Relaxation strength of E1612 and 20Kh1M1F1 steels during tension and failure

1962 ◽  
Vol 4 (3-4) ◽  
pp. 137-141 ◽  
Author(s):  
L. Ya. Liberman
Keyword(s):  
Relaxation Strength

Slow Dynamics Due to the Metal-Nonmetal Transition in Liquids

2003 ◽  
Vol 217 (7) ◽  
pp. 803-816 ◽  
Author(s):  
Makoto Yao ◽  
Hirotaka Kohno ◽  
Hiroaki Kajikawa
Keyword(s):  
Relaxation Time ◽  
Glass Transition ◽  
Liquid Glass ◽  
Sound Attenuation ◽  
Slow Dynamics ◽  
Anomalous Increase ◽  
Relaxation Strength ◽  
Transition Range ◽  
Liquid Dynamics ◽  
Nonmetal Transition

AbstractIt is well known that the liquid dynamics slows down on approaching the liquid-gas critical point or the liquid-glass transition. Recently we have found by the sound attenuation measurements that the metal-nonmetal (M-NM) transition also induces slow dynamics. In the M-NM transition range of expanded liquid Hg, we have observed anomalous increase in the sound attenuation due to the structural relaxation process. Assuming a simple Debye-type relaxation, we have estimated that the relaxation time should be of the order of nanoseconds and revealed that the relaxation strength has a broad maximum in the M-NM transition range. Moreover, two types of anomalies have been observed also in the semiconductor-metal (S-M) transition range of liquid Te-Se mixtures. We present the recent experimental results of the sound attenuation measurements and discuss briefly the mechanisms of the slow dynamics in the metal-nonmetal transition range of liquids.

scholarly journals Curie-Weiß Temperature Dependence Of Paraelasticity

1971 ◽  
Vol 26 (3) ◽  
pp. 588-590
Author(s):  
J. Tretkowski ◽  
J. Völkl ◽  
G. Alefeld
Keyword(s):  
Temperature Dependence ◽  
Critical Point ◽  
Relaxation Strength ◽  
Weiss Temperature ◽  
Elastic Strains

Abstract Anelastic strains exceeding elastic strains up to a factor of 30 have been observed close to the critical point of H in Nb. The temperature dependence of the relaxation strength follows a Curie-Weiß law for temperatures (T - Tc)/Tc ≥ 6-10-3.

On the Assessment of Dielectric Relaxation Parameters of Liquids

1986 ◽  
Vol 41 (8) ◽  
pp. 1060-1070 ◽  
Author(s):  
A.-H. Beine ◽  
E. Dachwitz ◽  
L. Wodniok ◽  
M. Stockhausen
Keyword(s):  
Dielectric Relaxation ◽  
Spectral Component ◽  
Molecular Size ◽  
Rotational Relaxation ◽  
Static Permittivity ◽  
Relaxation Strength ◽  
Relaxation Parameters ◽  
The Moment ◽  
Theoretical Considerations ◽  
Rotational Relaxation Time

In an attempt to outline roughly the "normal” dielectric relaxation behaviour of polar liquids as a reference for the investigation of more complex (e.g. associating) systems, some theoretical considerations and experimental results (mainly on two component mixtures) are presented. They show that for a distinct spectral component a simple equation can be used which approximately relates the relaxation strength to the moment of the relaxing moiety. The rotational relaxation time is practically not affected by the static permittivity but is correlated to the molecular size and the macroscopic viscosity, thus allowing for conclusions on the effective radius of the tumbling moieties.

Theory of the zener relaxation strength. I

Physica ◽  
1971 ◽  
Vol 52 (3) ◽  
pp. 410-421 ◽  
Author(s):  
C.M. Van Baal
Keyword(s):  
Relaxation Strength

Grain Boundary Relaxation in a Fe-Cr-Al Alloy

2011 ◽  
Vol 415-417 ◽  
pp. 2134-2137
Author(s):  
Zheng Cun Zhou ◽  
Q. Z. Wang ◽  
J. Du ◽  
H. Yang ◽  
Y.J. Yan
Keyword(s):  
Activation Energy ◽  
Grain Size ◽  
Internal Friction ◽  
Grain Boundary ◽  
Relaxation Peak ◽  
Al Alloy ◽  
Relaxation Strength ◽  
Exponential Factor ◽  
Friction Temperature ◽  
Boundary Relaxation

The features of grain boundary relaxation of a (wt.%)Fe-25Cr-5Al alloy have been investigated using a multifunction internal friction apparatus. The grain boundary relaxation peak appears at about 630oC on the internal friction-temperature curves for the alloy. The peak temperature shifts toward high temperature with increasing frequency. In terms of Arrihenius relation, the activation energy is calculated to be 4.07(±0.15)eV and the pre-exponential factor is 6.2×10-24±1s. Grain boundary relaxation strength remarkably decreases with increasing grain size. When grain size reaches 520μm, the grain boundary relaxation peak almost disappears.

scholarly journals Viscoelastic Behaviour from Complementary Forced-Oscillation and Microcreep Tests

Minerals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 721
Author(s):  
Ian Jackson
Keyword(s):  
Forced Oscillation ◽  
Relaxation Times ◽  
Experimental Methods ◽  
Creep Function ◽  
Relaxation Strength ◽  
Composite Modulus ◽  
Frequency Domains ◽  
New Strategy ◽  
Function Models ◽  
Transient And Steady State

There is an important complementarity between experimental methods for the study of high-temperature viscoelasticity in the time and frequency domains that has not always been fully exploited. Here, we show that the parallel processing of forced-oscillation data and microcreep records, involving the consistent use of either Andrade or extended Burgers creep function models, yields a robust composite modulus-dissipation dataset spanning a broader range of periods than either technique alone. In fitting this dataset, the alternative Andrade and extended Burgers models differ in their partitioning of strain between the anelastic and viscous contributions. The extended Burgers model is preferred because it involves a finite range of anelastic relaxation times and, accordingly, a well-defined anelastic relaxation strength. The new strategy offers the prospect of better constraining the transition between transient and steady-state creep or, equivalently, between anelastic and viscous behaviour.

scholarly journals Acoustical Studies of Some Derivatives of 1,5-Benzodiazepines at 298.15 K

2014 ◽  
Vol 38 ◽  
pp. 132-142 ◽  
Author(s):  
Shipra Baluja ◽  
Nilesh Godvani
Keyword(s):  
Free Path Length ◽  
Isentropic Compressibility ◽  
Dimethyl Formamide ◽  
Solvation Number ◽  
Mass Spectral Data ◽  
Acoustical Parameters ◽  
Relaxation Strength ◽  
Mass Spectral ◽  
Derivatives Of ◽  
Structural Characterizations

Some new derivatives of 1,5-Benzodiazepines have been synthesized and their structural characterizations are done by IR, NMR and Mass Spectral data. The ultrasonic velocity, density and viscosity of these synthesized compounds have been measured in dimethyl formamide and tetrahydrofuran at 298.15 K. From these experimental data, some acoustical parameters such as isentropic compressibility, intermolecular free path length, Rao’s molar sound function, relaxation strength, solvation number etc., have been calculated which helps in understanding the molecular interactions occurring in these solutions.

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