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  • 1
    Electronic Resource
    Electronic Resource
    Fractographic characteristics of fatique crack development during programmed loading of steel (1986)
    Springer
    Metal science and heat treatment 28 (1986), S. 205-209 
    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
    Notes: Conclusions 1. The use of stresses close to the yield point under programmed and cyclic loading of the samples does not show a significant influence on the kinetics of crack growth during the next small loading. This supports the hypothesis of a linear accumulation of damage at the failure stage. 2. A fatigue crack in a sample with a sharp notch initially develops from many separate microcracks which merge into one general front advancing to the center of the sample. 3. Under small nominal stresses the greater part of the fatigue failure surface of austenitic steel 12Kh18N9T has a "wavelike" form with a radial arrangement of separate waves. The fatigue grooves whose direction is across the cracks develop in samples of this steel only close to the terminal surface region. 4. In ferrite—pearlite steels the "wavelike" structure is not observed, but a "fibrous" structure arises which appears in the early stages of failure as sharply outlined crests. The direction of the fibrous relief is with the orientation of the separate grains. The displacement of the fibers in the separate grains varies. 5. The formation of a fibrous structure during fatigue failure and the secondary system of cracks could possibly be connected with the presence of a radial stress at the apex of the crack.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00705393
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  • 2
    Electronic Resource
    Electronic Resource
    Fatigue crack propagation in steels with different yield strengths (1977)
    Springer
    Metal science and heat treatment 19 (1977), S. 465-468 
    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
    Notes: Conclusions 1. Fatigue crack propagation in low-alloy and low-carbon steels can be described by the relationship d2a/dN=C(ΔK)n. Two sections — lower and upper — are observed on the curves of crack growth, differing from each other in their slope to the ΔK axis. 2. The length of the fatigue crack corresponding to the change from one section to the other increases with increasing yield strength of the steels. 3. On the lower section, with a steeper slope to the ΔK axis, corresponding to the initial stage of crack growth, the average rate of crack propagation is considerably smaller than in the upper section. 4. In the upper section the relationship between exponent n and coefficient C and the yield strength and ultimate strength of the steels is almost linear. 5. The average rate of fatigue crack propagation in low-alloy and low-carbon steels decreases with increasing yield strength, as the result of which the life of the steel increases. The largest values of vav were obtained for steel 15kp and the smallest for steel 10G2S1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00713084
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of high-temperature mechanicothermal treatment on the heat resistance of steel 1Kh14N18V2BR1 (ÉI726) (1968)
    Springer
    Metal science and heat treatment 10 (1968), S. 157-159 
    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
    Notes: Conclusions Plastic deformation of steel 1Kh14N18V2BR1 (ÉI726) at high temperatures under conditions where the effect of this treatment is retained not only increases the ultimate tensile strength and creep resistance but also substantially increases the fatigue strength at elevated temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657766
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  • 4
    Electronic Resource
    Electronic Resource
    Static and fatigue strength of alloy KhN40MDTYu (Ép 543) after hardening under various conditions (1973)
    Springer
    Metal science and heat treatment 15 (1973), S. 707-709 
    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
    Notes: Conclusions 1. The strength of alloy KhN40MDTYu (ÉP 543) can be increased substantially by high-temperature plastic deformation with final rolling temperatures at which no recrystallization occurs and aging (treatment I) or plastic deformation (10–20%) at room temperature with subsequent aging (treatment II). Treatment I is more effective. 2. Treatment I substantially increases the strength, with retention of fairly high ductility and impact strength. The fatigue strength increases approximately 100% as compared with the original quenched condition and can be additionally increased by surface hardening — shotpeening in particular. 3. Treatment II increases the strength but greatly reduces the ductility and impact strength at all degrees of deformation tested. In this case there is an optimal degree of deformation (10–20%) at which the fatigue strength reaches its maximum value. Aging increases the strength after prior deformation of 15–20%, but lowers the strength after larger deformations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654774
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  • 5
    Electronic Resource
    Electronic Resource
    Changes in the dislocation arrays of high-strength structural steel during fatigue (1974)
    Springer
    Metal science and heat treatment 16 (1974), S. 144-146 
    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
    Notes: Conclusions 1. Transmission electron microscopy and limited-area diffraction analysis showed that cyclic deformation is accompanied by higher dislocation densities, fragmentation of martensite rods, thickening of the boundaries of fragments, and higher misorientation angles. 2. During cyclic loading the structure of the surface layers changes more than that of the inner layers. 3. The total plastic deformation at the level of the fatigue limit is quite small and is quite uneven through the volume of the sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649791
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  • 6
    Electronic Resource
    Electronic Resource
    Utilization of statistical criteria for standardizing the methods of checking metal-testing machines (1968)
    Springer
    Measurement techniques 11 (1968), S. 1462-1464 
    Details
    ISSN: 1573-8906
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Conclusions 1. In order to provide identical readings for the material testing machines it is advisable to standardize their combined checking by utilizing statistical criteria. 2. This technique has been approved for normalizing errors in MTL-10G machines for the technological testing of sheet metal. It has been established that in this case the hypothesis about the adequate reproducibility of testing by means of these machines has been confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00986022
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  • 7
    Electronic Resource
    Electronic Resource
    Electron fractographic analysis of fatigue fractures of steels (1978)
    Springer
    Metal science and heat treatment 20 (1978), S. 160-162 
    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/BF00670319
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  • 8
    Electronic Resource
    Electronic Resource
    Fatigue crack propagation in cylindrical steel specimens with a sharp annular notch (1984)
    Springer
    Strength of materials 16 (1984), S. 170-176 
    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/BF01530051
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of absolute dimensions on fatigue crack growth rate in notched cylindrical specimen (1980)
    Springer
    Strength of materials 12 (1980), S. 25-30 
    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. There are three stages in the growth of a fatigue crack in a cylindrical specimen with a sharp annular notch: delayed, stable, and accelerated crack growth. At all stages, crack growth rate is higher, the larger the diameter of the specimens. 2. The rate of fatigue crack growth under the conditions described above depends in the stable section on the stress state created by the initial notch and the tip of the developed crack. It may be determined on the basis of an exponential dependence on specimen diameter and nominal stress. 3. Crack growth rate on the accelerated section is determined mainly by the stress state created close to the crack tip and may be computed from Paris' equation, in which the parameters n and C should be chosen with consideration of specimen dimensions and nominal stress. 4. The main reason for the substantial change in fatigue crack growth rate and the time of its growth with a change in specimen size is the dissimilarity in loads caused by different stress gradients for small and large specimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00771873
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  • 10
    Electronic Resource
    Electronic Resource
    Study of the patterns of fatigue crack propagation (1974)
    Springer
    Strength of materials 6 (1974), S. 490-494 
    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 shown that in the case of a test piece with a stress concentrator in the form of a central hole the ratio of the period of fatigue crack generation to the period of its development depended on the stress level. The closer the stress is to the fatigue limit, the greater the proportion of total test piece life attributable to the period of crack generation. 2. It was confirmed that the relationship between the speed of crack propagation and the stress intensity factor at the tip of the crack was well described by a power function in the form ϖa/ϖN=CΔkm. 3. A comparison of experimental data on the relationship between crack propagation speed and the range of the stress intensity factor for essentially different steels and alloys obtained under various experimental conditions indicates the possibility of broad generalizations on this pattern.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01528250
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