Results 221 to 230 of about 27,965 (266)

Exact computation of creep compliance and relaxation modulus from complex modulus measurement data

Mechanics of Materials, 2008
Abstract It is well-known that for a linear viscoelastic material, there is a relationship between the complex modulus, the creep function and the relaxation modulus. It should be sufficient to collect one of these functions by a measurement to obtain the two other functions. However, this process seems to be rarely used.
J.-M. Parot, B. Duperray
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Creep and stress-relaxation in ultra-high modulus linear polyethylene

Journal of Materials Science, 1984
It has been shown that the creep and stress-relaxation behaviour of oriented linear polyethylene can be satisfactorily described by a model where two thermally activated processes are acting in parallel. The creep behaviour of an oriented sample which does not reach a constant strain-rate can be described by the addition of a further plastic flow term ...
Wilding, M. A., Ward, I. M.
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From dynamic modulus via different relaxation spectra to relaxation and creep functions

Rheologica Acta, 2001
The main goal of the paper is to compare predictive power of relaxation spectra found by different methods of calculations. The experimental data were obtained for a new family of propylene random copolymers with 1-pentene as a comonomer. The results of measurements include flow curves, viscoelastic properties, creep curves and rubbery elasticity of ...
Alexander Ya. Malkin, Irima Masalova
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Evaluation of the stress-relaxation modulus for materials with rapid relaxation rates

Journal of Applied Physics, 1980
The stress-relaxation modulus E(t) is defined in terms of an experiment involving an instantaneously applied strain; such experiments are, in practice, impossible. We have critically investigated several methods which have been suggested in the literature to extract E(t) from experimental stress values used to bring about a constant-strain rate ...
K. S. C. Lin, J. J. Aklonis
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Similarity of the relaxation modulus of polydisperse polymers

Makromolekulare Chemie. Macromolecular Symposia, 1993
AbstractA similarity rule due to Markovitz is used for the correlation of the relaxation modulus for different polymeric materials. This rule has long been employed implicitly in the empirical shifting rules for the reduction to common curves of viscoelastic data measured on the same polymer over a range of temperatures and concentrations.
Bruce Caswell, Stephen J. Paboojian
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Analysis of the Relaxation Modulus of Spun Yarns

Textile Research Journal, 2009
In this paper, the relaxation modulus of a single spun yarn is modeled in terms of the relaxation modulus of the constituent fibers of the yarn. A generalized Maxwell model is employed to describe the viscoelastic characteristic function of individual fibers subject to a given step function of tensile strain.
H. Liu, X.M. Tao, K.F. Choi, B.G. Xu
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Variable range hopping and modulus relaxation in NiFe2O4 ceramics

Materials Chemistry and Physics, 2021
Abstract Nickel ferrite ceramics prepared from combustion derived powders have been investigated using dielectric, impedance, and modulus spectroscopy over a wide frequency (0.1 Hz–1 MHz) and temperature range (173–473 K). Step-like dielectric response e ' T , f is related to the surface barrier layer capacitor (SBLC) effect ...
Lalita Chauhan, Sudhanshu Kumar, K. Sreenivas, A.K. Shukla   +3 more
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RELAXATION OF ELASTIC MODULUS AFTER COLD-ROLLING

1985
The structural relaxation after cold-rolling (30%) of Metglas 2826A (Fe32Ni36Cr14P12B6) was measured by means of elastic modulus and internal friction in a vibrating-reed system during stepwise annealing. Relaxation occurs already at room temperature and increases Young's modulus up to 160 °C. At higher temperatures the effect changes its sign. It will
Klaus BOTHE, Hartmut NEUHÄUSER
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Fitting methods for relaxation modulus of viscoelastic materials

Journal of Central South University of Technology, 2007
Based on viscoelastic theory, two new computational methods of solving linear equations and minimum value of the 1-norm were put forward for transforming Kohlrausch-William-Watts (KWW) function of viscoelastic materials to the generalized Maxwell model. The computational methods for the Maxwell model fitting were achieved in MATLAB software.
Ji-an Duan, Cheng-ling Yang, Ci-jun Shuai   +2 more
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Relaxation of young modulus by thermal treatment in metglas ribbons

Il Nuovo Cimento D, 1985
The Young modulus dependence on thermal treatment and magnetization state was analysed on various metallic glasses. Propagation of standing magnetoelastic waves was used as an investigation technique. A simple model was elaborated to predict the magnetoelastic coupling.
LANOTTE, LUCIANO, C. LUPONIO, F. PORRECA
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