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Showing 1 to 20 of 95 for “"fatigue resistance"”.
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Fatigue Resistance of Prestressed Concrete Beams
Made available in DSpace on 2014-12-13T19:31:47Z (GMT). No. of bitstreams: 1 7913440.pdf: 5005051 bytes, checksum: c139856fd175e8209a3abe2501fdef60 (MD5) Previous issue date: 1978
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An Analysis of the Fatigue Resistance of Beta Titanium and the Effect of Spot-Welding Upon the Fatigue Resistance of this Alloy
This investigation was designed to establish a fatigue curve for beta titanium, determine the effect of spot-welding upon the fatigue resistance of this alloy, and provide qualitative observations about surface characteristics of different batches of TMA in relation to their fatigue lives. …
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Evaluation of rolling contact fatigue resistance for coated components
… and machines for testing rolling contact fatigue failure resistance and load capacity of coated components. The thesis investigates both normal and accelerated rolling contact fatigue evaluation test mechanisms and their models, and evaluation test technique principles suitable to the …
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A Comparative Study of the Fatigue Resistance of Four Orthodontic Alloys
This investigation was designed to compare the fatigue resistance of four orthodontic alloys and to determine whether their surface characteristics had any influence on their fatigue lives. Stainless steel, Blue Elgiloy, TMA, and Nitinol were evaluated using a round (.018") and a rectangular (.016" …
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Effect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloys
… strength to weight ratio, exceptional corrosion resistance and high melting point. In this research the titanium alloy that was focused on is the Ti-6Al-4V (by weight) alloy. With these good properties the alloys are also susceptible to poor tribological property behaviour. Surface engineering …
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Hydrogen degradation and microstructural effects of the near-threshold fatigue resistance of pressure vessel steels
… as in thick section weldments affect the fatigue resistance of the structure. At low stress intensities near-threshold [delta]K₀ ([delta]K = Kmax - Kmin), water vapor in the environment was found to produce a pronounced effect on the fatigue resistance for partial pressures as low as 10 …
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The Effect of High RAP and High Asphalt Binder Content on the Dynamic Modulus and Fatigue Resistance of Asphalt Concrete
… binder contents on the dynamic modulus and fatigue resistance of asphalt concrete. Two RAP percentages (20% and 40%) and three binder percentages (plant-mixed, plant-mixed + 0.5%, and plant-mixed + 1.0%) were evaluated. A Superpave gyratory compactor and an asphalt vibratory compactor were …
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A Fatigue Life Prediction Method for Tensile-Shear Spot Welds
… model has been developed which predicts the fatigue resistance of tensile-shear spot welds under constant amplitude loading test. The TSIP model consists of Stage I--fatigue crack initiation and early growth, Stage II--through sheet thickness crack propagation, and Stage III--across sheet …
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Post-Injection Welded Joint Fatigue Tests of Sandwich Plate System Panels
… welded joints were tested to determine fatigue resistance and the effects of cyclic loading on the localized debonding of the heat affected zone at the post-injection welded joint of a SPS bridge deck. Seven panels containing one of three post-injection weld configurations were …
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Durability of Polymer /Metal Interfaces Under Cyclic Loading
… of loading mode and frequency were studied. The fatigue resistance was found to increase with the mode II component and was expressed as a function of the KII/K I ratio. A strong frequency effect was observed for the subcritical crack growth along the Al/Epoxy interface, their fatigue resistance …
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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 …
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Modelling of transformations during induction hardening and tempering
… in particular to enhance the wear and contact-fatigue resistance of rubbing surfaces. (Part)
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Modeling Fatigue Behavior of 3D Printed Titanium Alloys
… of the crack formation this phenomenon is called fatigue. Fatigue properties are critical for structures subject to cyclic load; hence fatigue analysis is used to predict the life of the material. Fatigue analysis plays an important role in optimizing the design of the 3D printed material and …
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Different Motions of Rotary Instruments
… reciprocating technique which allows for lowered fatigue resistance, lowered compressive and tensile stress; improving the predictability and effectiveness of endodontic treatment
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A Feasiblity Study on the Fatigue Performance of Laser Beam Welds and Hybrid-Laser Arc Welds Used in an Innovative Modular Steel Sandwich Panel Bridge Deck SyStem
… time, and automated mass production. The lack of fatigue data for the laser "stake" welds used to create the enclosed sandwich panel geometry raised concerns with respect to fatigue life. The primary focus of this study was to determine whether or not infinite fatigue life was possible. Two …
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A Laboratory Study on the Effect of High Rap and High Asphalt Binder Content on the Performance of Asphalt Concrete
… on three criteria: stiffness (dynamic modulus), fatigue resistance (flexural beam), and rutting resistance (flow number). Results showed that a 0.5% increase in binder content improved both the fatigue and rutting resistance of the 0% and 20% RAP mixes with only slight decreases in dynamic …
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Nitriding of aluminium-containing steels
… layer. The effect of process variables on the fatigue resistance of nitrided steel has been investigated. Specimens of "Nitralloy" En41A have been gas nitrided under controlled conditions to produce steep and shallow case-hardness profiles with and without white layer. The resultant fatigue …
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Development of a functional neuromuscular stimulation (FNS) muscle training program to prepare paraplegics for standing
… shown improvement in quadriceps muscle strength, fatigue resistance and muscle bulk to varying degrees - according to their individual circumstances. The tetraplegics responded in a different manner to that of the paraplegics. The muscle strength increased significantly by a mean (+SD) of 97,8 + …
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The Competing Roles of Microstructure and Flaw Size on the Fatigue Limit of Metals
… of an analytical model that addresses the fatigue process, namely the threshold condition of non-propagating cracks. Two parameters are identified to govern the fatigue resistance: non-propagating crack size and crack barrier strength. The concept of three defect types associated with three …
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Microstructural modelling of fatigue in layered bearing architectures
… changing engine loads, these bearings may suffer fatigue damage during service. In modern multilayered bearing designs, fatigue resistance is a complex function of engine loading coupled with the layer architecture and a multiphase lining alloy. This research has mostly focussed upon micro-scale …
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