Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 79 for “"fatigue failure"”.
-
The Mechanism of Fatigue Failure in Concrete
Made available in DSpace on 2014-12-04T23:11:01Z (GMT). No. of bitstreams: 1 6100178.pdf: 6021355 bytes, checksum: 82cd1c17e7fd89025058abb8e8d581c6 (MD5) Previous issue date: 1960
-
Multiscale characterization of thermoacoustic response and fatigue failure of aerospace structures
… in recent decades as it has been seen to induce failure of thin aerospace panels in modes that had not been previously accounted for. These new and unaccounted for failure modes are attributed to the extreme and coupled loading conditions of the thermoacoustic environment prevalent in hypersonic …
-
Development of a vibration fatigue failure prediction model for automotive lamps made of polymers
… for numerically modelling and predicting the fatigue life of automotive lamps made of thermoplastic polymers. The primary aim is to use the fatigue failure prediction technique developed in this research to address fatigue challenges in the design of automotive lamps. The research combined …
-
Laboratory investigation of fatigue endurance limits in asphalt concrete
… a threshold of strain value below which no fatigue damage occurs. This concept is known as the fatigue endurance limit (FEL). Although previous studies have shown that an endurance limit does exist for HMA mixtures, an established value is yet to be determined, with values varying from …
-
The fatigue ageing of vulcanised rubbers
The cause of the respective rough and smooth fatigue failure surfaces of Neoprene GS : Neoprene W and Neoprene GS : natural rubber vulcanisates is investigated. The contrasting morphology of the vulcanisates is found to be the major factor determining the fatigue behaviour of the blends. Neoprene …
-
Development of interactive computer programs for mechanical engineering design: fatigue analysis, section properties, and beam analysis
… programs for mechanical engineering design: Fatigue Analysis, Section Properties, and Beam Analysis. The Fatigue Analysis program sizes up a mechanical component, circular, rectangular, or any shape, to prevent fatigue failure. Six most generally accepted fatigue failure lines are available …
-
The fatigue performance assessment of corrosion damaged RC beams, patch repaired and externally strengthened using CFRP
… to provide an in depth investigation towards the fatigue performance of Carbon Fiber Reinforced Polymers (CFRP) which were externally bonded onto concrete beams as a repair and strengthening technique for internally corrosion damaged RC beams. It was identified that more research concerning the …
-
Modelling of solder interconnection’s performance in photovoltaic modules for reliability prediction
… concern. The key challenge has been the untimely fatigue failure of solder interconnections of solar cells in the modules due to accelerated thermo-mechanical degradation. The goal of this research is to provide adequate information for proper design of solar cell solder joint against fatigue …
-
Aerodynamic response of turbomachinery blade rows to convecting density wakes
… 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 compressible …
-
Investigation into the cause of pneumatic actuator failure on the HypoSurface
An investigation into the failure of pneumatic actuators on the HypoSurface was conducted to provide information on the current HypoSurface prototype. Using a systematic approach throughout testing, piston components were found to have been subjected to fatigue-failure, causing pressure leaks from …
-
Failure modes of silicon nitride rolling elements with ring crack defects
… influence and the fundamental mechanism of the failures they cause. The purpose of this study is to examine the contact fatigue failure modes of silicon nitride rolling elements with surface ring crack defects. In this study, new experimental and computational techniques are developed to measure …
-
Vibration Analysis of a Fan/Compressor Blade
… 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 analytical …
-
Damping acoustic pressure pulsations in pipelines using Helmholtz resonators
… vibrations, increased fretting wear, and even fatigue failure. In this thesis, an acoustic damping device known as the Helmholtz resonator (HR) is experimentally studied. The effects of HR cavity volume, pipeline diameter, HR location, the use of multiple HRs, and mean flow velocity are …
-
Industrial Scalable Rolling Element Bearing Diagnostic and Prognostic Modelling
… to this, they can be prone to rolling contact fatigue failure, especially in industrial applications such as wind turbines and both commercial and military aircraft. The following thesis extends published diagnostic models for bearing condition through inline wear debris sensors through …
-
Damage accumulation of bovine bone under variable amplitude loads.
… a painful injury, are caused by excessive fatigue in bone. This study into damage accumulation in bone sought to determine if the Palmgren-Miner rule (PMR), a well-known linear damage accumulation hypothesis, is predictive of fatigue failure in bone. An electromagnetic shaker apparatus was …
-
Physics-Informed Diagnostic and Prognostic Models for Rolling Element Bearings Using Oil Debris Data
… bearings are susceptible to rolling contact fatigue failure. This poses challenges in industrial applications like wind turbines and aircraft. To address this challenge, the thesis constructs diagnostic and prognostic models due to spalling in the inner raceway. This is achieved by …
-
Passive damping mechanism of Herschel-Quincke tubes for pressure pulsations in piping systems
… loads on inline equipment which may cause fatigue failure and in severe cases, initiate a phenomenon known as acoustic resonance. Passive damping devices such as the Herschel-Quincke (HQ) Tube can be implemented into a resonant system to mitigate the pressure pulsations. Some practical …
-
Damage accumulation of bovine bone under chaotic and variable amplitude loading.
… space warping (PSW) could be used to predict fatigue failure of bone tissue. In this study, three different experimental set-ups were utilized. The Moon's Beam experimental set-up was used to test chaotic loading conditions. The variable amplitude set-up was utilized to test variable amplitude …
-
Damage accumulation of bovine bone under chaotic loading.
… (PSW) could be used as a prediction method for fatigue failure in bone tissue. In this study the Moon's beam experimental set-up was used to perform fatigue tests on bovine bone specimens. Scanning electron microscopy was used to evaluate the fracture surface and identify the fracture type. It …
Page 1 of 4