Investigation of the Payne Effect and its Temperature Dependence on Silica-Filled Polydimethylsiloxane Networks. Part II: Test of Quantitative Models

2005 ◽  
Vol 78 (2) ◽  
pp. 232-244 ◽  
Author(s):  
F. Clément ◽  
L. Bokobza ◽  
L. Monnerie
Keyword(s):  
Temperature Dependence ◽  
Volume Fraction ◽  
Variable Temperature ◽  
Experimental Results ◽  
Influence Of Temperature ◽  
Payne Effect ◽  
Quantitative Models ◽  
Filler Volume Fraction ◽  
Influence Of Temperature On

Abstract The results obtained in Part I, on Polydimethylsiloxane (PDMS) networks filled with treated Aerosil A300 silica at variable temperature and various loadings, have been used to test the quantitative models of the Payne effect proposed by Kraus, Huber-Vilgis, and Maier-Göritz. Each model is able to account only for a part of the experimental results: Kraus and Maier-Vilgis for the variation of the Payne effect with filler volume fraction, Maier-Göritz for the influence of temperature on the Payne effect. But neither of these quantitative models is able to fit the whole set of experimental results on G′ and G″ with a unique set of parameters.

Investigation of the Payne Effect and its Temperature Dependence on Silica-Filled Polydimethylsiloxane Networks. Part I: Experimental Results

2005 ◽  
Vol 78 (2) ◽  
pp. 211-231 ◽  
Author(s):  
F. Clément ◽  
L. Bokobza ◽  
L. Monnerie
Keyword(s):  
Elastic Modulus ◽  
Surface Treatment ◽  
Temperature Dependence ◽  
Shear Strain ◽  
Variable Temperature ◽  
Silica Particles ◽  
Experimental Results ◽  
Payne Effect ◽  
Low Shear

Abstract The Payne effect is studied in silica-filled polydimethylsiloxane networks, containing various silica loadings and at variable temperature. The effect of a permanent surface treatment of the silica particles, as well as the influence of the incorporation in the system of a processing aid agent, have been investigated. The amplitude of the Payne effect is reduced by introducing a permanent treatment of the silica or a processing aid. Contrary to the unfilled network which shows the typical entropic dependence of the elastic modulus, the low shear strain elastic modulus of filled networks decreases when temperature increases. When the shear strain increases, this temperature dependence becomes less and less pronounced, and reaches a plateau value at deformations above 100%.

Influence of Temperature on the Densification and Lattice Parameters of Sialon Ceramic

2011 ◽  
Vol 335-336 ◽  
pp. 678-682
Author(s):  
Zhu Xing Tang ◽  
He Zhang ◽  
Hui Hui Tan ◽  
Xia Zhao
Keyword(s):  
Temperature Rise ◽  
Sintering Temperature ◽  
Lattice Parameters ◽  
Experimental Results ◽  
Sintering Behavior ◽  
Influence Of Temperature ◽  
Sialon Ceramic ◽  
Sintering Additive ◽  
Influence Of Temperature On ◽  
Z Value

The sintering behavior and lattice parameters of β-sialon were investigated by varying temperature, z values and the amounts of sintering additive composed of Y2O3. The experimental results indicated that the z value of β-sialon decreases with the sintering temperature increases. The sinterability of the β-sialon declined with the z values increase . As the sintering temperature rise the phenomenon of anti-densification was occurred when the amount of additive was 7wt%.

scholarly journals Temperature dependence of the indentation size effect

2010 ◽  
Vol 25 (7) ◽  
pp. 1225-1229 ◽  
Author(s):  
Oliver Franke ◽  
Jonathan C. Trenkle ◽  
Christopher A. Schuh
Keyword(s):  
High Temperature ◽  
Size Effect ◽  
Temperature Dependence ◽  
Thermal Activation ◽  
Indentation Size Effect ◽  
Inert Atmosphere ◽  
Length Scale ◽  
Indentation Size ◽  
Influence Of Temperature ◽  
Influence Of Temperature On

The influence of temperature on the indentation size effect is explored experimentally. Copper is indented on a custom-built high-temperature nanoindenter at temperatures between ambient and 200 °C, in an inert atmosphere that precludes oxidation. Over this range of temperatures, the size effect is reduced considerably, suggesting that thermal activation plays a major role in determining the length scale for plasticity.

