Evaluation of discrete relaxation-time spectrum in the torsion of a round polymer rod

1974 ◽  
Vol 8 (4) ◽  
pp. 589-594
Author(s):  
I. N. Danilova ◽  
T. V. Sokolova
Keyword(s):  
Relaxation Time ◽  
Time Spectrum ◽  
Relaxation Time Spectrum

Some Aspects of Discrete Relaxation Time Spectra as Obtained from Dynamic Moduli Data

1995 ◽  
Vol 60 (11) ◽  
pp. 1815-1829 ◽  
Author(s):  
Jaromír Jakeš
Keyword(s):  
Relaxation Time ◽  
Least Squares ◽  
Discrete Spectrum ◽  
Integral Transform ◽  
Time Spectrum ◽  
Relaxation Time Spectrum ◽  
Dynamic Moduli ◽  
Best Fitting ◽  
Discrete Spectra ◽  
Well Posed

The problem of finding a relaxation time spectrum best fitting dynamic moduli data in the least-squares sense is shown to be well-posed and to yield a discrete spectrum, provided the data cannot be fitted exactly, i.e., without any deviation of data and calculated values. Properties of the resulting spectrum are discussed. Examples of discrete spectra obtained from simulated literature data and experimental literature data on polymers are given. The problem of smoothing discrete spectra when continuous ones are expected is discussed. A detailed study of an integral transform inversion under the non-negativity constraint is given in Appendix.

Relaxation Time Spectrum, Elasticity, and Viscosity of Rubber. I

1954 ◽  
Vol 27 (1) ◽  
pp. 36-54 ◽  
Author(s):  
W. Kuhn ◽  
O. Künzle ◽  
A. Preissmann
Keyword(s):  
Relaxation Time ◽  
Relaxation Times ◽  
Time Spectrum ◽  
Test Sample ◽  
Elastic Behavior ◽  
Relaxation Processes ◽  
Relaxation Time Spectrum ◽  
Restoring Force ◽  
Constant Length ◽  
Rapid Deformation

Abstract By rapid deformation of a medium in which linear molecules are present, various changes are produced simultaneously in the latter. These changes are more or less independent of one another, and can release independently and totally or partially by rearrangement of valence distances and valence angles in the chain molecules. By virtue of such relaxation processes, a portion of the stress originating in the rapid deformation disappears, with a changing time requirement for the various portions. A relaxation time spectrum is thus formed. The relaxation time spectrum consists of a finite number of restoring force mechanisms with proper relaxation times or of a continuous spectrum. Both the creep curves (the dependence of the length of a body on time at constant load), and stress relaxation (decay of the stress observed in test sample kept at constant length after rapid deformation), as well as the total visco-elastic behavior, especially the behavior at constant periodic deformation of the test sample, are determined by the relaxation time spectrum. The appropriate Quantitative relationships were derived.

Dynamics of the Relaxation-Time Spectrum in a CuMn Spin-Glass

1983 ◽  
Vol 51 (10) ◽  
pp. 911-914 ◽  
Author(s):  
L. Lundgren ◽  
P. Svedlindh ◽  
P. Nordblad ◽  
O. Beckman
Keyword(s):  
Relaxation Time ◽  
Spin Glass ◽  
Time Spectrum ◽  
Relaxation Time Spectrum

The Role of Stochastic Noise on the Glass Transition

1995 ◽  
Vol 407 ◽  
Author(s):  
Fernando C. Perez-Cardenas ◽  
Hao Gan
Keyword(s):  
Relaxation Time ◽  
Glass Transition ◽  
Time Spectrum ◽  
Structure Evolution ◽  
Stochastic Noise ◽  
Relaxation Time Spectrum ◽  
Glass Transition Region ◽  
Type Differential Equation ◽  
Glass Relaxation

ABSTRACTGlasses are amorphous solids that exhibit an intricate structural relaxation. A broad relaxation time spectrum always emerges when these systems are perturbed. By using a Langevin-type differential equation to describe the structure dynamicsof these materials, it is depicted how the broad relaxation time spectrum arises due to the stochastic noise and how this affects the system's structure evolution as it is cooled down into the glass transition region. This stochastic model provides a macroscopic as well a microscopic view of the glass relaxation process.

scholarly journals A revised relaxation-time spectrum for Fennoscandia

1999 ◽  
Vol 139 (1) ◽  
pp. 69-86 ◽  
Author(s):  
K. Wieczerkowski ◽  
J. X. Mitrovica ◽  
D. Wolf
Keyword(s):  
Relaxation Time ◽  
Time Spectrum ◽  
Relaxation Time Spectrum

The relaxation time spectrum of nearly monodisperse polybutadiene melts

1992 ◽  
Vol 31 (1) ◽  
pp. 75-82 ◽  
Author(s):  
M. Baurngaertel ◽  
M. E. De Rosa ◽  
J. Machado ◽  
M. Masse ◽  
H. H. Winter
Keyword(s):  
Relaxation Time ◽  
Time Spectrum ◽  
Relaxation Time Spectrum

scholarly journals Research into the inversion of the induced polarization relaxation time spectrum based on the uniform amplitude sampling method

2016 ◽  
Vol 13 (1) ◽  
pp. 64-76
Author(s):  
Pu Zhang ◽  
Sheng Wang ◽  
Kai-Bo Zhou ◽  
Li Kong ◽  
Hua-Xiu Zeng
Keyword(s):  
Relaxation Time ◽  
Sampling Method ◽  
Time Spectrum ◽  
Induced Polarization ◽  
Relaxation Time Spectrum

A generalized relation between MWD and relaxation time spectrum

2007 ◽  
Vol 47 (5-6) ◽  
pp. 509-519 ◽  
Author(s):  
Maria Rossella Nobile ◽  
Franco Cocchini
Keyword(s):  
Relaxation Time ◽  
Time Spectrum ◽  
Relaxation Time Spectrum
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