of hyperelastic material models and explains the curve fitting procedure used to precisely depict these materials' behaviour under various stresses. In order to fully understand how the material responds to different situations, a key component of the study is the process of fitting the parameters of the material model using various datasets of test loads from compression and tension test results. Subsequently, by performing finite elements analysis on a printed TPU product, the study validates the accuracy of the obtained results, guaranteeing the validity and authenticity of the conclusions.
  • Nincs kép
    TételKorlátozottan hozzáférhető
    The Geometric Effect on the Tensile Behaviour of an Additive Printed Material
    Kumar, Jatin; Huri, Dávid; DE--Műszaki Kar
    The present thesis investigates the intricate relationship between geometrical changes and rubber-like materials tensile behaviour. Additive manufacturing technology has made fabrication a different game altogether, affording unbelievable freedoms not only in design but also choice of materials. The use of rubber like materials whose mechanical properties are unique in the field of flexible and resilient materials that provide a systematic way of “unravelling the geometric effect” on tense behaviour hold great potentiality. Using additive manufacturing techniques, many similar shape specimen samples but various geometric configurations was produced. These test samples subject to uniaxial tensile capture the material response to mechanical stresses. The post-processed measurements yielded accurate stress strain curves, elucidating the material behaviour in varying load settings. This study will compare stress, strain curves for samples with different geometry. It encompasses a wide array of geometric variables such as the aspect ratio, curvature, and density of infill. Through this study we are able to detect the complex and sometimes non-linear influence of geometrical parameters in a tensile load of an additively manufactured component. This is the reason why outcomes of such study contribute into deepening our basic knowledge about physical science and highlight the fact of how geometry influences tensile behaviour regarding potential additive manufacturing application. The study constitutes an enabler to enhancing the designs and manufacture process in additive manufacturing. Such an insight is of vital importance for use in areas such as soft-robotics prosthetics and flexible electronics as materials deployed within them need a very high degree of flexibility.