Mechanical behavior of calcified plaques: a summary of compression and stress-relaxation experiments

2000 ◽  
Vol 89 (14) ◽  
pp. S085-S091 ◽  
Author(s):  
L.D.T. Topoleski ◽  
N.V. Salunke
Keyword(s):  
Stress Relaxation ◽  
Mechanical Behavior ◽  
Relaxation Experiments

Study of the Viscoelastic Behavior and Molecular Weight Distribution of Polyisobutylene

1954 ◽  
Vol 27 (2) ◽  
pp. 393-414
Author(s):  
Kensal E. Van Holde ◽  
J. W. Williams
Keyword(s):  
Molecular Weight ◽  
Experimental Investigation ◽  
Stress Relaxation ◽  
Mechanical Behavior ◽  
Weight Distribution ◽  
Viscoelastic Behavior ◽  
Elastic Behavior ◽  
High Polymer ◽  
Relaxation Experiments ◽  
Mechanical Studies

Abstract The viscoelastic behavior of linear high polymers has commanded considerable attention in recent years. The very thorough studies by Fox and Flory of the melt viscosity of polystyrene and polyisobutylene, the stress relaxation experiments of Tobolsky and coworkers, and dynamic-mechanical studies by Ferry have contributed greatly to our knowledge of the mechanical behavior of these interesting substances. However, there are many facets of this subject which have not received thorough experimental investigation. In particular, there has been no detailed study of the effect of molecular weight and polydispersity on the elastic behavior of viscoelastic materials. It was felt, therefore, that a study of the viscoelastic behavior of a series of very carefully characterized samples of a representative linear high polymer would contribute substantially to the understanding of this subject. The polymer chosen was polyisobutylene, which displays both flow and elastic behavior at room temperatures.

Analysis of stress relaxation in the nonlinear region of mechanical behavior

2009 ◽  
Vol 51 (5) ◽  
pp. 576-582 ◽  
Author(s):  
A. A. Askadskii ◽  
V. A. Markov ◽  
A. V. Golovanov ◽  
O. V. Pakhneva ◽  
M. N. Popova ◽  
...  
Keyword(s):  
Stress Relaxation ◽  
Mechanical Behavior ◽  
Nonlinear Region

On the inference of viscoelastic constants from stress relaxation experiments

2019 ◽  
Vol 24 (1) ◽  
pp. 1-24 ◽  
Author(s):  
Kumar Vemaganti ◽  
Sandeep Madireddy ◽  
Sayali Kedari
Keyword(s):  
Stress Relaxation ◽  
Relaxation Experiments ◽  
Viscoelastic Constants

Study on Nonlinear Viscoelastic Properties of Asphalt Mixture Based on Stress Relaxation Test

2014 ◽  
Vol 563 ◽  
pp. 48-52
Author(s):  
Lei Chen ◽  
Zhi Xin Yu ◽  
Wei Ping Cui ◽  
Li Juan Qin
Keyword(s):  
Stress Relaxation ◽  
Asphalt Mixture ◽  
Viscoelastic Behavior ◽  
Exponential Model ◽  
Relaxation Test ◽  
Asphalt Binders ◽  
Stress Relaxation Test ◽  
Nonlinear Viscoelastic ◽  
Low Temperature Cracking ◽  
Relaxation Experiments

Development of normal stress in the direction perpendicular to the asphalt mixture is an important feature of the nonlinear viscoelastic behavior of asphalt binders. In this paper, this phenomenon was studied with the help of stress-relaxation experiments in torsion.  Results indicate that stress relaxation test by controlling strain could be used to evaluate the stress relaxation ability of asphalt mixture. With the aging degree of asphalt mixtures increased, the low temperature cracking resistance got worse; the higher the temperature is, the faster the stress relaxed; the smaller the initial strain, the worse the stress relaxation ability also. The viscoelasticity of asphalt mixture could be simulated by exponential model fractional and the experiments well supported the modeling results.

Isothermal Stress Relaxation in Al, Alcu and A1vpd Films

1996 ◽  
Vol 436 ◽  
Author(s):  
J. P. Lokker ◽  
J. F. Jongste ◽  
G. C. A. M. Janssen ◽  
S. Radelaar
Keyword(s):  
Stress Relaxation ◽  
Integrated Circuits ◽  
Tensile Stress ◽  
Thermal Cycling ◽  
Mechanical Behavior ◽  
Mechanical Stress ◽  
Plasma Etching ◽  
Isothermal Treatment ◽  
Aluminum Metallization ◽  
Curvature Measurements

AbstractMechanical stress and its relaxation in aluminum metallization in integrated circuits (IC) are a major concern for the reliability of the material. It is known that adding Cu improves the reliability but complicates plasma etching and increases corrosion sensitivity. The mechanical behavior of AlVPd, AlCu and Al blanket films is investigated by wafer curvature measurements. During thermal cycling between 50°C and 400°C the highest tensile stress is found in AlVPd. In a subsequent experiment, the cooling was interrupted at several temperatures to investigate the stress behavior during an eight hour isothermal treatment. Isothermal stress relaxation has been observed in the three types of films and is discussed.

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