Method and apparatus for determining the shear modulus and mechanical loss factor of polymeric specimens in uniaxial tension

1975 ◽  
Vol 9 (1) ◽  
pp. 160-162
Author(s):  
V. N. Manin ◽  
V. A. Bykov ◽  
T. Dzhaborov
Keyword(s):  
Shear Modulus ◽  
Uniaxial Tension ◽  
Loss Factor ◽  
Mechanical Loss ◽  
Mechanical Loss Factor

Rheological Behaviors of Graphene Oxide/Polyacrylonitrile Spinning Solutions

2017 ◽  
Vol 898 ◽  
pp. 2187-2196 ◽  
Author(s):  
Feng Mei Li ◽  
Ying Ying Zheng ◽  
Biao Wang
Keyword(s):  
Activation Energy ◽  
Graphene Oxide ◽  
Loss Factor ◽  
Viscosity Index ◽  
Structural Viscosity ◽  
Mechanical Loss ◽  
Flow Activation Energy ◽  
Rheological Behaviors ◽  
Flow Activation ◽  
Mechanical Loss Factor

The rheological behaviors of polyacrylonitrile (PAN) in NaSCN aqueous solutions containing different amount of Graphene oxide (GO) were investigated through both steady-state and dynamic rheological measurements. The parameters such as apparent viscosity (ηα), flow activation energy (Eη), structural viscosity index (Δη), storage modulus (G’), loss modulus (G’’) and mechanical loss factor (tanδ) were measured to illustrate the rheological behaviors of these solutions. The results showed that the apparent viscosity decreased with adding appropriate amount of GO, while the structural viscosity index, the flow activation energy and the mechanical loss factor of GO/PAN spinning solutions increased. Accordingly, a possible mechanism of GO effect on rheological behaviors of PAN solution was proposed in this work.

THE INFLUENCE OF VIBRATION DAMPING MATERIALS' COMPOSITION ON THEIR MECHANICAL LOSS FACTOR

2015 ◽  
Vol 0 (10) ◽  
pp. 10-10 ◽  
Author(s):  
V.A. Sagomonova ◽  
◽  
V.I. Kislyakova ◽  
T.Yu. Tyumeneva ◽  
V.A. Bolshakov ◽  
...  
Keyword(s):  
Loss Factor ◽  
Vibration Damping ◽  
Mechanical Loss ◽  
Damping Materials ◽  
Mechanical Loss Factor

scholarly journals Embedded NiTi Wires for Improved Dynamic Thermomechanical Performance of Silicone Elastomers

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5076
Author(s):  
Umut D. Çakmak ◽  
Ingrid Graz ◽  
Richard Moser ◽  
Michael Fischlschweiger ◽  
Zoltán Major
Keyword(s):  
Thermal Conductivity ◽  
Shape Memory ◽  
Loss Factor ◽  
Niti Alloy ◽  
Viscoelastic Behavior ◽  
Thermomechanical Analysis ◽  
Mechanical Loss ◽  
Silicone Elastomers ◽  
Niti Wires ◽  
Mechanical Loss Factor

The extraordinary properties of shape memory NiTi alloy are combined with the inherent viscoelastic behavior of a silicon elastomer. NiTi wires are incorporated in a silicon elastomer matrix. Benefits include features as electrical/thermal conductivity, reinforcement along with enhanced damping performance and flexibility. To gain more insight of this composite, a comprehensive dynamic thermomechanical analysis is performed and the temperature- as well as frequency-dependent storage modulus and the mechanical loss factor are obtained. The analyses are realized for the composite and single components. Moreover, the models to express the examined properties and their temperature along with the frequency dependencies are also presented.

CHARACTERISATION OF THE COMPLEX SHEAR MODULUS PROPERTIES OF ELECTRO-RHEOLOGICAL FLUIDS BY THE DIRECT STIFFNESS AND MASTER CURVE TECHNIQUES

1996 ◽  
Vol 10 (23n24) ◽  
pp. 3227-3236 ◽  
Author(s):  
S O Oyadiji
Keyword(s):  
Field Strength ◽  
Shear Modulus ◽  
Electric Field ◽  
Electric Field Strength ◽  
Loss Factor ◽  
Master Curve ◽  
Measured Temperature ◽  
Direct Stiffness ◽  
Er Fluid ◽  
Field Strengths

The direct stiffness technique was employed to characterise the complex modulus properties of a silicone oil-based electrorheological fluid over a frequency range from 30Hz to 300Hz and a temperature range from 0°C to 60ºC. The ER fluid device utilised was a set of concentric cylinders possessing a radial gap of 3mm between adjacent cylinders. Electric field strengths of between 0kV/mm and 2kV/mm were applied across the ER fluid. The results show that the shear modulus of the ER fluid decreased monotonically as the temperature was increased from 0ºC to 60ºC. Overall, the shear modulus decreased by a factor of up to 20. On the other hand, the shear loss factor increased from a low value of about 0.05 at 0ºC to a high value of about 1.0 at 60ºC. Conversely, as the electric field strength was increased from 0kV/mm to 2kV/mm, the shear modulus increased whereas the loss factor decreased. At all temperatures and electric field strengths of these investigations, both the shear modulus and loss factor increased in value as the excitation frequency was increased. The sets of measured temperature- and frequency-dependent data were converted, using the master curve technique, to master curves of shear modulus and loss factor which vary with frequency over several decades at a constant reference temperature and for varying levels of the electric field strength.

Determination of the dynamic shear modulus and loss factor of rubber

1980 ◽  
Vol 67 (S1) ◽  
pp. S24-S24
Author(s):  
G. Gaunaurd ◽  
K. P. Scharnhorst ◽  
H. Überall
Keyword(s):  
Shear Modulus ◽  
Loss Factor ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear
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