Results 271 to 280 of about 203,665 (317)

Time-temperature superposition principle and scaling behaviour

Journal of Materials Science, 1987
The time-temperature superposition principle, frequently used to describe the mechanical and electrical relaxation behaviour of polymers, is considered within the more general concept of scaling with translation path parallel to the abscissa. The most general functions leading to scaling with translation path parallel to the horizontal axis are given ...
F. Povolo, M. Fontelos
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AUTOMATED SHIFT FOR TIME-TEMPERATURE SUPERPOSITION

1999
Time-temperature superposition has been used for long-term structural durability design with short-term accelerating tests at elevated temperatures. Knowledge of a master curve at a specific reference temperature along with time-temperature shift factors serves to completely characterize the material or the failure properties across an enormous ...
Sangwook Sihn, Stephen W. Tsai
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Time-temperature superposition for partially crystalline polymers (polytetrafluoroethylene)

Polymer Mechanics, 1976
Time-temperature superposition in the\(\mathop \varepsilon \limits^.\) = const regime can be applied to partially crystalline fluoroplastics with different specific volumes. There is a correlation between the variation of the specific volume and the relaxation processes in fluoroplastics.
A. Ya. Gol'dman, A. N. Grinman, Yu. F. Dunichev   +2 more
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Fractional relaxation and the time-temperature superposition principle

Rheologica Acta, 1994
Relaxation processes in complex systems like polymers or other viscoelastic materials can be described by equations containing fractional differential or integral operators. In order to give a physical motivation for fractional order equations, the fractional relaxation is discussed in the framework of statistical mechanics.
W. G. Gl�ckle, T. F. Nonnenmacher
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Time-Temperature Superposition

2016
This chapter consists of three sections: the fundamentals, the geometric interpretation, and the algorithms of time-temperature superposition. The first section deals with the phenomenology, mathematical formulas, models for horizontal shift factor, and molecular explanation of time-temperature superposition.
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Time ? Temperature superposition for thermorheologically complex materials

Polymer Mechanics, 1975
The shift factoraT for thermorheologically complex bodies is a function not only of temperature T but also of the deformation time t. A method is given for determining the vertical shift factor on the basis of macro-tests within the experimental time window.
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Creep of Geotextiles Using Time–Temperature Superposition Methods

Journal of Geotechnical and Geoenvironmental Engineering, 2004
The objective of this study is to evaluate the creep deformations, creep failure, and residual tensile strength of geosynthetics using accelerated time-temperature procedures and procedures consistent with rapid tensile testing. The study proposes new definitions for the quantification of creep, of creep failure, and of the reference strength for ...
Jorge G. Zornberg, Brett R. Byler, Justin W. Knudsen   +2 more
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Time-temperature superposition for block copolymers

1971
The proposition is made that simple time-temperature superposition should not be valid for block copolymers exhibiting multiple mechanical transitions; and an explanation of the time temperature behavior, which is more consistent with the behavior of the individual phases, is presented in terms of an equivalent mechanical model.
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Time-temperature superposition and linear viscoelasticity of polybutadienes

Macromolecules, 1995
A series of monodisperse polybutadienes has been used to perform mechanical relaxation measurements from the flow regime to the glassy state. Results on loss shear moduli have been analyzed within the framework of a coupling model. It has been found to represent well the frequency dependence in the glassy and terminal zones using a segmental motion ...
Palade, L., Verney, Vincent, Attané, P.
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Time-Temperature Superposition in Heterophase Block Copolymers

1973
The viscoelastic behavior of a styrene-butadiene-styrene block copolymer cast from several different solvents was studied in order to examine the validity of the time-temperature superposition principle in heterophase polymers. It is found that stress-relaxation isotherms over a wide temperature range can be easily superposed into smooth master curves.
A. Kaya, G. Choi, M. C. Shen
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