Kinetics and fractography of fatigue failure of 15Kh2MFA steel at low temperatures

1984 ◽  
Vol 26 (12) ◽  
pp. 881-883
Author(s):  
L. R. Botvina ◽  
G. V. Klevtsov ◽  
A. I. Cherepanov ◽  
V. M. Markochev ◽  
A. P. Bobrinskii
Keyword(s):  
Fatigue Failure ◽  
Low Temperatures ◽  
15Kh2mfa Steel

Fatigue failure at low temperatures

2017 ◽  
Vol 37 (10) ◽  
pp. 866-873 ◽  
Author(s):  
Yu. G. Kabaldin ◽  
M. S. Anosov ◽  
D. A. Shatagin ◽  
D. V. Sidorenkov ◽  
A. A. Golovin ◽  
...  
Keyword(s):  
Fatigue Failure ◽  
Low Temperatures

Correlation between cyclic plastic strain zone size and the fatigue fracture rate of 15Kh2MFA steel at low temperatures

1982 ◽  
Vol 14 (7) ◽  
pp. 887-891
Author(s):  
L. R. Botvina ◽  
G. V. Klevtsov ◽  
V. M. Markochev ◽  
A. P. Bobrinskii
Keyword(s):  
Plastic Strain ◽  
Fatigue Fracture ◽  
Low Temperatures ◽  
Fracture Rate ◽  
Zone Size ◽  
Cyclic Plastic ◽  
15Kh2mfa Steel ◽  
Cyclic Plastic Strain ◽  
Plastic Strain Zone

Influence of crack closure and loading cycle asymmetry on kinetic fatigue failure curves at normal and low temperatures

1987 ◽  
Vol 23 (3) ◽  
pp. 285-289
Author(s):  
O. P. Ostash ◽  
V. T. Zhmur-Klimenko ◽  
E. M. Kostyk ◽  
A. B. Kunovskii
Keyword(s):  
Crack Closure ◽  
Fatigue Failure ◽  
Low Temperatures ◽  
Cycle Asymmetry ◽  
Loading Cycle

Fatigue failure of copper at low temperatures

1971 ◽  
Vol 13 (10) ◽  
pp. 875-877 ◽  
Author(s):  
N. M. Grinberg ◽  
L. F. Yakovenko ◽  
I. M. Lyubarskii
Keyword(s):  
Fatigue Failure ◽  
Low Temperatures

Development of fatigue failure of low-carbon sheet steel at room and low temperatures

1977 ◽  
Vol 9 (3) ◽  
pp. 266-272 ◽  
Author(s):  
S. Ya. Yarema ◽  
A. Ya. Krasovskii ◽  
O. P. Ostash ◽  
V. A. Stepanenko
Keyword(s):  
Fatigue Failure ◽  
Low Temperatures ◽  
Sheet Steel ◽  
Low Carbon ◽  
Carbon Sheet

scholarly journals Implementation of a cooling system to develop experimental fatigue tests below zero grades Celsius

2020 ◽  
Vol 25 (4) ◽  
pp. 519-525
Author(s):  
Carlos Gerardo Cárdenas Arias ◽  
Camilo Leonardo Sandoval Rodríguez ◽  
Arly Darío Rincón Quintero ◽  
Pablo David Díaz Melo
Keyword(s):  
Heat Transfer ◽  
Fatigue Test ◽  
Fatigue Failure ◽  
Low Temperatures ◽  
Initial Temperature ◽  
Cooling System ◽  
Fatigue Tests ◽  
Sample Material ◽  
Industrial Level ◽  
Materials Behavior

Temperature is one of the matter properties with the greatest influence on the materials behavior existing in nature and those man designed. This physical magnitude allows to demonstrate and define behaviors and materials characteristics in the industry in general. Its influence is present in all the places where the materials fulfill functions, however, in some applications its influence is very little, which allows to disregard its effects. In the steels case (one of the most used materials at the industrial level today), the temperature variation produces dilation or contraction, depending on the temperature magnitude and its variation that affects them. Temperature increases generate an expansion phenomenon in the materials, which under load will reach a point where they present thermal fatigue failure. The opposite is that of temperature drops, where the phenomenon that occurs is contraction, often leading to the loss of adjustments and interference that compromise the equipment functionality and integrity. The fatigue failure mentioned is presented as a result of the stresses and deformations present in both cases. It is desired to condition a rotational flex fatigue test equipment with a cooling system to bring the sample material to temperatures below zero degrees Celsius, in order to check how low temperatures, affect the resistance of steel to fatigue. For this, a cooling system was designed and the fatigue equipment was adapted to reduce heat transfer. After carrying out this implementation and determining that the sizes of the devices were suitable for the proposed purposes, the initial temperature tests were carried out and, once this part was achieved, three repetitions of a rotary fatigue test were performed that demonstrated that the equipment can operate normally.

