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  • 1
    Electronic Resource
    Electronic Resource
    A multiparameter approach to the prediction of fatigue crack growth in metallic materials (2001)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 24 (2001), 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 multiparameter approach is proposed for the characterization of fatigue crack growth in metallic materials. The model assesses the combined effects of identifiable multiple variables that can contribute to fatigue crack growth. Mathematical expressions are presented for the determination of fatigue crack growth rates, da/dN, as functions of multiple variables, including stress intensity factor range, ΔK, stress ratio, R, crack closure stress intensity factor, Kcl , the maximum stress intensity factor Kmax , nominal specimen thickness, t, frequency, Ω, and temperature, T. A generalized empirical methodology is proposed for the estimation of fatigue crack growth rates as a function of these variables. The validity of the methodology is then verified by making appropriate comparisons between predicted and measured fatigue crack growth data obtained from experiments on Ti–6Al–4V. The effects of stress ratio and specimen thickness on fatigue crack growth rates are then rationalized by crack closure considerations. The multiparameter model is also shown to provide a good fit to experimental data obtained for HY-80 steel, Inconel 718 polycrystal and Inconel 718 single crystal. Finally, the implications of the results are discussed for the prediction of fatigue crack growth and fatigue life.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.2001.00404.x
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  • 2
    Electronic Resource
    Electronic Resource
    A modified mixed-mode bending specimen for the interfacial fracture testing of dissimilar materials (1999)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 22 (1999), 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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.1999.00203.x
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  • 3
    Electronic Resource
    Electronic Resource
    THE PROPAGATION OF NON-COPLANAR SEMI-ELLIPTICAL FATIGUE CRACKS (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 14 (1991), 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: Abstract— The results of fatigue tests on specimens containing parallel offset and parallel collinear configurations of multiple non-coplanar cracks are presented. The fatigue growth of parallel collinear cracks is shown to be significantly affected by crack-tip shielding and parallel offset cracks are shown to grow almost independently before their adjacent tips overlap. Subsequent growth in the region of overlap results in coalescence which begins when the deviating crack tips come into contact below the surfaces of the specimens. Simplified predictions of the propagation of offset non-coplanar semi-elliptical cracks are also presented and their implications for the prediction of fatigue lives in structures containing offset coplanar cracks are assessed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1991.tb00641.x
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  • 4
    Electronic Resource
    Electronic Resource
    A STUDY OF THE INTERACTION AND COALESCENCE OF TWO COPLANAR FATIGUE CRACKS IN BENDING (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 12 (1989), 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: Abstract— This paper reports the results of an experimental and numerical investigation of the interaction and coalescence of two coplanar semi-elliptical cracks. Fatigue crack growth data were obtained from a four-point bend specimen using the direct current potential difference method and a beachmarking technique. A finite element simulation of the experimental conditions was also performed. Crack advance was computed from the Paris equation on a step by step basis. Good agreement between experimental fatigue crack growth data and the finite element predictions is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1989.tb00524.x
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  • 5
    Electronic Resource
    Electronic Resource
    Deformation and Fracture Properties of Damage Tolerant In-situ Titanium Matrix Composites (1997)
    Springer
    Applied composite materials 4 (1997), S. 361-374 
    Details
    ISSN: 1573-4897
    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 discusses the tensile response and fracture toughness ofin-situ titanium alloy metal matrices discontinuously-reinforced withwhiskers of titanium boride which were successfully produced by ingotmetallurgy techniques. Additions of elemental boron resulted in a nearuniform dispersion of the rod-like titanium boride (TiB) reinforcements inthe alloy matrix. Such composites have engendered considerable scientificand technological interest due to their attractive combinations of improvedmechanical properties and low manufacturing cost. The improved elasticmoduli of the composites are explained using shear lag and rule-of-mixturestheories. The increased strengths of the in-situ composites are rationalizedby considering the combined effects of deformation restraints imposed by thestiff whiskers and strengthening contributions arising from the substructurethat evolves from the presence of additional dislocations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008843504184
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  • 6
    Electronic Resource
    Electronic Resource
    The tensile behavior of a silicon carbide fiber-reinforced titanium matrix composite (1996)
    Springer
    Applied composite materials 3 (1996), S. 215-247 
