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  • 1985-1989  (24)
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  • 1
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    SURFACE CRACKS AND THE FATIGUE LIMIT OF METALS (1988)
    Springer
    Details
    Publication Date: 1988-03-01
    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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    PAPER CURRENT
  • 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
    Fatigue crack growth in nickel alloys at high temperatures (1986)
    Springer
    Strength of materials 18 (1986), S. 989-993 
    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. At all test temperatures the characteristics of cyclic crack resistance of ZhS6F alloy are substantially higher than for ZhS6KP alloy. 2. In ZhS6F alloy at increased test temperatures and in ZhS6KP alloy at all temperatures fatigue crack development occurred in the area of maximum tensile stresses regardless of the crystallographic orientation of the specimen. With an increase in test temperature from 293 to 1273°K the crack growth development increased by an order of magnitude for ZhS6P alloy and by two orders for ZhS6KP. 3. An increase in test temperature or a reduction in load level of both alloys caused a transition from brittle crystallographic fracture to more ductile with the formation of smoother surfaces. 4. ZhS6KP is significantly more damaged by oxidation at increased test temperatures than ZhS6F alloy. 5. Regardless of the crystallographic orientation of the ZhS6F alloy specimen at room temperature in it fatigue crack development occurred in the (111) plane with the formation of one or two macroareas. The fracture had a brittle cleavage character.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01525341
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  • 4
    Electronic Resource
    Electronic Resource
    Method of investigating the regularities of unstable crack development in cyclic loading with the application of acoustic emission (1985)
    Springer
    Strength of materials 17 (1985), S. 1671-1675 
    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/BF01523003
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  • 5
    Electronic Resource
    Electronic Resource
    Method and some results of study of fatigue-crack opening (1987)
    Springer
    Strength of materials 19 (1987), S. 1330-1336 
    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 method was proposed for determining the opening of a fatigue crack. The method is based on measurement of the displacement of points lying near the crack edges. 2. A program was developed for cycle-by-cycle calculation of P−δ diagrams and determination of the crack-opening load and the effective range of the crack opening and SIF. 3. It was established that to obtain values of Kop corresponding to the opening of a crack on specimens of steels 15Kh2MFA (I) and 15Kh2MFA (II), the load-displacement diagrams need to be recorded at a distance r≤1.4 mm from the crack tip. 4. An increase in the measurement base from 2.5 to 6 mm has no effect on the relation Kop−r. However, it does increase the displacement at which the crack opens and, thus, the range of crack opening. 5. The stress intensity factor at which the crack opens is independent of Kmax (at Kmax=20–38 MPa $$\sqrt m $$ ) for steel 15Kh2MFA (II) but increases threefold for steel 15Kh2MFA (I) with an increase in Kmax from 10 to 70 MPa $$\sqrt m $$ . 6. A method was developed to calculate crack-tip opening from measurements of the displacement of the crack edges a certain distance r from the tip of the crack. The method is based on the fact that there exists a single dependence of the ratio of the effective ranges of crack opening and SIF on the distance r, regardless of the value of Kmax.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01523230
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  • 6
    Electronic Resource
    Electronic Resource
    Strain hysteresis in cyclic tension-compression and torsion (1985)
    Springer
    Strength of materials 17 (1985), S. 466-471 
    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. For 45 steel a nonlinear relationship between the strains in the longitudinal εx and transverse εy directions in tension-compression was established in loading above the cyclic proportional limit, which leads to the formation of a hysteresis loop. 2. For the investigated steel the interrelationship between the deformations in the longitudinal and transverse directions in cyclic tension-compression is the same for any number of cycles at which these deformations were determined, which is responsible for their unambiguous relationship to the degree of damage of the given material. 3. The formation of a hysteresis loop in εx−εy coordinates in cyclic tension-compression is related to the change in Poisson's ratio as the result of accumulation of microcracks in the material. 4. In tests under conditions of cyclic torsion, a strain hysteresis loop is not observed between the deformations in the directions perpendicular to the main planes since the ratio of these deformations is unchanged at all levels of stresses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01533943
