Master Degree / Yüksek Lisans Tezleri

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  • Master Thesis
    Design of Composite-Based Leaf Spring Systems for Automotive Sector
    (Izmir Institute of Technology, 2013) Öztoprak, Nahit; Tanoğlu, Metin; Tanoğlu, Metin; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    The applications of fiber reinforced polymeric composites in several engineering fields such as automotive, aviation, defense industry and marine are observed vastly nowadays. Especially in the automotive industry, the necessity of the reduction of fuel consumption and CO2 emission has entailed the utilization of the composite materials to provide weight reduction without sacrificing any material strength. Conventional steel leaf springs are components significantly affecting the weight of the vehicle as well as providing ride comfort and vehicle stability. Hence, fiber reinforced polymeric composites having many outstanding properties such as low density, high strength, corrosion resistance, high fatigue life, high wear resistance, are convenient materials for these types of applications. In this thesis, three different composite-based mono leaf springs were designed and analyzed. It was inferred from the analyses that 0° unidirectional glass fiber system hasn’t generated the intended spring rate accurately. Consequently, alternating configurations of the glass and carbon hybrid systems were studied. It was deduced from the studies that material configuration of [0°6G/0°2C/0°22G]S was generated the intended spring rate. Three different composite-based mono leaf springs including indicated material configurations were fabricated within the thesis study. Manufactured prototypes were also tested by using leaf spring test rig for determining the behavior of the prototypes experimentally. The obtained results were compared with FEA and it has been observed that the results are in compliance.
  • Master Thesis
    Development of Process Techniques for Composite Based Leaf Spring Systems
    (Izmir Institute of Technology, 2013) Güneş, Mehmet Deniz; Tanoğlu, Metin; Tanoğlu, Metin; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Fiber reinforced composites have been utilized in automotive industry due to their superior mechanical performance and lower density as compared to conventional metallic materials. Leaf spring systems are the important parts of the automobiles, which effects the weight of the vehicle in addition to driving performance and security. In this study, composite based leaf spring systems were developed, manufactured and characterized. Five different types of composite plates were manufactured with three different types of reinforcing material via resin transfer molding process and characterized in order to select the proper composite material for spring applications and design the composite leaf spring prototypes. Glass fiber reinforced epoxy, carbon fiber reinforced epoxy and glass/carbon hybrid fiber reinforced epoxy composite plates having unidirectional and [0o/90o] biaxial stacking sequences were fabricated. Tensile, flexural and thermo-mechanical properties of composite plates were determined within the study. Test results showed that unidirectional glass fiber reinforced epoxy composites are the most suitable materials for spring applications due to their higher strain energy capability as compared to carbon and hybrid fiber reinforced epoxy composites. Composite leaf spring prototypes were manufactured based on two geometrical design by resin transfer molding procedure. Three different types of leaf spring prototypes with various fiber configuration were manufactured based on the first geometrical design and characterized by mechanical rig test. Mechanical rig test results showed that composite leaf spring which contains 56 layers of glass fiber and 4 layers of carbon fiber has the most suitable fiber configuration for leaf spring designed based on first geometrical design.