Forecasting the experimental glass transition from short time relaxation data

2020 ◽  
Vol 544 ◽  
pp. 120205 ◽  
Author(s):  
Jui-Hsiang Hung ◽  
Tarak K. Patra ◽  
David S. Simmons
Keyword(s):  
Glass Transition ◽  
Relaxation Data ◽  
Time Relaxation ◽  
Experimental Glass ◽  
Short Time

Stress-Temperature Relations in a Pure-Gum Vulcanizate of Natural Rubber

1945 ◽  
Vol 18 (2) ◽  
pp. 367-379 ◽  
Author(s):  
Lawrence A. Wood ◽  
Frank L. Roth
Keyword(s):  
Natural Rubber ◽  
Constant Temperature ◽  
Considerable Importance ◽  
Tabular Form ◽  
Stress Strain ◽  
Time Relaxation ◽  
Relaxation Temperature ◽  
Straight Lines ◽  
Short Time

Abstract Stress-temperature relations at constant elongation have been investigated for a pure-gum vulcanizate of natural rubber. The rubber was first allowed to relax for about two hours at constant elongation and constant temperature to minimize the effects of short time relaxation of stress. The stress, except under special conditions, was changing very little at the end of this time. The stress-temperature relations for temperatures below the relaxation temperature could be represented by straight lines. The values of the slopes and intercepts of these lines are presented in tabular form. The stresses at the end of the relaxations were used as the basis of stress-strain curves. Crystallization was found to be an easily-recognized factor of considerable importance in the interpretation of the results.

On Relaxation Kinetics in Liquid and Glassy Ag-Cu Metallic Alloy

2002 ◽  
Vol 754 ◽  
Author(s):  
Alexander S. Bakai ◽  
Nikolai P. Lazarev ◽  
Kia L. Ngai
Keyword(s):  
Glass Transition ◽  
Short Range ◽  
Kinetic Properties ◽  
Relaxation Kinetics ◽  
Inherent Structure ◽  
Intermediate Time ◽  
Time Region ◽  
The Mean ◽  
Dynamics Simulations ◽  
Short Time

ABSTRACTMolecular dynamics simulations of structure, thermodynamic and kinetic properties of model metallic AgCu alloy are performed to elucidate its behavior at glass transition. In spite of small variations of inherent structure of the alloy the relaxation kinetics undergo dramatic changes at the glass transition. The time dependences of the mean square displacements and the non-Gaussianity parameter show the signatures of anomalous diffusion in an intermediate time region. Analysis of time evolution of van Hove correlation function indicates the existence both jump displacements and short-range cooperative atomic rearrangements. Below Tg these cooperative rearrangements do not contribute to long-range diffusion but they still dominate the relaxation at short time.

scholarly journals Configurational entropy measurements in extremely supercooled liquids that break the glass ceiling

2017 ◽  
Vol 114 (43) ◽  
pp. 11356-11361 ◽  
Author(s):  
Ludovic Berthier ◽  
Patrick Charbonneau ◽  
Daniele Coslovich ◽  
Andrea Ninarello ◽  
Misaki Ozawa ◽  
...  
Keyword(s):  
Glass Transition ◽  
Glass Ceiling ◽  
In Silico ◽  
Configurational Entropy ◽  
Supercooled Liquids ◽  
Numerical Results ◽  
Computational Tools ◽  
Experimental Glass ◽  
Glass State ◽  
Numerical Studies

Liquids relax extremely slowly on approaching the glass state. One explanation is that an entropy crisis, because of the rarefaction of available states, makes it increasingly arduous to reach equilibrium in that regime. Validating this scenario is challenging, because experiments offer limited resolution, while numerical studies lag more than eight orders of magnitude behind experimentally relevant timescales. In this work, we not only close the colossal gap between experiments and simulations but manage to create in silico configurations that have no experimental analog yet. Deploying a range of computational tools, we obtain four estimates of their configurational entropy. These measurements consistently confirm that the steep entropy decrease observed in experiments is also found in simulations, even beyond the experimental glass transition. Our numerical results thus extend the observational window into the physics of glasses and reinforce the relevance of an entropy crisis for understanding their formation.

Short-time relaxation of the critical current in oriented grainedYBa2Cu3Oxand granular (Bi,Pb)2Sr2Ca2Cu3Ox

1990 ◽  
Vol 41 (1) ◽  
pp. 838-841 ◽  
Author(s):  
H. Küpfer ◽  
C. Keller ◽  
R. Meier-Hirmer ◽  
U. Wiech ◽  
K. Salama ◽  
...  
Keyword(s):  
Critical Current ◽  
Time Relaxation ◽  
Short Time

Strain Dependence of the Glass Transition Point in Chlorinated Polyethylene Vulcanizates

1975 ◽  
Vol 48 (4) ◽  
pp. 623-630
Author(s):  
M. Naoki ◽  
T. Nose
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Physical Quantity ◽  
Inflection Point ◽  
Transition Point ◽  
Glass Transition Point ◽  
Chlorinated Polyethylene ◽  
Experimental Glass ◽  
Glass Forming ◽  
Direct Reflection

Abstract The experimental glass transition temperature observed as the inflection point in a certain physical quantity, Tgapp, changes not only with glass-forming conditions but also with the variables observed. Moreover the change of Tgapp with extension largely depends on the variables observed. These results indicate that Tgapp as determined by measurement of a certain physical quantity is not necessarily a direct reflection of the molecular mobility.

CRITICAL SHORT-TIME DYNAMICS IN LATTICE GAUGE THEORY

2006 ◽  
Vol 17 (01) ◽  
pp. 1-13 ◽  
Author(s):  
TSUYOSHI OTOBE ◽  
KEISUKE OKANO
Keyword(s):  
Gauge Theory ◽  
Critical Temperature ◽  
Critical Point ◽  
Critical Exponents ◽  
Lattice Gauge Theory ◽  
Time Relaxation ◽  
Time Dynamics ◽  
Lattice Gauge ◽  
Time Scaling ◽  
Short Time

We investigated a critical short-time relaxation in a lattice gauge theory. A systematic procedure of estimating critical point based on the "short-time scaling" is formulated. It is applied to the (2+1)-dimensional SU(2) lattice gauge theory at finite temperature to deduce its critical point. Finally, we studied the short-time relaxation behavior at the critical temperature starting either from "cold" and "hot" initial configuration, and calculated the dynamic critical exponents θ and z, as well as the static exponents β/ν.

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