On the use of stretched-exponential functions for both linear viscoelastic creep and stress relaxation

1997 ◽  
Vol 36 (3) ◽  
pp. 320-329 ◽  
Author(s):  
Guy C. Berry ◽  
Donald J. Plazek
Keyword(s):  
Stress Relaxation ◽  
Exponential Functions ◽  
Viscoelastic Creep ◽  
Stretched Exponential ◽  
Linear Viscoelastic ◽  
Creep And Stress Relaxation

Indentation Creep and Relaxation Measurements of Polymers

2004 ◽  
Vol 841 ◽  
Author(s):  
Mark R. VanLandingham ◽  
Peter L. Drzal ◽  
Christopher C. White
Keyword(s):  
Stress Relaxation ◽  
Mechanical Response ◽  
Creep Compliance ◽  
Relaxation Modulus ◽  
Polymeric Materials ◽  
Indentation Creep ◽  
Dimethyl Siloxane ◽  
Linear Viscoelastic Material ◽  
Linear Viscoelastic ◽  
Creep And Stress Relaxation

ABSTRACTInstrumented indentation was used to characterize the mechanical response of polymeric materials. A model based on contact between a rigid probe and a linear viscoelastic material was used to calculate values for creep compliance and stress relaxation modulus for epoxy, poly(methyl methacrylate) (PMMA), and two poly(dimethyl siloxane) (PDMS) elastomers. Results from bulk rheometry studies were used for comparison to the indentation creep and stress relaxation results. For the two glassy polymers, the use of sharp pyramidal tips produced responses that were considerably more compliant (less stiff) than rheometry values. Additional study of the deformation remaining in epoxy after creep testing revealed that a large portion of the creep displacement measured was due to post-yield flow. Indentation creep measurements of the epoxy using a rounded conical tip also produced nonlinear responses, but the creep compliance values appeared to approach linear viscoelastic values with decreasing creep force. Responses measured for the PDMS were mainly linear elastic, but the filled PDMS exhibited some time-dependence and nonlinearity in both rheometry and indentation measurements.

Early age creep and stress relaxation of concrete containing blended cements

10.1617/13800 ◽  
2002 ◽  
Vol 35 (246) ◽  
pp. 92-96 ◽  
Author(s):  
I. Pane
Keyword(s):  
Stress Relaxation ◽  
Early Age ◽  
Blended Cements ◽  
Creep And Stress Relaxation

DEM study of creep and stress relaxation behaviors of dense sand

2021 ◽  
Vol 134 ◽  
pp. 104142
Author(s):  
Jianfeng Wang ◽  
Zhangqi Xia
Keyword(s):  
Stress Relaxation ◽  
Dense Sand ◽  
Creep And Stress Relaxation

Unsteady creep and stress relaxation of AK4-1 alloy in the probability aspect

1975 ◽  
Vol 7 (1) ◽  
pp. 27-31
Author(s):  
S. P. Borisov ◽  
N. I. Borshchev ◽  
M. N. Stepnov ◽  
I. I. Khazanov
Keyword(s):  
Stress Relaxation ◽  
Unsteady Creep ◽  
Creep And Stress Relaxation

STRESS RELAXATION OF MAGNETORHEOLOGICAL FLUIDS

2002 ◽  
Vol 16 (17n18) ◽  
pp. 2655-2661
Author(s):  
W. H. LI ◽  
G. CHEN ◽  
S. H. YEO ◽  
H. DU
Keyword(s):  
Stress Relaxation ◽  
Viscoelastic Model ◽  
Relaxation Modulus ◽  
Damping Function ◽  
Mr Fluids ◽  
Large Step ◽  
Linear Viscoelastic ◽  
Predicted Values ◽  
Two Parameters ◽  
Step Strain

In this paper, the experimental and modeling study and analysis of the stress relaxation characteristics of magnetorheological (MR) fluids under step shear are presented. The experiments are carried out using a rheometer with parallel-plate geometry. The applied strain varies from 0.01% to 100%, covering both the pre-yield and post-yield regimes. The effects of step strain, field strength, and temperature on the stress modulus are addressed. For small step strain ranges, the stress relaxation modulus G(t,γ) is independent of step strain, where MR fluids behave as linear viscoelastic solids. For large step strain ranges, the stress relaxation modulus decreases gradually with increasing step strain. Morever, the stress relaxation modulus G(t,γ) was found to obey time-strain factorability. That is, G(t,γ) can be represented as the product of a linear stress relaxation G(t) and a strain-dependent damping function h(γ). The linear stress relaxation modulus is represented as a three-parameter solid viscoelastic model, and the damping function h(γ) has a sigmoidal form with two parameters. The comparison between the experimental results and the model-predicted values indicates that this model can accurately describe the relaxation behavior of MR fluids under step strains.

Relationship between constant-load creep, decreasing-load creep and stress relaxation of titanium alloy

2015 ◽  
Vol 638 ◽  
pp. 106-113 ◽  
Author(s):  
Po Liu ◽  
Yingying Zong ◽  
Debin Shan ◽  
Bin Guo
Keyword(s):  
Titanium Alloy ◽  
Stress Relaxation ◽  
Constant Load ◽  
Creep And Stress Relaxation

Experimental Compaction and Dilation of Porous Rocks During Triaxial Creep and Stress Relaxation

2021 ◽  
Author(s):  
Alina Sabitova ◽  
Viktoriya M. Yarushina ◽  
Sergey Stanchits ◽  
Vladimir Stukachev ◽  
Lyudmila Khakimova ◽  
...  
Keyword(s):  
Stress Relaxation ◽  
Porous Rocks ◽  
Triaxial Creep ◽  
Creep And Stress Relaxation
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