Method of automatic measurement of the length of a fatigue crack in crack resistance tests of materials in air and in sprayed solutions

1982 ◽  
Vol 17 (6) ◽  
pp. 505-509 ◽  
Author(s):  
A. M. Dotsenko
Keyword(s):  
Fatigue Crack ◽  
Crack Resistance ◽  
Automatic Measurement ◽  
Resistance Tests

Measurement Fitness of Samples for Fatigue Crack Resistance Tests

Atomic Energy ◽  
2015 ◽  
Vol 118 (2) ◽  
pp. 108-116 ◽  
Author(s):  
V. Yu. Gol’tsev ◽  
V. M. Markochev
Keyword(s):  
Fatigue Crack ◽  
Crack Resistance ◽  
Resistance Tests

Stressed state of a square sample for crack resistance tests of sheet materials

1982 ◽  
Vol 18 (3) ◽  
pp. 240-244 ◽  
Author(s):  
M. P. Savruk ◽  
S. Ya. Yarema ◽  
P. N. Osiv
Keyword(s):  
Stressed State ◽  
Crack Resistance ◽  
Sheet Materials ◽  
Resistance Tests

Modeling of the ductile-brittle transition in porous metallic materials under conditions of crack resistance tests

1990 ◽  
Vol 29 (5) ◽  
pp. 411-416 ◽  
Author(s):  
S. A. Firstov ◽  
Yu. N. Podrezov ◽  
L. G. Shtyka ◽  
A. G. Zherdin ◽  
A. A. Malyshenko
Keyword(s):  
Crack Resistance ◽  
Metallic Materials ◽  
Brittle Transition ◽  
Resistance Tests

Fatigue crack resistance of crankshafts

1983 ◽  
Vol 15 (5) ◽  
pp. 652-655
Author(s):  
A. V. Prokopenko ◽  
M. N. Sultani ◽  
V. V. Khil'chevskii ◽  
V. N. Ezhov ◽  
Yu. M. Shemegan
Keyword(s):  
Fatigue Crack ◽  
Crack Resistance

Origin of two linear segments in the fracture diagram in crack resistance tests

1981 ◽  
Vol 13 (8) ◽  
pp. 980-984
Author(s):  
V. A. Volkov ◽  
A. S. Dukhovnyi
Keyword(s):  
Crack Resistance ◽  
Fracture Diagram ◽  
Resistance Tests

scholarly journals EVALUATION OF CHARACTERISTICS OF RESISTANCE OF PROPAGATION OF CORROSION- FATIGUE CRACKS OF LONG-TERM OPERATED DRILL PIPES

2021 ◽  
pp. 111-122
Author(s):  
О. Yu. Vytyaz ◽  
R. S. Hrabovskyi
Keyword(s):  
Fatigue Crack ◽  
Crack Resistance ◽  
Corrosion Fatigue ◽  
Fatigue Cracks ◽  
Drill String ◽  
Drilling Mud ◽  
Corrosion Fatigue Crack ◽  
Corrosion Crack Resistance ◽  
Fatigue Crack Development

The aim of the proposed article is to determine the patterns of the corrosion-fatigue cracks in long-term operational metal elements of drill strings (steel 45, 36G2S, 40HN) when drilling wells in corrosive environments (drilling fluid "Biocar", potassium polymer mud and on the air). Based on the obtained results of experimental studies, diagrams of cyclic corrosion crack resistance for the studied systems "metal - medium" were drawn. The cyclic crack resistance characteristics of long-used metals of drill string elements are determined - the values of constants (C and n) in power dependence of Paris, as well as the values of threshold and critical stress intensity factory. The influence of drilling mud of the corrosion crack resistance of the investigated metals of drill string elements was estimated quantitatively. In particular, in the environment of drilling mud "Biocar" the process of corrosion-fatigue crack development in the studied metals of the elements of drill strings is not significantly, in the range of 1-5%, differs from the development of fatigue crack on the air. Whereas in the potassium polymer drilling mud media, the rate of corrosion-fatigue cracks development in the investigated metals of the drill strings elements significantly, in the range of 15-35%, differs from the development of fatigue cracks on the air. It is established that under the influence of working loads the process of the corrosion-fatigue crack development in long-operated elements of drilling string is accelerated by more than 10% in the media of the potassium polymeric drilling mud than in the environment of drilling mud "Biocar".

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