Closure to “Discussion of ‘An Experimental Method for Determining Poisson’s Ratio of Elastomers’” (1970, ASME J. Lubr. Technol., 92, pp. 386–387)

1970 ◽  
Vol 92 (3) ◽  
pp. 387-388
Author(s):  
Glenn K. Rightmire
Keyword(s):  
Experimental Method ◽  
Poisson’S Ratio ◽  
Poisson's Ratio

An Experimental Method for Determining Poisson’s Ratio of Elastomers

1970 ◽  
Vol 92 (3) ◽  
pp. 381-386 ◽  
Author(s):  
Glenn K. Rightmire
Keyword(s):  
Experimental Method ◽  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Compliant Surface ◽  
Typical Data ◽  
Load Carrying ◽  
The Common ◽  
Significant Figures ◽  
Sensitive Parameters ◽  
Better Than

One of the most important and sensitive parameters defining the characteristic behavior of compliant-surface, fluid-film bearings has been found to be the value of Poisson’s ratio of the elastomer material—a 1 percent variation in ν in the range of common values produces about a 25 percent change in load carrying capacity. Since values of Poisson’s ratio for the common elastomers are unknown with any degree of accuracy, an experimental method has been devised to measure Poisson’s ratio for typical cases to better than four significant figures. This paper describes the method together with an error analysis and typical data from elastomeric samples.

An Experimental Method to Determine Poisson’s Ratio in a Small Beam Subject to Seismic Excitation

1997 ◽  
Author(s):  
Roberto Caracciolo ◽  
Alessandro Gasparetto ◽  
Marco Giovagnoni
Keyword(s):  
Experimental Method ◽  
Poisson’S Ratio ◽  
Iterative Procedure ◽  
Master Curve ◽  
Seismic Excitation ◽  
Poisson's Ratio ◽  
Strain Gauges ◽  
Frequency Range ◽  
Different Temperatures ◽  
Transverse Strains

Abstract An experimental method to determine Poisson’s ratio in a small beam subject to seismic excitation is presented. Poisson’s ratio is computed by measuring longitudinal and transverse strains by means of electric strain gauges. A first set of tests is carried out with different materials, and it is observed that the measured Poisson’s ratio decreases with frequency. However, to determine whether the observed decrease is true or it is due to an error caused by the plate effect of the beam, a second set of tests at different temperatures is carried out. Then, by applying the reduced variables method, a unique plot for Poisson’s ratio on a much broader frequency range is obtained, which allows to state that the decrease of Poisson’s ratio is true. An iterative procedure is described, which has been developed to gather the curves at different temperatures in a master curve.

Effect of Carbon Black on Poisson's Ratio of Elastomers

1975 ◽  
Vol 48 (2) ◽  
pp. 246-253 ◽  
Author(s):  
B. P. Holownia
Keyword(s):  
Carbon Black ◽  
Bulk Modulus ◽  
Experimental Method ◽  
Young’S Modulus ◽  
Poisson’S Ratio ◽  
Young's Modulus ◽  
Poisson's Ratio ◽  
Carbon Black Content ◽  
Practical Applications ◽  
Incompressible Materials

Abstract The experimental method developed is mostly suitable for measuring K of relatively incompressible materials such as members of the elastomer family. The accuracy of K values are estimated to be within ±3% for all rubber specimens. Its use can be extended to plastics with somewhat reduced accuracy. The results show that bulk modulus K for the four different rubbers tested increases almost linearly with carbon black content while the Young's modulus E increases much more rapidly as shown in Figure 3. It is interesting to note that Poisson's ratio v calculated using K and E does not fall below 0.4940 (Figure 5), and the value of v=0.4997 as quoted in engineering handbooks would be reasonable to use for most practical applications where the carbon black content is not excessive.

The Model for Calculating Elastic Modulus and Poisson's Ratio of Coal Body

2013 ◽  
Vol 6 (1) ◽  
pp. 36-43 ◽  
Author(s):  
Ai Chi ◽  
Li Yuwei
Keyword(s):  
Elastic Modulus ◽  
Poisson’S Ratio ◽  
Fractured Rock ◽  
Rock Block ◽  
Poisson's Ratio ◽  
Linear Elastic ◽  
Study Results ◽  
The Face ◽  
Block Face ◽  
Coal Rock

Coal body is a type of fractured rock mass in which lots of cleat fractures developed. Its mechanical properties vary with the parametric variation of coal rock block, face cleat and butt cleat. Based on the linear elastic theory and displacement equivalent principle and simplifying the face cleat and butt cleat as multi-bank penetrating and intermittent cracks, the model was established to calculate the elastic modulus and Poisson's ratio of coal body combined with cleat. By analyzing the model, it also obtained the influence of the parameter variation of coal rock block, face cleat and butt cleat on the elastic modulus and Poisson's ratio of the coal body. Study results showed that the connectivity rate of butt cleat and the distance between face cleats had a weak influence on elastic modulus of coal body. When the inclination of face cleat was 90°, the elastic modulus of coal body reached the maximal value and it equaled to the elastic modulus of coal rock block. When the inclination of face cleat was 0°, the elastic modulus of coal body was exclusively dependent on the elastic modulus of coal rock block, the normal stiffness of face cleat and the distance between them. When the distance between butt cleats or the connectivity rate of butt cleat was fixed, the Poisson's ratio of the coal body initially increased and then decreased with increasing of the face cleat inclination.

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