scholarly journals Mechanical Behaviour of Commercial Aluminium Wrought Alloys at Low Temperatures

10.5772/58362 ◽  
2014 ◽  
Author(s):  
Robert Schneider ◽  
Burkhard Heine ◽  
Richard J. Grant
Keyword(s):  
Mechanical Behaviour ◽  
Low Temperatures ◽  
Commercial Aluminium

Constitutive flow curve approximation of commercial aluminium alloys at low temperatures

2015 ◽  
Vol 88 ◽  
pp. 659-666 ◽  
Author(s):  
R. Schneider ◽  
R.J. Grant ◽  
N. Sotirov ◽  
G. Falkinger ◽  
F. Grabner ◽  
...  
Keyword(s):  
Aluminium Alloys ◽  
Low Temperatures ◽  
Flow Curve ◽  
Curve Approximation ◽  
Commercial Aluminium

Analysis of the mechanical behaviour of bituminous mixtures at low temperatures

2013 ◽  
Vol 46 ◽  
pp. 193-202 ◽  
Author(s):  
Félix Pérez-Jiménez ◽  
Ramón Botella ◽  
Adriana H. Martínez ◽  
Rodrigo Miró
Keyword(s):  
Mechanical Behaviour ◽  
Low Temperatures ◽  
Bituminous Mixtures

scholarly journals Analysis of mechanical behaviour of AA6082-T6 sheets deformed at low temperatures

2019 ◽  
Vol 29 ◽  
pp. 435-442 ◽  
Author(s):  
Stefania Bruschi ◽  
Rachele Bertolini ◽  
Enrico Simonetto ◽  
Andrea Ghiotti
Keyword(s):  
Mechanical Behaviour ◽  
Low Temperatures

scholarly journals Evaluation of bituminous sub-ballast manufactured at low temperatures as an alternative for the construction of more sustainable railway structures

2017 ◽  
Vol 7 (080) ◽  
pp. 128 ◽  
Author(s):  
L. Pirozzolo ◽  
M. Sol-Sánchez ◽  
F. Moreno-Navarro ◽  
G. Martínez-Montes ◽  
M. C. Rubio-Gámez
Keyword(s):  
Energy Consumption ◽  
Bearing Capacity ◽  
Production Process ◽  
Mechanical Behaviour ◽  
Low Temperatures ◽  
Loading Conditions ◽  
Construction Costs ◽  
Bituminous Mixtures ◽  
Reduce Emissions ◽  
Save Energy

Hot bituminous mixtures are becoming widely used in modern railway tracks in the sub-ballast layer. The reason is that these materials allow for both an increase in bearing capacity and greater protection of the substructure respect the traditional granular sub-ballast. Despite these advantages, the fact that these materials are manufactured at a temperature of 160°C means that their application can lead to an important increase in construction costs, pollution and energy consumption. This paper aims to study the possibility of using WMA manufactured at lower temperatures, as bituminous sub-ballast, in order to save energy and reduce emissions throughout the production process, as well as diminish the global costs of this layer. To this end, this study focuses on a comparison of the mechanical behaviour of warm and hot bituminous mixtures as sub-ballast under various loading conditions. The results indicate that WMA offers mechanical behaviour that is comparable to conventional HMA.

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.

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