    Details
    ISSN: 1573-4897
    Keywords: composite ; titanium alloy ; microstructure ; tensile properties ; damage ; fracture
    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 summarizes the results of a study on the effects of composite microstructure and test temperature on tensile deformation and fracture behavior of a symmetric [0/90]2s titanium alloy metal-matrix composite. Matrix microstructure is controlled by heat treatment, which is used to produce metastable β or Widmanstatten α+β microstructures. The sequence of damage initiation and evolution at both room and elevated temperature (650°C) is identified using ex-situ scanning electron microscopy observations during incremental monotonic loading to failure. The nature, sequence and complexity of damage during uniaxial loading is presented and discussed in light of competing and mutually interactive influences of load level and deformation characteristics of the microstructure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00134697
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  • 7
    Electronic Resource
    Electronic Resource
    The tensile behaviour of gamma titanium aluminide intermetallic (1996)
    Springer
    Journal of materials science 31 (1996), S. 2193-2198 
    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 titanium aluminide alloys based on gamma have, in recent years, engendered considerable scientific and technological interest because they offer several useful properties that are either comparable to or better than those of the conventional alloys of titanium and nickle-base superalloy families. In this paper, the tensile behaviour of a gamma-TiAl intermetallic is reported. The intermetallic has a near lamellar microstructure comprising regions of single-phase γ grains, coarse twin-related lamellae and fine lamellae. The tensile properties of the intermetallic containing chromium and niobium are inferior to those of the binary counterpart. Tensile fracture was primarily by intergranular rupture with microcracking along the grain boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356645
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  • 8
    Electronic Resource
    Electronic Resource
    Microstructure and the fracture behaviou of a Ti–24Al–11Nb intermetallic (1997)
    Springer
    Journal of materials science 32 (1997), S. 5833-5847 
    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 results of a study of the effects of heat treatment on the microstructure and fracture behaviour of an α2-based Ti–24Al–11Nb intermetallic are reported in this paper. The effects of cooling rate, annealing temperature and annealing duration on the microstructure are discussed in detail. Room- and elevated-temperature fracture mechanisms are elucidated. Toughening is shown to mainly occur by crack-tip blunting, and to a lesser extent via crack bridging and crack deflection mechanisms. A new micromechanics model is presented for the estimation of the shielding due to crack-tip blunting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018694423368
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  • 9
    Electronic Resource
    Electronic Resource
    On the calibration of the direct current potential difference method for the determination of semi-elliptical crack lengths (1990)
    Springer
    International journal of fracture 44 (1990), S. 27-41 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé L'étude a trait à l'étalonnage de la technique des différences de potentiel en courant continu pour la mesure des longueurs de fissures semi-circulaires dites “en ongle”. On procède au calibrage d'échantillons en acier et on recourt à une méthode analogique à trois dimensions, qui utilise, pour simuler une pièce d'essai, le concept d'un récipient rempli d'électrolyte. On constate un bon accord entre les deux méthodes d'étalonnage, et on compare les résultats à ceux d'une solution analytique appliquée à une fissure semi-circulaire située dans un demi-espace.
    Notes: Abstract This paper treats the calibration of the direct-current, potential difference (d.c.p.d.) technique for the measurement of the lengths of semi-elliptical (“thumbnail”) cracks. Calibrations utilised the beachmarking of steel specimens and a three-dimensional analogue method, which employed an electrolytic tank to simulate a testpiece. The agreement between the two sets of calibrations was good, and the results have been compared with an analytical solution for a semi-circular crack in a half-space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012550
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  • 10
    Electronic Resource
    Electronic Resource
    Investigation of the effects of microstructure on creep deformation in α2-based titanium aluminide intermetallics (1997)
    Springer
    Journal of materials science 32 (1997), S. 1877-1887 
    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 results of a systematic investigation of the effects of microstructure/substructure on the secondary creep behaviour of α2-based titanium aluminide alloys are presented. This includes a study of the effects of heat treatment on the steady-state creep behaviour of α2+β-processed Ti–24Al–11Nb and Ti–25Al–10Nb–3V–1Mo at 540, 650 and 760°C, and an investigation of the effects of creep deformation on dislocation substructures in Ti–24Al–11Nb. The parameters that control secondary creep deformation are identified for both alloys, and the results are compared with data obtained for conventional high-temperature near-α titanium alloys and β-forged Ti–24Al–10Nb–3V–1Mo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018565125591
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