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An Examination Of The Resistance Spot Welding Process Of The Ultra-Hıgh-Strength Steel Wıth Experımental And Numerıcal Methods
(Fen Bilimleri Enstitüsü, 2022)
Since ultra-high-strength steels are being preferred in the automotive industry, the weldability of these steels has been gaining importance. When the scientific literature on the resistance spot weldability of UHSS is ...
Mechanical Material Characterization and Identification of Forming Parameters of Aa2198-T3s1 Aluminum-Lithium Alloy
(Fen Bilimleri Enstitüsü, 2022)
Al-Li (Aluminum-Lithium) alloys have become the focus of the aerospace industry due to their low density and high elasticity modulus, excellent corrosion resistance, high hardness, high fatigue crack growth resistance, and ...
Development of a Gas Turbine Performance Software Including Sub-Idle Region and Starting Process
(Eğitim Bilimleri Enstitüsü, 2022)
This study aims to develop a computer software to mathematically model a gas turbine engine's design point, steady state off-design and starting phases. Having a computer simulation software is crucial for a engine development ...
Influence of Cold Rolling and Subsequent Annealing Processes on the Functional Fatigue Properties of High Temperature NiTiHf Shape Memory Alloys
(Fen Bilimleri Enstitüsü, 2022-06)
Shape memory alloys are very special alloys that can be used as actuators in various applications due to their capability of returning to a prearranged shape via heating under applied load. Their high power per weight ratio ...
Analysıs and Desıgn of A Constant Force Grıpper
(Fen Bilimleri Enstitüsü, 2022)
Constant force mechanisms have significant advantages over conventional force control methods, especially in terms of cost and design complexity. In this thesis a novel constant force gripper mechanism is introduced. This ...
Determining the Effects of Transformation Induced Plasticity and Creep Plasticity on the Functional Fatigue Life of NiTiHf High Temperature Shape Memory Alloys
(Fen Bilimleri Enstitüsü, 2023)
With their high work output during thermal cycling under load, NiTiHf high temperature shape memory alloys became promising candidates for smart actuator design for aerospace industry. However, high temperature applications ...
Crack Propagation During Actuation Cycles of The Nitihf High Temperature Shape Memory Alloys
(Fen Bilimleri Enstitüsü, 2023)
Shape Memory Alloys (SMAs) are very special materials with their distinctive ability to recover their shape change by phase transformation via mechanical and/or thermal stimulations. When the alloy heated above a certain ...
Sensitivity Analysis of Material Parameters on the Micro-Scale Stress Distribution in Fiber Reinforced Composites
(Fen Bilimleri Enstitüsü, 2023)
Knowing the mechanical behavior of fiber-reinforced composites are important since
unidirectional (UD) composite materials have been widely used in many industries.
Different methods in macro-scale and micro-scale have ...
Analysis and Modeling of A Naturally Fragmenting Warhead
(Fen Bilimleri Enstitüsü, 2023)
A naturally fragmenting 81mm mortar round's effectiveness was investigated. During this investigation sustainable new methods were tried. The fragmentation of the round by explosives were examined by tests, modelled ...
Handling Quality Oriented Fault Tolerant Longitudinal Flight Control Algorithm Design For A Jet Trainer Aircraft
(Fen Bilimleri Enstitüsü, 2023)
In the scope of the thesis an alternative longitudinal flight control algorithm, which satisfies predefined stability and performance requirements, in case of a specific fault is aimed for a jet trainer aircraft.
Base ...