Results 271 to 280 of about 35,679 (298)

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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Stress Relaxation and Tensile Modulus of Polymeric Fibers

Textile Research Journal, 1991
With increasingly diversified demands on the mechanical properties of polymeric fibers, the question of whether properties can be varied independently or are related has become imperative. This report is concerned with the relation between tensile modulus and stress relaxation.
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On the nature of the shear viscosity and shear modulus relaxation in metallic glasses

Journal of Physics: Condensed Matter, 2013
Analysis of independent isothermal and linear heating creep and shear modulus measurements performed on bulk Pd- and Zr-based metallic glasses provides evidence that the relaxation of their viscoelastic and elastic properties is controlled by 'defects', which respond to stress and temperature similarly to dumbbell interstitials in simple crystalline ...
A N, Tsyplakov, V A, Khonik, A S, Makarov, Yu P, Mitrofanov, G V, Afonin, N P, Kobelev, R A, Konchakov, A V, Lysenko   +7 more
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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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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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Calculation of discrete relaxation modulus and creep compliance

Rheologica Acta, 1999
Muntz theorems from classical approximation theory are used to lay the mathematical foundations for discrete spectral representations of the relaxation modulus and creep conpliance. Algorithms that can automatically generate nonnegative discrete relaxation and retardation strengths are formulated by using the nonnegative least square method.
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Evidence of Distributed Interstitialcy-Like Relaxation of the Shear Modulus due to Structural Relaxation of Metallic Glasses

Physical Review Letters, 2008
The interstitialcy theory is used to calculate the kinetics of shear modulus relaxation induced by structural relaxation of metallic glasses. A continuous distribution of activation energies is shown to be a salient feature of the relaxation.
S V, Khonik, A V, Granato, D M, Joncich, A, Pompe, V A, Khonik   +4 more
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Determination of Young's Modulus Under Conditions of Relaxation

1957
Equipment for the determination of Young's modulus is described, and methods for obtaining improved axial alignment are recommended. Statistical analyses show the effect of five methods of gripping specimens on the apparent Young's modulus and the degree of misalignment.
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STRUCTURAL RELAXATION OF Cu67Ti33 MONITORED BY ELASTIC MODULUS

1985
Elastic modulus and internal friction of Cu67Ti33 metallic glass were measured by means of the vibrating-reed technique. Structural relaxation and crystallization were studied in situ during a stepwise annealing treatment from room temperature up to 700 K.
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Development of a tensile relaxation modulus test for identifying the tensile relaxation spectrum of asphalt binder

Construction and Building Materials, 2023
Yuhong Wang
exaly