Influence of temperature on electrical conductivity on shaly sands

Geophysics ◽  
1992 ◽  
Vol 57 (1) ◽  
pp. 89-96 ◽  
Author(s):  
Pabitra N. Sen ◽  
Peter A. Goode
Keyword(s):  
Electrical Conductivity ◽  
Temperature Dependence ◽  
Pore Space ◽  
Clay Content ◽  
Large Temperature ◽  
Measured Temperature ◽  
Water Conductivity ◽  
Influence Of Temperature ◽  
Counter Ions ◽  
Influence Of Temperature On

In boreholes, temperatures vary and to extract hydrocarbon saturation from conductivity measurements, the influence of temperature on water and rock conductivities must be accounted for. The mobility [Formula: see text] of the counter‐ions due to clays and the electrical conductivity of pore‐filling brine show large changes with variation in temperature, whereas the microgeometry of the pore space exhibits negligible change. Using this idea, the temperature dependence of [Formula: see text] is extracted using data on dc electrical conductivity of shaly sands (σ) containing varying amounts of clay. The mobility of [Formula: see text] counter‐ions is found to vary approximately linearly with temperature. This explicit relationship is tested by comparing the predicted temperature dependence against the measured temperature dependence of conductivity of a set of rocks with high and low clay content. While the rock conductivity shows a large temperature dependence, the resistivity index is less sensitive to temperature. An approximate formula, which is superior to Arps’s formula, for water conductivity as a function of temperature is obtained.

Heat-Transfer Mechanism of Sample-Probe in Variable-Temperature Scanning Probe Microscope and Influence of Temperature on Tunneling Current

2007 ◽  
Vol 121-123 ◽  
pp. 673-676
Author(s):  
Jing Wang ◽  
Hong Qi Li ◽  
Mei Hua Liu ◽  
Zhi Guo Zheng ◽  
Lin'an Li
Keyword(s):  
Heat Transfer ◽  
Variable Temperature ◽  
New Technology ◽  
Tunneling Current ◽  
Heat Current ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Limited Temperature Range ◽  
Temperature Scanning ◽  
And Control

The macroscopical breakage and nature change of material usually originate in nanometer scale, and the nature of some materials depends on temperature strongly. So it is extremely important for the research of heat transfer in micro-scale and nanometer technology to understand and control the influence of temperature on the nature of material, and developing advanced measuring technique can also improve our knowledge on theories involved in such problem. Due to the usage of variable-temperature sample stage, utilizable range of temperature is widely extended, and thus topography images of materials changing with temperature can be observed so that the thermal properties of materials can be studied further. Accordingly, the theoretical basis of heat-transfer and the influence of temperature on tunneling current owing to temperature variation should be presented. In the view of microscale heat-transfer, this paper describes the problem that heat current transfers from surface of sample to tip of probe through layer of air by means of Boltzmann theory, which can be expressed by the hyperbolic equation of heat conduction when the time is nearly equivalent to slack time and the scale is much larger than the characteristic scale of local thermodynamic equilibrium. The mode of heat-transfer on probe is also analyzed and the analytical solution is obtained in the paper. In addition, the influence of temperature increment of sample on tunneling current is discussed in detail and the change trend of tunneling current with temperature is also obtained in a limited temperature range. Due to such factors, which are possible to disturb the topography images of sample, there is no doubt that many difficulties will be brought to developing new technology such as detecting displacement and strain of materials at microscale by using the images of sample heated and unheated. To understand and control such factors has important advantage for making progress in the advanced scientific fields.

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