The Effects of Strain and Temperature on the Dynamic Properties of Elastomers

1980 ◽  
Vol 102 (1) ◽  
pp. 45-53
Author(s):  
M. S. Darlow ◽  
A. J. Smalley
Keyword(s):  
Temperature Distribution ◽  
Ambient Temperature ◽  
Dynamic Properties ◽  
Test Method ◽  
The Self ◽  
Elastic Model ◽  
Strain Sensitivity ◽  
Heating Effect ◽  
Base Excitation ◽  
Self Heating

This paper presents the results of a program of analysis and tests to determine the dynamic, properties of elastomers as a function of strain and ambient temperature. Measurements were also made to determine the temperature distribution in the elastomer samples during the tests. These measured properties were compared with analytical predictions based on a visco-elastic model designed to take into account the self-heating of the materials as a function of strain. The test method used was well-established Base Excitation Resonant Mass Technique. The specimens tested were two cylindrical button compression specimens and a shear specimen. One of the compression specimens was instrumented with thermocouples embedded in several of the elastomer samples to provide information relative to the temperature distribution in the samples. Tests were performed for strains from 0.0005 to 0.08. The ambient temperature ranged from 32°C to 80°C. Strain was shown to be an important parameter in determining the dynamic properties of the elastomers. In general, these properties were much more sensitive to strain than to frequency. The self-heating effect was found to account for a portion of the strain sensitivity of these properties.

scholarly journals Variable Surface Temperature Distribution as a Criticality Indicator of the Self-Heating Effect in Composites

2018 ◽  
Vol 18 (1) ◽  
pp. 5-12 ◽  
Author(s):  
A. Katunin
Keyword(s):  
Temperature Distribution ◽  
Surface Temperature ◽  
Heating Temperature ◽  
Measurement Techniques ◽  
Critical Value ◽  
The Self ◽  
Heating Effect ◽  
Self Heating ◽  
Surface Temperature Distribution ◽  
Variable Surface

AbstractSince self-heating effect may significantly intensify structural degradation, it is essential to investigate its criticality, i.e. the temperature value at which fatigue fracture is initiated. In this paper, a new and sensitive criticality indicator based on evaluation of evolution of surface temperature distribution was proposed and experimentally validated. It was shown that comparing to other measurement techniques the presented approach allows for precise evaluation of the critical value of the self-heating temperature. The properly determined critical value may be helpful both during design and operation of elements made of polymers and polymeric composite.

scholarly journals Influence of Self-Heating Effect on I-V Dates of Party Depleted Submicron Silicon-on-Insulator CMOS Transistors at High Ambient Temperatures

2019 ◽  
Vol 9 (1) ◽  
pp. 1446-1450
Keyword(s):  
High Temperature ◽  
Ambient Temperature ◽  
Silicon On Insulator ◽  
The Self ◽  
Heating Effect ◽  
Self Heating ◽  
Cmos Transistors ◽  
Cmos Transistor ◽  
Supply Voltages ◽  
Soi Cmos

To solve the problems of high temperature microelectronics the influence of the self heating effect on the IV dates partially depleted submicron silicon–on-insulator CMOS transistor in the ambient temperature range from 525 K to 650 K is discussed. Approach consists in combination of experimental data and of computational simulating results. For simulation of electrothermal characteristics of SOI CMOS transistor is considered three-layered structure. Temperature distribution is calculated numerically using iterative algorithm in conjunction with software COMSOL Multiphysics. I-V dates of SOI CMOS transistors are calculated by means of two-dimensional models for n-and p-channel transistors of Sentaurus TCAD developed in the system of instrument and technological modelling. TCAD models are calibrated on experimental characteristics for 525 K. It is shown that with growth of ambient temperature the selfheating mechanism contribution consistently decreases. By results of modeling it is established that self-heating contributions at supply voltages 5.5 V to decreases for ntransistor in 2.8 times, p-transistor in 2.2 times. The relative decline of current n-type transistor for reduced from 11.6% to 5.5% and for p-type with 15% to 9%. However, different dynamics of current recession for n-and p-transistors is significant for analog applications that need to be considered at high-temperature circuit design. The proposed methodology allows to critically assess the contribution of the self-heating mechanism on the I-V dates for a wide range of high temperatures and supply voltages. Underestimating this fact leads to unreasonable values for the maximum temperature and limit of thermal stability for the separate SOI CMOS transistor. In total this can be a prerequisite for a significant simplification of the design of not only the chip construction but also the whole electronic Board.

scholarly journals Criticality of the Self-Heating Effect in Polymers and Polymer Matrix Composites during Fatigue, and Their Application in Non-Destructive Testing

Polymers ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 19 ◽  
Author(s):  
Andrzej Katunin
Keyword(s):  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
The Self ◽  
Matrix Composites ◽  
Heating Effect ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Structural Degradation ◽  
Self Heating ◽  
Non Destructive

The self-heating effect is a dangerous phenomenon that occurs in polymers and polymer matrix composites during their cyclic loading, and may significantly influence structural degradation and durability as a consequence. Therefore, an analysis of its criticality is highly demanding, due to the wide occurrence of this effect, both in laboratory fatigue tests, as well as in engineering practice. In order to overcome the problem of the accelerated degradation of polymer matrix structures, it is essential to evaluate the characteristic temperature values of self-heating, which are critical from the point of view of the fatigue life of these structures, i.e., the temperature at which damage initiates, and the safe temperature range in which these structures can be safely maintained. The experimental studies performed were focused on the determination of the critical self-heating temperature, using various approaches and measurement techniques. This paper present an overview of the research studies performed in the field of structural degradation, due to self-heating, and summarizes the studies performed on the evaluation of the criticality of the self-heating effect. Moreover, the non-destructive testing method, which uses the self-heating effect as a thermal excitation source, is discussed, and the non-destructivity of this method is confirmed by experimental results.

Effect of minerals on the self-heating retorting of oil shale: Self-heating effect and shale-oil production

Fuel ◽  
2014 ◽  
Vol 118 ◽  
pp. 186-193 ◽  
Author(s):  
Hongfan Guo ◽  
Jiadong Lin ◽  
Yindong Yang ◽  
Yunyi Liu
Keyword(s):  
Oil Shale ◽  
Oil Production ◽  
The Self ◽  
Shale Oil ◽  
Heating Effect ◽  
Self Heating

Numerical analysis of the self-heating effect in SGOI with a double step buried oxide

2011 ◽  
Vol 32 (3) ◽  
pp. 034001 ◽  
Author(s):  
Bin Li ◽  
Hongxia Liu ◽  
Jin Li ◽  
Bo Yuan ◽  
Lei Cao
Keyword(s):  
Numerical Analysis ◽  
The Self ◽  
Heating Effect ◽  
Double Step ◽  
Self Heating ◽  
Buried Oxide
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