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.
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Showing 1 to 20 of 23 for “"Creep testing"”.
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Impression creep testing within a microstructural gradient
Includes bibliographical references.
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Design and construction of automatic control for creep testing apparatus
Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1944
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Influence of grain size and niobium content on the creep resistance of ferritic stainless steels
… it is necessary that the material offers creep resistance. Type 441 is dual stabilised with Ti and Nb to provide improved weldability; however, Nb addition also enhances the hot strength and creep resistance by means of precipitation and solid solution strengthening. Notwithstanding the Nb …
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Creep and Elevated Temperature Mechanical Properties of 5083 and 6061 Aluminum
… of loading conditions and temperatures. Tensile testing was completed on both materials to measure strength properties of elastic modulus, yield strength, and ultimate strength as well as reduction of area from room temperature to 500 deg C taking measurements every 50 deg C. These tests showed …
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Grain boundaries and creep deformation mechanisms in a high performance nickel-based superalloy
… dissertation is focused on the description of creep deformation in the new Rolls-Royce Alloy 12-1 polycrystalline nickel-based superalloy for disc application in gas turbine engines. In particular, this study aims to progress the understanding of the effect of grain boundaries in relation to …
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The Creep Behaviour of Rubbers Reinforced with Particulate or Short Fibres
Elastic stress-strain testing and (primary and secondary) creep testing have been carried out on unfilled polyurethane rubber and two rubber composites filled with 10 vol% and 20 vol% alumina particulates. They have been run at three different temperatures (20°C, 45°C and 65°C) for all three …
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Surface Orientation Dependent Corrosion Damage and Temperature Dependent Mechanical Property Degradation of Sensitized AA5083-H116 Alloys
… and subsequent mechanical (tension and tensile creep) testing. To connect the laboratory studies to the field exposure, Novelis 5083-H116 was sensitized at 100°C; dog bone samples were created and exposed for two years in a beach environment to investigate possible sensitization and corrosion …
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Assessing Non-Planar Slicing and Carbon Fibre Filament Additives as Steps Towards 3D-Printed Drone Propellers
… parts and viability of printed propellers. Creep testing simulating propeller thrust loading found coupons varied greatly in time to failure, although benefits of carbon-fibre additives were detected. Drop tests assessed impact behaviour, finding no link between material or slicing style and …
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Creep predictions for turbomachinery components
Several theories of creep and creep rupture are reviewed. Specific attention is devoted to the brittle damage theory proposed by Kachanov. Creep, damage and life predictions for rectangular or circular cross section beams under bending and tensile loads are presented. Comparison with data for a Ni …
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Manufacturing of Poly(vinylidene fluoride) and Evaluation of its Mechanical Properties
… of piezoelectric polymers. In-situ mechanical testing of biased piezoelectric PVDF films successfully measured changes in loss and storage modulus. In-situ creep testing measured an increase in stiffness while in-situ dynamic mechanical analysis (DMA) measured and overall decrease in loss and …
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Development of an alternative test to obtain asphalt mixture creep compliance at low temperatures
… [DC(T)] test and the Indirect Tensile [IDT] creep compliance tests are widely used in the pavement materials community to characterize the low temperature fracture and creep properties of asphalt materials. The information from these tests enables pavement engineers to design and construct …
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Validierung des nichtlinearen Verformungsverhaltens von großen Einkristall-Gasturbinenschaufeln aus CMSX-4
… single crystal superalloys have the required creep strength and thermo-mechanical fatigue resistance. Single crystal blades exhibit a highly anisotropic deformation behaviour and are subjected to triaxial stress fields induced by complex cooling systems. Consequently the prediction of their …
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Multiscale In-Situ Characterization of Crystal Orientation, Temperature, and Microstructure Effects on Creep Defromation of Pure Magnesium and Mg-Al-RE Alloys
… Their broader use is restricted by limited creep resistance and pronounced anisotropy of plastic deformation, especially at elevated temperatures. This thesis examines how crystal orientation, temperature, and β-phase morphology govern creep behavior in pure Mg and AE44 alloys. Novel in-situ …
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An experimental investigation of the creep behavior of an underground coalmine roof with shale formation
… Mechanics) and the ASTM (American Society for Testing and Materials) have not recommended any creep testing procedure. Therefore, the objective of this research was to investigate the time-dependent deformational behavior of immediate coal measures rock (shale) and then use phenomenological …
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Creep Behavior Of Thin Laminates Of Iron-Cobalt Alloys For Use In Switched Reluctance Motors And Generators
… this effort to measure, model, and predict the creep behavior of such advanced magnetic materials. Hiperco® Alloy 50HS, manufactured by Carpenter Technology Corporation, is one of the leading candidates for application and is studied in this effort by subjecting mechanical test specimens to a …
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Complex Mechanical Properties of Steel
… this category are impact toughness, fatigue, creep and combinations of these phenomena. The work presented in this thesis is an attempt to progress in this area of complex mechanical properties in the context of steels, although the outcomes may be more widely applied. The approach used relies …
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Characterization of the viscoelastic and flow properties of High Density Polyethylene Resins for Pipes in the Solid and Melt State
… of pipes, but brought new challenges to their testing and characterization. There is a need to understand the rheological behavior of the resins, their processing, and their associated properties in a finished pipe. The rheological behavior of the resins was studied to characterize the effect …
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Neue Verfahren zur Analyse des Verformungs- und Schädigungsverhaltens von MCrAlY-Schichten im Wärmedämmschichtsystem
… 0,4% Hf) on the single crystal alloy CMSX-4. The creep properties within the coating system of the MCrAlY bond coat have been investigated using a double shear creep testing assembly, especially developed for thermal barrier coatings. Parameters to describe primary and secondary creep for the …
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Extraction of mechanical properties over a range of strain rates from indentation data
A procedure is described for indentation creep plastometry. It is based on iterative numerical simulation of the indentation process, with repeated comparison between an experimental outcome and the corresponding model prediction, systematically varying the values of parameters in a constitutive …
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The influence of prior creep damage on the fracture localisation in X20 CrMoV12-1 cross-weld creep tests
… main steam pipe components to operate within the creep regime. It is of utmost importance for safety and plant health that these critical components are managed to determine the remaining life and risks associated with high temperature exposure for prolonged periods of time. Non-destructive …
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