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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 46 for “"High Cycle Fatigue"”.
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Lead-free solders for high-reliability applications: high-cycle fatigue studies
… method for testing small, model solder joints in high-cycle fatigue. The tests are conducted using common equipment yet provide fast results and objective comparisons between solders without the influence of PCBs or components, which typically obscure the solders’ intrinsic contribution. S-N …
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High-cycle fatigue / low-cycle fatigue interactions in Ti-6Al-4V
… gas turbine engines has been attributed to high cycle fatigue (HCF). Additionally, both high-cycle fatigue (HCF) and lowcycle fatigue (LCF) loadings are widely recognized as unavoidable during operation of these components and because the classic Linear Damage Rule (LDR) neglects to account …
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An investigation of the high cycle fatigue behavior of bovine trabecular bone
Fractures can be caused by fatigue loading due to prolonged exercise and age-related fragility. Fatigue loading causes microdamage in bone that leads to both a loss of stiffness and strength. Some engineering materials, such as steels, have a fatigue limit, which is represented by a stress plateau …
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Characterization of high cycle fatigue and laser-aided machining and polishing of additively manufactured materials
… process integrated with an AM system offers a high processing rate, minimum heat-affected zone, and easily adjustable process parameters during machining and polishing. In mechanical properties characterization of AM metals and alloys, fatigue is a vitally important test method to understand …
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High Cycle Fatigue Simulation using Extended Space-Time Finite Element Method Coupled with Continuum Damage Mechanics
High cycle fatigue (HCF) is a failure mechanism that dominates the design for many engineering components and structures. Surface treatments such as laser shock peening (LSP), ultrasonic nanocrystal surface modification (UNSM) and many others introduce significant residual stresses in the material, …
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Processing effects on the high cycle fatigue life of weld repaired cast Ti-6A1-4V parts
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1981.
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A combined analytical, numerical and experimental technique for investigating stress-singularity effects on Very High Cycle Fatigue of adhesive joints
L'abstract è presente nell'allegato / the abstract is in the attachment
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EFFECTS OF LASER MACHINING ON STRUCTURE AND FATIGUE OF 316LVM BIOMEDICAL WIRES
… tension, and in cyclic strain-controlled fatigue with the use of a flex tester operated to provide fully reversed bending fatigue. All the fatigue testing was conducted in air over a range of cyclic strains to determine both the high-cycle and low-cycle fatigue regimes. The effects of …
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Fatigue Damage and Small Crack Growth During Biaxial Loading
The progressive nature of fatigue damage under biaxial loading has been investigated. Experiments were performed on thin-wall tubular specimens of 1045 steel in tension, torsion, and combined tension-torsion loading. Two equivalent strain amplitudes, one in the high cycle fatigue (HCF) region and …
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Aerodynamic response of turbomachinery blade rows to convecting density wakes
… recently identified as a possible new source for high cycle fatigue failure in the compressor blades of modern turbomachinery. In order to characterize the density wake induced force and moment fluctuations in compressor blades a two-dimensional computational study has been conducted in viscous …
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Microstructure modification for improved mechanical properties in A356 Al using friction stir processing
… second paper examines the influence of FSP on high cycle fatigue behavior of A356. The third paper examines the influence of processing parameters on process loads, temperature, microstructure and the corresponding static mechanical properties. The fourth and final paper deals with crack growth …
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Nonproportional biaxial fatigue of welded joints
The proportional and nonproportional high-cycle fatigue behavior of mild-steel, tube-to-plate welded specimens was studied. In-phase bending and torsion, constant-amplitude fatigue tests were used to define the weldment baseline material properties and also to serve as a comparison with …
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Vibration Analysis of a Fan/Compressor Blade
… last decade because of its significant impact on high cycle fatigue failure due to resonant vibrations. The main objective of this thesis is the vibration analysis of compressor/fan blade using three-dimensional finite element analysis together with various analytical approaches. First, the …
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Development of a generalized fatigue assessment approach for steel castings.
… of this project was to develop a generalized fatigue assessment approach for steel castings for a range of internal casting quality details. In particular, this project examined the effect of quality details on the fatigue performance of steel castings using linear elastic fracture mechanics …
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Design of a Total Pressure Distortion Generator for Aircraft Engine Testing
… including lowering the surge limit and creating High Cycle Fatigue incidents. In order to create a distorted flow with dynamic characteristics, a mechanism must be developed that when actuated, can change the distortion pattern and intensity with respect to time. This work covers the initial …
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Plasticity of γ-TiAl alloys
… in turbine stages of aero-engines, as well as in high performance automobiles and potentially the nuclear industry. The lack of toughness of its two constitutive intermetallic phases, γ-TiAl and α2-Ti3Al, prevents a conventional damage tolerant approach to fatigue lifing. To gain confidence in the …
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Micro Electrostatic Actuation of a Silicon Diaphragm
… with relatively low maximum stresses to ensure a high cycle fatigue life. With these requirements, initial calculations and FEA (finite element analysis) were performed to establish the optimal square diaphragm side length combined with an attainable gap between electrodes to achieve an audible …
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Radial-turbine mistuning
… modes of the diesel engine turbochargers is high-cycle fatigue of the turbine-wheel blades. Mistuning of the blades due to the casting process is believed to contribute to this failure mode. A laser vibrometer is used to characterize mistuning for a population of turbine wheels through the …
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A study of fretting fatigue in aircraft components
… approaches to the problem of fretting fatigue in materials systems relevant to aircraft components. The basic contact mechanics for fretting fatigue in a sphere-plane contact geometry are reviewed. Various elastic criteria for predicting fretting failure are discussed; selected fretting …
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