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A method of determining the shear modulus and Poisson's ratio of polymer materials

โœ Scribed by C. M. Migwi; M. I. Darby; G. H. Wostenholm; B. Yates; M. Moss; R. Duffy

Publisher
Springer
Year
1994
Tongue
English
Weight
242 KB
Volume
29
Category
Article
ISSN
0022-2461

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โœฆ Synopsis

An experimental method is described which allows the shear modulus and Poisson's ratio of a polymer material to be determined as functions of temperature. Using commercial thermal mechanical analysis equipment, measurements are required of the thermal expansion coefficients of both unconstrained and constrained specimens, and of the Young's modulus. The constraint on a small disc-shaped polymer specimen is applied by a copper annulus. The basis of the method is that the apparent thermal expansion of the constrained specimen depends on the Poisson effect, and an analysis is given which enbles the Poisson's ratio to be determined. Some illustrative results are presented for a silicon rubber.

๐Ÿ“œ SIMILAR VOLUMES

The bulk modulus and Poisson's ratio of
The bulk modulus and Poisson's ratio of โ€œincompressibleโ€ materials
โœ P.H. Mott; J.R. Dorgan; C.M. Roland ๐Ÿ“‚ Article ๐Ÿ“… 2008 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 127 KB

Poisson's ratio, n, is a fundamental parameter characterizing the mechanical behavior of a material. Because the ratio of the bulk to the shear modulus, B/G, becomes infinite when n ยผ 1=2, it is often assumed that the bulk modulus becomes very large as a material approaches ''incompressibility.'' Th