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of single plastic prestraining on crack resistance. 2. An approach to predicting the fatigue crack growth rate (1988)
    Springer
    Strength of materials 20 (1988), S. 1558-1563 
    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. Single plastic prestraining leads to a decrease of the threshold level of the stress intensity factor range of alloys if they do not form pores or microcracks during deformation. These structural defects cause stress relaxation or crack tip blunting which causes an increase in the threshold level of the SIF. 2. A material classification is presented which is based on sensitivity of FCG rate in the middle section of the kinetic diagram of fatigue failure to the degree of prestraining Cold deformation, rolling, or tensile tension increases the FCG rate of cyclic hardened materials (σu/σ0.2〉1.5) and decreases it for cyclic softened or cyclic stable materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01528957
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of single plastic prestraining on crack resistance. 1. The rate of fatigue crack growth in heat-resistant steel (1988)
    Springer
    Strength of materials 20 (1988), S. 1552-1558 
    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. Prestraining has an ambiguous effects on the FCG rate in steels 15Kh1MFA (I) and 15Kh2MFA (II). With increase in prestraining there is a decrease in the FCG rate in the threshold region of the KDFF of steel 15Kh2MFA (I) and also in the middle section for steel 15Kh2MFA (II). However, in the threshold region of the KDFF of steel 15Kh2MFA (II) FCG increases. 2. An increase in the level of prestraining for steels 15Kh2MFA (I) and 15Kh2MFA (II) leads to an increase of the SIF during opening of the crack. Due to this, the KDFF of these steels when plotted in the coordinates log V−log ΔKeff is invariant relative to the degree of prestraining.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01528956
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  • 9
    Electronic Resource
    Electronic Resource
    Life of steels in fretting fatigue (1988)
    Springer
    Strength of materials 20 (1988), S. 703-709 
    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/BF01530080
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of the temperature on the crack resistance characteristics of steel with different strength levels (1988)
    Springer
    Strength of materials 20 (1988), S. 1138-1145 
    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. On the basis of the experimental investigation of the effect of the test temperature (153–293°K) on the rate of FCG in steels IP-1, IP-2, and IP-3 with a coefficient of load cycle asymmetry R=−2, −1, 0, and 0.5 it was established that lowering of the test temperature has an ambiguous effect on the rate of fatigue crack growth in the mentioned steels. In most cases the rate of FCG is practically insensitive to the test temperature although we can see a general tendency of the coefficient m of the Paris equation increasing with the test temperature being lowered from 293 to 153°K. 2. A change of the coefficient of load cycle asymmetry in the range −2–0 does not have a substantial effect on the rate of FCG, and in the range 0–0.5 it reduces this rate (in coordinates dℓ/dN-Kmax) at 213 and 293°K, particularly substantially at 213°K. 3. For the investigated chrome-nickel-molybdenum steels in the temperature range 293-153°K a single dependence was established; it describes the decrease of the coefficient m with rising level of fracture toughness under static loading. 4. With the test temperature rising from 113 to 153°K, the characteristics of fracture toughness of all the investigated steels increase monotonically under static and cyclic loading, and also in the case of stopping of the crack. 5. Cyclic loading reduces substantially (to one half) the fracture toughness of steels IP-1 and IP-2 in the temperature range 113–153°K and does not change the values of K1 fc compared with KIc for steel IP-3. 6. In steels IP-1, IP-2 at temperatures of 113–153°K the fracture toughness under cyclic loading corresponding to final fracture of the specimen practically coincides with the fracture toughness at the instant of stopping of the crack. 7. In the temperature range 100–183°K of the three investigated steels steel IP-1 has the highest resistance to brittle failure under static loading and at the instant of stopping of the crack, steel IP-2 has the lowest resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02082728
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