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  • 1
    Electronic Resource
    Electronic Resource
    CYCLIC LOADING AND FRACTURE TOUGHNESS OF STEELS (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 1 (1979), 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 paper considers the effect of cyclic loading and loading rate upon fracture toughness characteristics of steels at room and low temperatures. It is shown that fracture toughness of a low-alloy ferrite-pearlite steel with 0·1% C (steel 1) and for 15G2AFDps steel of the same class (steel 2) are 2 to 2·5 times lower under cyclic loading (50 and 0·5 Hz) and dynamic loading (K̇= 1·5 × 106MPa √m s−1) than under static loading (K̇= 0·6 to 9 MPa √m s−1). For quenched and low-tempered 45 steel at 293 K and for armco-iron at 77 K fracture toughness characteristics do not depend on the loading condition. Macro- and micro-fractographic investigations revealed a correlation between the plastic zone size and the length of brittle fracture areas which are formed in steels 1 and 2, and in armco-iron during unstable propagation of the fatigue crack. Dependence of the decrease of the critical stress intensity factor under cyclic loading on the number of load cycles are obtained for repeating (R= 0) and alternating bending (R=−1) of specimens with a crack. A model for the transition from stable to unstable crack propagation is proposed involving crack velocity in the zone ahead of the crack tip damaged by cyclic plastic deformation. A new approach is suggested to the classification of materials on the basis of the sensitivity of fracture toughness characteristics to cyclic conditions of loading.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1979.tb00381.x
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  • 2
    Electronic Resource
    Electronic Resource
    SURFACE CRACKS AND THE FATIGUE LIMIT OF METALS (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 11 (1988), 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— A technique based on indenting a sphere into a material has been developed for measuring the yield strength of metals at various depths from the surface. Proceeding from the experimentally established reduction in the yield strength of the metal surface layer and cyclic crack growth resistance characteristics, the authors suggest a model simulating fatigue fracture based on the continuum mechanics assumptions which allows the fatigue limit to be estimated on the basis of a critical non-propagating fatigue crack size for components of various thickness in tension-compression or in bending; considering stress concentrations under both alternating and oscillating loads in the presence of near-surface stresses. Theoretical predictions using the model for three martensitic stainless steels and a titanium alloy showed a fair agreement with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1988.tb01164.x
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  • 3
    Electronic Resource
    Electronic Resource
    Fractographic features and rate of fatigue crack development in steels before failure (1983)
    Springer
    Metal science and heat treatment 25 (1983), S. 372-376 
    Details
    ISSN: 1573-8973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00795700
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  • 4
    Electronic Resource
    Electronic Resource
    Characteristics of fracture toughness of metals during cyclic loading. I (1978)
    Springer
    Strength of materials 10 (1978), S. 126-135 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. A detailed experimental investigation has been made of the fracture toughness characteristics of various structural steels (10GN2MFA, 15G2AFDps, 45) and Armco iron over a wide range of low temperatures with static, dynamic, and cyclic load application. It has been shown that the materials investigated may be divided into two groups according to the nature of the influence of the loading system. The first group includes the type 10GN2MFA and 15G2AFDps steels for which the fracture toughness characteristics obtained during cyclic and dynamic loading are significantly lower than the fracture toughness characteristics obtained during static loading by the standard method. The second group includes type 45 steel and Armco iron. For this group the fracture toughness characteristics are almost independent of the type of loading system. 2. An analysis of the effects of various factors on the fracture toughness characteristics has been made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01524626
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  • 5
    Electronic Resource
    Electronic Resource
    Fracture toughness characteristics of metals in fatigue. Report no. 2 (1978)
    Springer
    Strength of materials 10 (1978), S. 255-260 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Based on an analysis of the experimental data obtained and the results of fractographic studies of fracture surfaces, we have proposed a model of fatigue crack growth under cyclic loading and the transition to unstable crack growth, based on a consideration of the crack growth rate in a zone damaged during cyclic loading and explaining the above-noted test results. 2. It has been shown that, together with strain-rate sensitivity, characteristics of the cyclic strain of metals may be used as bases for classifying materials according to the degree to which the cyclicity of load application effects a reduction in fracture toughness. The reduction is greatest for materials sensitive to strain rate and steels which do not strain-harden under cyclic loads. There is no such effect for materials not strain-rate sensitive and for steels which strain-harden under cyclic loads, as well as for steels with very small cyclic strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01522738
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental determination of the stress intensity factor for cracks with a curvi-linear front in complex components (gas-turbine engine blades) (1981)
    Springer
    Strength of materials 13 (1981), S. 518-526 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00762510
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluation of the fatigue life of compressor blades of gas-turbine engines in the probability aspect (1983)
    Springer
    Strength of materials 15 (1983), S. 1600-1603 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01523568
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  • 8
    Electronic Resource
    Electronic Resource
    Fatigue crack resistance of crankshafts (1983)
    Springer
    Strength of materials 15 (1983), S. 652-655 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01523212
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  • 9
    Electronic Resource
    Electronic Resource
    Relationship between fracture toughness characteristics for cyclic and dynamic loadings (1983)
    Springer
    Strength of materials 15 (1983), S. 1058-1064 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. It was established on the basis of an experimental study of the conditions of unstable crack propagation during cyclic loading that, depending on the relation between Ki fc and KID and the change in the reserve of elastic strain energy in the system during brittle crack propagation, the length of the crack jump is determined either by the size of the damaged zone at the crack tip or by the law of change in the ISF during the jump. 2. We demonstrated the possibility of using an approximate theoretical analysis to predict the law of change in the store of elastic strain energy of the system during a crack jump and the length of the jump during cyclic loading.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01537683
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  • 10
    Electronic Resource
    Electronic Resource
    A method of calculated determination of the accelerated test conditions of compressor blades operating in a corrosive medium (1986)
    Springer
    Strength of materials 18 (1986), S. 622-629 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01522775
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