Interpretation of irradiation-induced changes in electron diffractograms and images of extinction contours at low temperatures

1984 ◽  
Vol 42 ◽  
pp. 268-269
Author(s):  
E. Knapek ◽  
H. Formanek ◽  
G. Lefranc ◽  
I. Dietrich
Keyword(s):  
Low Temperatures ◽  
Carbon Films ◽  
Organic Crystals ◽  
Wide Spread ◽  
Lens System ◽  
Preparation Conditions ◽  
Thin Carbon ◽  
Electron Diffractograms ◽  
Diffraction Patterns ◽  
Induced Changes

A few years ago results on cryoprotection of L-valine were reported, where the values of the critical fluence De i.e, the electron exposure which decreases the intensity of the diffraction reflections by a factor e, amounted to the order of 2000 + 1000 e/nm2. In the meantime a discrepancy arose, since several groups published De values between 100 e/nm2 and 1200 e/nm2 /1 - 4/. This disagreement and particularly the wide spread of the results induced us to investigate more thoroughly the behaviour of organic crystals at very low temperatures during electron irradiation.For this purpose large L-valine crystals with homogenuous thickness were deposited on holey carbon films, thin carbon films or Au-coated holey carbon films. These specimens were cooled down to nearly liquid helium temperature in an electron microscope with a superconducting lens system and irradiated with 200 keU-electrons. The progress of radiation damage under different preparation conditions has been observed with series of electron diffraction patterns and direct images of extinction contours.

Radiation Damage of Support Films

1981 ◽  
Vol 39 ◽  
pp. 28-29
Author(s):  
H.A. Cohen ◽  
W. Chiu
Keyword(s):  
Transfer Function ◽  
Low Temperatures ◽  
Carbon Support ◽  
Contrast Transfer Function ◽  
Electron Dose ◽  
Imaging Parameters ◽  
Negative Stain ◽  
Phase Corrections ◽  
Two Parameters ◽  
Medium Dose

The goal of imaging the finest detail possible in biological specimens leads to contradictory requirements for the choice of an electron dose. The dose should be as low as possible to minimize object damage, yet as high as possible to optimize image statistics. For specimens that are protected by low temperatures or for which the low resolution associated with negative stain is acceptable, the first condition may be partially relaxed, allowing the use of (for example) 6 to 10 e/Å2. However, this medium dose is marginal for obtaining the contrast transfer function (CTF) of the microscope, which is necessary to allow phase corrections to the image. We have explored two parameters that affect the CTF under medium dose conditions.Figure 1 displays the CTF for carbon (C, row 1) and triafol plus carbon (T+C, row 2). For any column, the images to which the CTF correspond were from a carbon covered hole (C) and the adjacent triafol plus carbon support film (T+C), both recorded on the same micrograph; therefore the imaging parameters of defocus, illumination angle, and electron statistics were identical.

In situ Tensile Experiments at Low Temperatures on Niobium Single Crystals by H.V.E.M.

1975 ◽  
Vol 33 ◽  
pp. 58-59
Author(s):  
F. H. Louchet ◽  
L. P. Kubin
Keyword(s):  
Electron Microscope ◽  
Transition Temperature ◽  
Low Temperature ◽  
Slip System ◽  
Low Temperatures ◽  
Tensile Axis ◽  
Image Intensifier ◽  
Screw Dislocations ◽  
Source Operation

Experiments have been carried out on the 3 MeV electron microscope in Toulouse. The low temperature straining holder has been previously described Images given by an image intensifier are recorded on magnetic tape.The microtensile niobium samples are cut in a plane with the two operative slip directions [111] and lying in the foil plane. The tensile axis is near [011].Our results concern:- The transition temperature of niobium near 220 K: at this temperature and below an increasing difference appears between the mobilities of the screw and edge portions of dislocations loops. Source operation and interactions between screw dislocations of different slip system have been recorded.

Ultrastructure of the soil fungus, Geomyces pannorus

1984 ◽  
Vol 42 ◽  
pp. 738-739
Author(s):  
J. A. Traquair ◽  
E. G. Kokko
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fine Structure ◽  
Low Temperatures ◽  
Soil Fungus ◽  
Organic Soils ◽  
Anatomical Studies ◽  
Transmission Electron ◽  
Electron Microscopical ◽  
Scanning Electron

With the advent of improved dehydration techniques, scanning electron microscopy has become routine in anatomical studies of fungi. Fine structure of hyphae and spore surfaces has been illustrated for many hyphomycetes, and yet, the ultrastructure of the ubiquitous soil fungus, Geomyces pannorus (Link) Sigler & Carmichael has been neglected. This presentation shows that scanning and transmission electron microscopical data must be correlated in resolving septal structure and conidial release in G. pannorus.Although it is reported to be cellulolytic but not keratinolytic, G. pannorus is found on human skin, animals, birds, mushrooms, dung, roots, and frozen meat in addition to various organic soils. In fact, it readily adapts to growth at low temperatures.

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