Influence of preliminary tension on the low-cycle fatigue of 40Kh13 steel in gaseous hydrogen

1985 ◽  
Vol 20 (6) ◽  
pp. 547-550
Author(s):  
A. N. Romaniv
Keyword(s):  
Low Cycle Fatigue ◽  
Gaseous Hydrogen ◽  
Cycle Fatigue ◽  
40Kh13 Steel ◽  
Preliminary Tension

Strain hardening of armco iron during low-cycle fatigue in gaseous hydrogen

1977 ◽  
Vol 13 (1) ◽  
pp. 4-7 ◽  
Author(s):  
A. N. Romaniv ◽  
V. I. Tkachev
Keyword(s):  
Strain Hardening ◽  
Armco Iron ◽  
Low Cycle Fatigue ◽  
Gaseous Hydrogen ◽  
Cycle Fatigue

Low-cycle fatigue of steel 2Kh13 in a medium of gaseous hydrogen

1974 ◽  
Vol 8 (1) ◽  
pp. 102-104
Author(s):  
A. N. Romaniv ◽  
V. I. Tkachev ◽  
R. I. Kripyakevich
Keyword(s):  
Low Cycle Fatigue ◽  
Gaseous Hydrogen ◽  
Cycle Fatigue ◽  
Steel 2Kh13

Low-cycle fatigue strength of maraging steel in gaseous hydrogen

1978 ◽  
Vol 13 (6) ◽  
pp. 598-600 ◽  
Author(s):  
A. N. Romaniv ◽  
V. I. Tkachev ◽  
V. D. Starinskii ◽  
K. B. Katsov
Keyword(s):  
Fatigue Strength ◽  
Maraging Steel ◽  
Low Cycle Fatigue ◽  
Gaseous Hydrogen ◽  
Cycle Fatigue

Low-cycle fatigue of iron and steel in gaseous hydrogen

1976 ◽  
Vol 11 (6) ◽  
pp. 631-635 ◽  
Author(s):  
A. N. Romaniv ◽  
V. I. Tkachev ◽  
G. V. Karpenko
Keyword(s):  
Low Cycle Fatigue ◽  
Gaseous Hydrogen ◽  
Cycle Fatigue ◽  
Iron And Steel

Effect of special purity gaseous hydrogen on the low-cycle fatigue of Kh18N10T steel

1978 ◽  
Vol 14 (3) ◽  
pp. 255-257
Author(s):  
A. N. Romaniv ◽  
G. A. Barannikova ◽  
V. I. Tkachev ◽  
V. V. Latyshev
Keyword(s):  
Low Cycle Fatigue ◽  
Gaseous Hydrogen ◽  
Kh18n10t Steel ◽  
Cycle Fatigue

Effect of Texture and {10-12} Twin on the Low Cycle Fatigue Properties of Rolled AZ31 Mg Alloy

2013 ◽  
Vol 51 (5) ◽  
pp. 325-332 ◽  
Author(s):  
Sung Hyuk Park ◽  
Seong-Gu Hong ◽  
Chong Soo Lee ◽  
Ha Sik Kim
Keyword(s):  
Low Cycle Fatigue ◽  
Mg Alloy ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Az31 Mg Alloy

Fracture Surface in Low Cycle Fatigue of HA-188 Cobalt Base Alloy at High Temperature

1978 ◽  
Vol 27 (292) ◽  
pp. 99-103 ◽  
Author(s):  
Kiyoshi KITA ◽  
Masanori KIYOSHIGE ◽  
Masatake TOMINAGA ◽  
Junzo FUJIOKA
Keyword(s):  
High Temperature ◽  
Fracture Surface ◽  
Base Alloy ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Cobalt Base Alloy ◽  
Cobalt Base

Features of the kinetics of cyclic elastoplastic deformation diagrams at dwells in cycles and superimposition of variable stresses on them

2020 ◽  
Vol 86 (12) ◽  
pp. 46-53
Author(s):  
M. M. Gadenin
Keyword(s):  
Experimental Data ◽  
Elastoplastic Deformation ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Loading Cycle ◽  
Additional Variable ◽  
Dynamic Creep ◽  
Variable Stresses ◽  
Kinetics Of ◽  
Deformation Diagrams

