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  • 1
    Electronic Resource
    Electronic Resource
    Fatigue life prediction and failure analysis of a gas turbine disc using the finite-element method (2004)
    PO Box 1354, 9600 Garsington Road, Oxford OX4 2XG, UK. : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 27 (2004), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A numerical prediction of the life of a gas turbine model disc by means of the finite-element technique is presented and the solution is compared with an experimental rim-spinning test. The finite-element method was used to obtain the K solution for a disc with two types of cracks, both at the notch root of the blade insert and located in the corner and in the centre. A crack aspect ratio of (a/c) = 1 was assumed. The fracture mechanics parameters J-integral and K were used in the assessment, which were computed with linear elastic and elastic–plastic material behaviour. Using a crack propagation program with appropriate fatigue-creep crack growth-rate data, previously obtained in specimens for the nickel-based superalloy IN718 at 600 °C, fatigue life predictions were made. The predicted life results were checked against experimental data obtained in real model discs. The numerical method, based on experimental fatigue data obtained in small laboratory specimens, shows great potential for development, and may be able to reduce the enormous costs involved in the testing of model and full-size components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.2004.00810.x
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  • 2
    Electronic Resource
    Electronic Resource
    Transverse tensile behaviour of fibre reinforced titanium metal matrix composites (1998)
    Springer
    Journal of materials science 33 (1998), S. 5499-5508 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Four Ti MMCs have been tested in transverse tension, at ambient temperature and 600 °C. Generally, mechanical properties are reduced compared to monolithic Ti alloys. Transverse Young's modulus is, however, higher than in monolithic alloys, as a result of constraint of the matrix by the fibres. MMC proportional limits are associated with the onset of interfacial failure. Fibre coating cracking and longitudinal fibre splitting may also contribute to MMC yield and the associated acoustic emission peak. The fibre/matrix interface in IMI 834/SM1140+ appears to be weaker than in the other MMCs, resulting in a lower proportional limit and less acoustic emission. Final failure of the MMCs is generally via ductile shearing of matrix ligaments. The exception to this is IMI 834/SM1140+ in which the matrix fails in a brittle manner. This causes poor transverse tensile strength and failure strain in this MMC. A model to predict the MMC proportional limit, previously proposed by Jansson et al., has been modified to take account of the tensile strength of the fibre/matrix interface. The model previously used by Jansson et al. to predict the transverse tensile strength is acceptably accurate provided that the area fraction of matrix appearing on fracture surfaces is accurately determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004435325205
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  • 3
    Electronic Resource
    Electronic Resource
    Modelling and lifing of structural materials for future aeroengine components (1996)
    Springer
    Advanced performance materials 3 (1996), S. 263-278 
    Details
    ISSN: 1572-8765
    Keywords: component lifing ; creep ; low cycle fatigue ; fracture mechanics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper reports on some of the major research and development activities at the SMC into materials modelling of existing advanced high strength superalloys and the work in progress to understand the step change materials which will have to be introduced into future engines to meet the perceived performance requirements. These studies are aimed at developing appropriate lifing methodologies and ensuring safe service usage of these materials. Lifing models for dwell sensitive titanium alloys, powder metallurgy materials, single crystal alloys, metal matrix composites and intermetallic alloys are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00136791
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  • 4
    Electronic Resource
    Electronic Resource
    Modes of failure under creep/fatigue loading of a nickel-based superalloy (1985)
    Springer
    Journal of materials science 20 (1985), S. 2471-2476 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Crack growth experiments have been carried out under combined creep and fatigue loading at 700° C on a hot isostatically pressed powder nickel alloy. A fractographic investigation has been undertaken of the modes of failure over a frequency range of 0.001 to 10 Hz. The observations indicate that under static loading and at low frequencies failure is intergranular and controlled by creep processes, whereas at high frequencies a transgranular fatigue fracture is obtained. The transition from creep to fatigue behaviour is found to be progressive, and to begin at a lower frequency the higher the ratio of cyclic to mean load. In the transition region a mixed intergranular and transgranular fracture surface is observed, which correlates well with the recorded proportion of creep to fatigue crack growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556076
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  • 5
    Electronic Resource
    Electronic Resource
    Substitutional dynamic strain ageing in an iron — 1.1 at. % niobium alloy (1971)
    Springer
    Journal of materials science 6 (1971), S. 1355-1361 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The mechanical properties of an Fe-1.1 at. % Nb alloy have been studied in compression over the temperature range 300 to 1100°K. The substitutional niobium atoms were responsible for dynamic strain ageing which resulted in a small peak in the temperature dependence of the flow stress, negative strain rate sensitivity, and serrated stress strain curves. The serrations were preceded by a strain rate and temperature dependent critical strain. These dependencies were analysed using theories that have been successfully applied to substitutional strain ageing in fcc structures. The analysis showed that, unlike in fcc structures, the apparent activation energy for the onset of serrated flow increased at the faster strain rates; this was attributed to the vacancies produced by the plastic deformation rapidly annealing out due to the high temperatures involved at the faster strain rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00549680
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of fabrication parameters on the microstructural quality of fibre–foil titanium metal matrix composites (1998)
    Springer
    Journal of materials science 33 (1998), S. 3607-3614 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The microstructure of fibre–foil Ti–6Al–4V (composition in weight per cent) and IMI 834 matrix metal matrix composites (MMCs), and corresponding foil-bonded alloys, are investigated in relation to fabrication parameters. Higher fabrication temperatures are required in IMI 834 MMCs, which results in a thicker interfacial reaction layer than in Ti–6Al–4V MMCs. The matrix microstructure in all materials is predominantly α with intergranular β, as a result of the slow cooling rate. MMCs reinforced with SM1240 fibres exhibit boron precipitates along foil bond lines, owing to diffusion during consolidation. Fabrication using fibre mats with 7.1 fibres per millimeter (FPM) results in an excellent microstructure in (Ti–6Al–4V)–SM1240. The larger diameter of the SM1140+fibre compared with SM1240 means that (Ti–6Al–4V)–SM1140+requires FPM significantly below 7.1 in order to produce acceptable microstructural quality. The higher residual stresses in IMI 834 MMCs result in cracking of the matrix and fibre–matrix interfacial region when a FPM of 7.1 is used. Acceptable microstructural quality is observed in IMI 834 MMCs when the FPM of fibre mats is reduced to 6.3. Interfibre cracking in IMI 834–SM1140+is enhanced by a higher matrix microhardness than the other materials. This high hardness may be caused by a high matrix carbon content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004655329112
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  • 7
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    Substitutional dynamic strain ageing in an iron ? 1.1 at. % niobium alloy (1971)
    Springer
    Details
    Publication Date: 1971-11-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 8
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    Fatigue life prediction and failure analysis of a gas turbine disc using the finite-element method (2004)
    Springer
    Details
    Publication Date: 2004-09-01
    Print ISSN: 0376-9429
    Electronic ISSN: 1573-2673
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 9
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    Modes of failure under creep/fatigue loading of a nickel-based superalloy (1985)
    Springer
    Details
    Publication Date: 1985-07-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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