The goal of the study is determination of the regularities of changes in cyclic strains and related deformation diagrams attributed to the existence of time dwells in the loading modes and imposition of additional variable stresses on them. Analysis of the obtained experimental data on the kinetics of cyclic elastoplastic deformation diagrams and their parameters revealed that in contrast to regular cyclic loading (equal in stresses), additional deformations of static and dynamic creep are developed. The results of the studys are especially relevant for assessing the cyclic strength of unique extremely loaded objects of technology, including nuclear power equipment, units of aviation and space systems, etc. The experiments were carried out on the samples of austenitic stainless steel under low-cycle loading and high temperatures of testing. Static and dynamic creep deformations arising under those loading conditions promote an increase in the range of cyclic plastic strain in each loading cycle and also stimulate an increase in the range of elastoplastic strain due to active cyclic deformation. At the same time the existence of dwells on extrema of stresses in cycles without imposition of additional variable stresses on them most strongly affects the growth of plastic strain ranges in cycles. Imposition of additional variable stresses on dwells also results in the development of creep strains, but their growth turns out to be somewhat less than in the presence of dwells without stresses imposed. The diagrams of cyclic deformation obtained in the experiments are approximated by power dependences, their kinetics being described in terms of the number of loading cycles using corresponding temperature-time functions. At the same time, it is shown that increase in the cyclic plastic deformation for cycles with dwells and imposition of additional variable stresses on them decreases low cycle fatigue life compared to regular loading without dwells at the same stress amplitudes, moreover, the higher the values of static and dynamic creep, the greater decrease in low-cycle fatigue life. This conclusion results from experimental data and analysis of conditions of damage accumulation for the considered forms of the loading cycle using the deformation criterion of reaching the limit state leading to fracture.

Damage accumulation near a hole under low cycle fatigue proceeding from measurements of local deformation response

2020 ◽  
Vol 86 (10) ◽  
pp. 46-55
Author(s):  
S. I. Eleonsky ◽  
Yu. G. Matvienko ◽  
V. S. Pisarev ◽  
A. V. Chernov
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Damage Accumulation ◽  
Stress Ratio ◽  
Low Cycle Fatigue ◽  
Accumulation Process ◽  
Stress Range ◽  
Cycle Fatigue ◽  
Deformation Response

A new destructive method for quantitative determination of the damage accumulation in the vicinity of a stress concentrator has been proposed and verified. Increase of damage degree in local area with a high level of the strain gradient was achieved through preliminary low-cycle pull-push loading of plane specimens with central open holes. The above procedure is performed for three programs at the same stress range (333.3 MPa) and different stress ratio values 0.33, – 0.66 and – 1.0, and vice versa for two programs at the same stress ratio – 0.33 and different stress range 333.3 and 233.3 MPa. This process offers a set of the objects to be considered with different degree of accumulated fatigue damages. The key point of the developed approach consists in the fact that plane specimens with open holes are tested under real operation conditions without a preliminary notching of the specimen initiating the fatigue crack growth. The measured parameters necessary for a quantitative description of the damage accumulation process were obtained by removing the local volume of the material in the form of a sequence of narrow notches at a constant level of external tensile stress. External load can be considered an amplifier enhancing a useful signal responsible for revealing the material damage. The notch is intended for assessing the level of fatigue damage, just as probe holes are used to release residual stress energy in the hole drilling method. Measurements of the deformation response caused by local removing of the material are carried out by electronic speckle-pattern interferometry at different stages of low-cycle fatigue. The transition from measured in-plane displacements to the values of the stress intensity factor (SIF) and the T-stress was carried out on the basis of the relations of linear fracture mechanics. It was shown that the normalized dependences of the stress intensity factor on the durability percentage for the first notch (constructed for four programs of cyclic loading with different parameters), reflect the effect of the stress ratio and stress range of the loading cycle on the rate of damage accumulation. The data were used to obtain the explicit form of the damage accumulation function that quantitatively describes damage accumulation process. The functions were constructed for different stress ratios and stress ranges.

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